diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1fc312f..e5386fe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,9 @@ set(OPENFPGALOADER_SOURCE
 	src/svf_jtag.cpp
 	src/jedParser.cpp
 	src/display.cpp
-	src/ftdijtag.cpp
+	src/jtag.cpp
+	src/ftdiJtagBitbang.cpp
+	src/ftdiJtagMPSSE.cpp
 	src/configBitstreamParser.cpp
 	src/ftdipp_mpsse.cpp
 	src/xilinx.cpp
@@ -46,7 +48,10 @@ set(OPENFPGALOADER_HEADERS
 	src/altera.hpp
 	src/progressBar.hpp
 	src/bitparser.hpp
-	src/ftdijtag.hpp
+	src/ftdiJtagBitbang.hpp
+	src/ftdiJtagMPSSE.hpp
+	src/jtag.hpp
+	src/jtagInterface.hpp
 	src/fsparser.hpp
 	src/part.hpp
 	src/board.hpp
diff --git a/src/altera.cpp b/src/altera.cpp
index 1cea967..438c54d 100644
--- a/src/altera.cpp
+++ b/src/altera.cpp
@@ -1,5 +1,6 @@
+#include <string.h>
 #include "altera.hpp"
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "device.hpp"
 #include "epcq.hpp"
 
@@ -8,7 +9,7 @@
 // DATA_DIR is defined at compile time.
 #define BIT_FOR_FLASH (DATA_DIR "/openFPGALoader/test_sfl.svf")
 
-Altera::Altera(FtdiJtag *jtag, std::string filename, bool verbose):
+Altera::Altera(Jtag *jtag, std::string filename, bool verbose):
 	Device(jtag, filename, verbose), _svf(_jtag, _verbose)
 {
 	if (_filename != "") {
@@ -24,10 +25,10 @@ void Altera::reset()
 {
 	/* PULSE_NCONFIG */
 	unsigned char tx_buff[2] = {0x01, 0x00};
-	_jtag->set_state(FtdiJtag::TEST_LOGIC_RESET);
+	_jtag->set_state(Jtag::TEST_LOGIC_RESET);
 	_jtag->shiftIR(tx_buff, NULL, IRLENGTH);
 	_jtag->toggleClk(1);
-	_jtag->set_state(FtdiJtag::TEST_LOGIC_RESET);
+	_jtag->set_state(Jtag::TEST_LOGIC_RESET);
 }
 
 void Altera::program(unsigned int offset)
@@ -45,7 +46,7 @@ void Altera::program(unsigned int offset)
 		_svf.parse(_filename);
 	} else if (_mode == Device::SPI_MODE) {
 		/* GGM: TODO: fix this issue */
-		EPCQ epcq(_jtag->vid(), _jtag->pid(), 2, 6000000);
+		EPCQ epcq(0x403, 0x6010/*_jtag->vid(), _jtag->pid()*/, 2, 6000000);
 		_svf.parse(BIT_FOR_FLASH);
 		epcq.program(offset, _filename, (_file_extension == "rpd")? true:false);
 		reset();
@@ -53,11 +54,12 @@ void Altera::program(unsigned int offset)
 }
 int Altera::idCode()
 {
-	unsigned char tx_data = IDCODE;
+	unsigned char tx_data[4] = {IDCODE};
 	unsigned char rx_data[4];
 	_jtag->go_test_logic_reset();
-	_jtag->shiftIR(&tx_data, NULL, IRLENGTH);
-	_jtag->shiftDR(NULL, rx_data, 32);
+	_jtag->shiftIR(tx_data, NULL, IRLENGTH);
+	bzero(tx_data, 4);
+	_jtag->shiftDR(tx_data, rx_data, 32);
 	return ((rx_data[0] & 0x000000ff) |
 		((rx_data[1] << 8) & 0x0000ff00) |
 		((rx_data[2] << 16) & 0x00ff0000) |
diff --git a/src/altera.hpp b/src/altera.hpp
index 22127a8..0cfa913 100644
--- a/src/altera.hpp
+++ b/src/altera.hpp
@@ -3,12 +3,12 @@
 
 #include "bitparser.hpp"
 #include "device.hpp"
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "svf_jtag.hpp"
 
 class Altera: public Device {
 	public:
-		Altera(FtdiJtag *jtag, std::string filename, bool verbose);
+		Altera(Jtag *jtag, std::string filename, bool verbose);
 		~Altera();
 
 		void program(unsigned int offset = 0);
diff --git a/src/board.hpp b/src/board.hpp
index 186d89c..492e93f 100644
--- a/src/board.hpp
+++ b/src/board.hpp
@@ -3,16 +3,51 @@
 
 #include <map>
 
-static std::map <std::string, std::string > board_list = {
-	{"arty",    "digilent"},
-	{"colorlight", ""},
-	{"cyc1000", "ft2232"},
-	{"de0nano", "usbblaster"},
-	{"ecp5_evn", "ft2232"},
-	{"machXO3SK", "ft2232"},
-	{"littleBee", "ft2232"},
-	{"spartanEdgeAccelBoard", ""},
-	{"tangnano", "ft2232"}
+#include "cable.hpp"
+
+/* AN_232R-01_Bit_Bang_Mode_Available_For_FT232R_and_Ft245R */
+enum {
+	FT232RL_TXD = 0,
+	FT232RL_RXD = 1,
+	FT232RL_RTS = 2,
+	FT232RL_CTS = 3,
+	FT232RL_DTR = 4,
+	FT232RL_DSR = 5,
+	FT232RL_DCD = 6,
+	FT232RL_RI  = 7
+};
+
+/*!
+ * \brief for bitbang mode this structure provide offset for each JTAG signals
+ */
+typedef struct {
+	uint8_t tms_pin; /*! TMS pin offset */
+	uint8_t tck_pin; /*! TCK pin offset */
+	uint8_t tdi_pin; /*! TDI pin offset */
+	uint8_t tdo_pin; /*! TDO pin offset */
+} jtag_pins_conf_t;
+
+/*!
+ * \brief a board has a target cable and optionnally a pin configuration
+ * (bitbang mode)
+ */
+typedef struct {
+	std::string cable_name; /*! provide name of one entry in cable_list */
+	jtag_pins_conf_t pins_config; /*! for bitbang, provide struct with pins offset */
+} target_cable_t;
+
+static std::map <std::string, target_cable_t> board_list = {
+	{"arty",       {"digilent",   {}}},
+	{"colorlight", {"",           {}}},
+	{"cyc1000",    {"ft2232",     {}}},
+	{"de0nano",    {"usbblaster", {}}},
+	{"ecp5_evn",   {"ft2232",     {}}},
+	{"machXO3SK",  {"ft2232",     {}}},
+	{"littleBee",  {"ft2232",     {}}},
+	{"spartanEdgeAccelBoard", {"",{}}},
+	{"tangnano",   {"ft2232",     {}}},
+	{"ulx2s",      {"ft232RL",  {FT232RL_RI, FT232RL_DSR, FT232RL_CTS, FT232RL_DCD}}},
+	{"ulx3s",      {"ft231X",   {FT232RL_DCD, FT232RL_DSR, FT232RL_RI, FT232RL_CTS}}}
 };
 
 #endif
diff --git a/src/cable.hpp b/src/cable.hpp
index 11f96b4..4d16d4a 100644
--- a/src/cable.hpp
+++ b/src/cable.hpp
@@ -2,16 +2,32 @@
 #define CABLE_HPP
 
 #include <map>
+#include <string>
 
 #include "ftdipp_mpsse.hpp"
 
-static std::map <std::string, FTDIpp_MPSSE::mpsse_bit_config > cable_list = {
-	{"digilent", {0x0403, 0x6010, 0xe8, 0xeb, 0x00, 0x60}},
-	{"digilent_hs2", {0x0403, 0x6014, 0xe8, 0xeb, 0x00, 0x60}},
-	{"digilent_hs3", {0x0403, 0x6014, 0x88, 0x8B, 0x20, 0x30}},
-	{"ft232",    {0x0403, 0x6014, 0x08, 0x0B, 0x08, 0x0B}},
-	{"ft2232",   {0x0403, 0x6010, 0x08, 0x0B, 0x08, 0x0B}},
-	{"ft4232",   {0x0403, 0x6011, 0x08, 0x0B, 0x08, 0x0B}},
+/*!
+ * \brief define type of communication
+ */
+enum {
+	MODE_FTDI_BITBANG = 0, /*! used with ft232RL/ft231x */
+	MODE_FTDI_SERIAL  = 1  /*! ft2232, ft232H */
+} communication_type_t;
+
+typedef struct {
+	int type;
+	FTDIpp_MPSSE::mpsse_bit_config config;
+} cable_t;
+
+static std::map <std::string, cable_t> cable_list = {
+	{"digilent",     {MODE_FTDI_SERIAL,  {0x0403, 0x6010, INTERFACE_A, 0xe8, 0xeb, 0x00, 0x60}}},
+	{"digilent_hs2", {MODE_FTDI_SERIAL,  {0x0403, 0x6014, INTERFACE_A, 0xe8, 0xeb, 0x00, 0x60}}},
+	{"digilent_hs3", {MODE_FTDI_SERIAL,  {0x0403, 0x6014, INTERFACE_A, 0x88, 0x8B, 0x20, 0x30}}},
+	{"ft2232",       {MODE_FTDI_SERIAL,  {0x0403, 0x6010, INTERFACE_A, 0x08, 0x0B, 0x08, 0x0B}}},
+	{"ft231X",       {MODE_FTDI_BITBANG, {0x0403, 0x6015, INTERFACE_A, 0x00, 0x00, 0x00, 0x00}}},
+	{"ft232",        {MODE_FTDI_SERIAL,  {0x0403, 0x6014, INTERFACE_A, 0x08, 0x0B, 0x08, 0x0B}}},
+	{"ft232RL",      {MODE_FTDI_BITBANG, {0x0403, 0x6001, INTERFACE_A, 0x08, 0x0B, 0x08, 0x0B}}},
+	{"ft4232",       {MODE_FTDI_SERIAL,  {0x0403, 0x6011, INTERFACE_A, 0x08, 0x0B, 0x08, 0x0B}}}
 };
 
 #endif
diff --git a/src/device.cpp b/src/device.cpp
index 709b1f4..599c2d8 100644
--- a/src/device.cpp
+++ b/src/device.cpp
@@ -5,7 +5,7 @@
 
 using namespace std;
 
-Device::Device(FtdiJtag *jtag, string filename, bool verbose):
+Device::Device(Jtag *jtag, string filename, bool verbose):
 		_filename(filename),
 		_file_extension(filename.substr(filename.find_last_of(".") +1)),
 		_mode(NONE_MODE), _verbose(verbose)
diff --git a/src/device.hpp b/src/device.hpp
index c425e03..b76b474 100644
--- a/src/device.hpp
+++ b/src/device.hpp
@@ -3,7 +3,7 @@
 
 #include <iostream>
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 
 /* GGM: TODO: program must have an optional
  * offset
@@ -18,13 +18,13 @@ class Device {
 			FLASH_MODE = 1,
 			MEM_MODE = 2
 		};
-		Device(FtdiJtag *jtag, std::string filename, bool verbose = false);
+		Device(Jtag *jtag, std::string filename, bool verbose = false);
 		virtual ~Device();
 		virtual void program(unsigned int offset = 0) = 0;
 		virtual int  idCode() = 0;
 		virtual void reset();
 	protected:
-		FtdiJtag *_jtag;
+		Jtag *_jtag;
 		std::string _filename;
 		std::string _file_extension;
 		enum prog_mode _mode;
diff --git a/src/ftdiJtagBitbang.cpp b/src/ftdiJtagBitbang.cpp
new file mode 100644
index 0000000..03c55ef
--- /dev/null
+++ b/src/ftdiJtagBitbang.cpp
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <libusb.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <iostream>
+#include <map>
+#include <vector>
+#include <string>
+
+#include "ftdiJtagBitbang.hpp"
+#include "ftdipp_mpsse.hpp"
+
+using namespace std;
+
+#define DEBUG 0
+
+#ifdef DEBUG
+#define display(...) \
+	do { \
+		if (_verbose) fprintf(stdout, __VA_ARGS__); \
+	}while(0)
+#else
+#define display(...) do {}while(0)
+#endif
+
+FtdiJtagBitBang::FtdiJtagBitBang(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+			const jtag_pins_conf_t *pin_conf, string dev, uint32_t clkHZ, bool verbose):
+			FTDIpp_MPSSE(cable, dev, clkHZ, verbose), _bitmode(0), _nb_bit(0)
+{
+	init_internal(cable, pin_conf);
+}
+
+FtdiJtagBitBang::FtdiJtagBitBang(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+		   const jtag_pins_conf_t *pin_conf, uint32_t clkHZ, bool verbose):
+		   FTDIpp_MPSSE(cable, clkHZ, verbose),
+		   _bitmode(0), _nb_bit(0)
+{
+	init_internal(cable, pin_conf);
+}
+
+FtdiJtagBitBang::~FtdiJtagBitBang()
+{
+	free(_in_buf);
+}
+
+void FtdiJtagBitBang::init_internal(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+		  const jtag_pins_conf_t *pin_conf)
+{
+	_tck_pin = (1 << pin_conf->tck_pin);
+	_tms_pin = (1 << pin_conf->tms_pin);
+	_tdi_pin = (1 << pin_conf->tdi_pin);
+	_tdo_pin = (1 << pin_conf->tdo_pin);
+
+	_buffer_size = 128;  // TX Fifo size
+
+	_in_buf = (unsigned char *)malloc(sizeof(unsigned char) * _buffer_size);
+	bzero(_in_buf, _buffer_size);
+	init(1, _tck_pin | _tms_pin | _tdi_pin, BITMODE_BITBANG,
+		(FTDIpp_MPSSE::mpsse_bit_config &)cable);
+	setBitmode(BITMODE_BITBANG);
+
+}
+
+int FtdiJtagBitBang::setBitmode(uint8_t mode)
+{
+	if (_bitmode == mode)
+		return 0;
+	_bitmode = mode;
+
+	int ret = ftdi_set_bitmode(_ftdi, _tck_pin | _tms_pin | _tdi_pin, _bitmode);
+	ftdi_usb_purge_rx_buffer(_ftdi);
+	ftdi_usb_purge_tx_buffer(_ftdi);
+	return ret;
+}
+
+/**
+ * store tms in
+ * internal buffer
+ */
+int FtdiJtagBitBang::storeTMS(uint8_t *tms, int nb_bit, uint8_t tdi, bool read)
+{
+	(void) read;
+	int xfer_len = nb_bit;
+	/* need to check for available space in buffer */
+	if (nb_bit == 0)
+		return 0;
+
+	while (xfer_len > 0) {
+		int xfer = xfer_len;
+		if ((_nb_bit + 2*xfer) > _buffer_size)
+			xfer = (_buffer_size - _nb_bit) >> 1;
+
+		for (int i = 0; i < xfer; i++, _nb_bit += 2) {
+			_in_buf[_nb_bit] = ((tdi)?_tdi_pin:0) |
+					(((tms[i >> 3] >> (i & 0x7)) & 0x01)? _tms_pin:0);
+			_in_buf[_nb_bit + 1] = _in_buf[_nb_bit] | _tck_pin;
+		}
+
+		xfer_len -= xfer;
+		if (xfer_len != 0)
+			write(NULL);
+	}
+	return nb_bit;
+}
+
+int FtdiJtagBitBang::writeTMS(uint8_t *tdo, int len)
+{
+	(void) len;
+	return write(tdo);
+}
+
+/**
+ * store tdi in
+ * internal buffer with tms
+ * size must be <= 8
+ */
+int FtdiJtagBitBang::storeTDI(uint8_t tdi, int nb_bit, bool read)
+{
+	for (int i = 0; i < nb_bit; i++, _nb_bit += 2) {
+		_in_buf[_nb_bit] =
+				((tdi & (1 << (i & 0x7)))?_tdi_pin:0);
+		_in_buf[_nb_bit + 1] = _in_buf[_nb_bit] | _tck_pin;
+	}
+	return nb_bit;
+}
+
+/**
+ * store tdi in
+ * internal buffer
+ * since TDI is used in shiftDR and shiftIR, tms is always set to 0
+ */
+int FtdiJtagBitBang::storeTDI(uint8_t *tdi, int nb_byte, bool read)
+{
+	/* need to check for available space in buffer */
+	for (int i = 0; i < nb_byte * 8; i++, _nb_bit += 2) {
+		_in_buf[_nb_bit] =
+				((tdi[i >> 3] & (1 << (i & 0x7)))?_tdi_pin:0);
+		_in_buf[_nb_bit + 1] = _in_buf[_nb_bit] | _tck_pin;
+	}
+	return nb_byte;
+}
+
+int FtdiJtagBitBang::writeTDI(uint8_t *tdo, int nb_bit)
+{
+	(void) nb_bit;
+	return write(tdo);
+}
+
+
+int FtdiJtagBitBang::write(uint8_t *tdo)
+{
+	int ret = 0;
+	if (_nb_bit == 0)
+		return 0;
+
+	setBitmode((tdo) ? BITMODE_SYNCBB : BITMODE_BITBANG);
+
+	ret = ftdi_write_data(_ftdi, _in_buf, _nb_bit);
+	if (ret != _nb_bit)
+		printf("problem %d written\n", ret);
+
+	if (tdo) {
+		ret = ftdi_read_data(_ftdi, _in_buf, _nb_bit);
+		if (ret != _nb_bit)
+			printf("problem %d read\n", ret);
+		/* need to reconstruct received word 
+		 * even bit are discarded since JTAG read in rising edge
+		 * since jtag is LSB first we need to shift right content by 1
+		 * and add 0x80 (1 << 7) or 0
+		 * */
+		for (int i = 1, offset=0; i < _nb_bit; i+=2, offset++) {
+			tdo[offset >> 3] = (((_in_buf[i] & _tdo_pin) ? 0x80 : 0x00) |
+							(tdo[offset >> 3] >> 1));
+		}
+	}
+	_nb_bit = 0;
+	return ret;
+}
diff --git a/src/ftdiJtagBitbang.hpp b/src/ftdiJtagBitbang.hpp
new file mode 100644
index 0000000..41ff9d2
--- /dev/null
+++ b/src/ftdiJtagBitbang.hpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef FTDIJTAGBITBANG_H
+#define FTDIJTAGBITBANG_H
+#include <ftdi.h>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "board.hpp"
+#include "jtagInterface.hpp"
+#include "ftdipp_mpsse.hpp"
+
+/*!
+ * \file FtdiJtagBitBang.hpp
+ * \class FtdiJtagBitBang
+ * \brief concrete class between jtag implementation and FTDI capable bitbang mode
+ * \author Gwenhael Goavec-Merou
+ */
+
+class FtdiJtagBitBang : public JtagInterface, private FTDIpp_MPSSE {
+ public:
+	FtdiJtagBitBang(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+		const jtag_pins_conf_t *pin_conf, std::string dev,
+		uint32_t clkHZ, bool verbose = false);
+	FtdiJtagBitBang(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+		const jtag_pins_conf_t *pin_conf, uint32_t clkHZ, bool verbose);
+	virtual ~FtdiJtagBitBang();
+
+	int setClkFreq(uint32_t clkHZ) override {
+		return FTDIpp_MPSSE::setClkFreq(clkHZ);
+	}
+	int setClkFreq(uint32_t clkHZ, char use_divide_by_5) override {
+		return FTDIpp_MPSSE::setClkFreq(clkHZ, use_divide_by_5);}
+
+	/* TMS */
+	int storeTMS(uint8_t *tms, int _bit_len, uint8_t tdi = 1,
+		bool read = false) override;
+	int writeTMS(uint8_t *tdo, int len = 0) override;
+
+	/* TDI */
+	int storeTDI(uint8_t tdi, int nb_bit, bool read) override;
+	int storeTDI(uint8_t *tdi, int nb_byte, bool read) override;
+	int writeTDI(uint8_t *tdo, int nb_bit) override;
+
+	/*!
+	 * \brief return internal buffer size (in byte).
+	 * \return _buffer_size divided by 2 (two byte for clk) and divided by 8 (one
+	 * state == one byte)
+	 */
+	int get_buffer_size() override { return _buffer_size/8/2; }
+
+	bool isFull() override { return _nb_bit == 8*get_buffer_size();}
+
+ private:
+	void init_internal(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+		const jtag_pins_conf_t *pin_conf);
+	int write(uint8_t *tdo);
+	int setBitmode(uint8_t mode);
+	uint8_t *_in_buf;
+
+	uint8_t _bitmode;
+	uint8_t _tck_pin; /*!< tck pin: 1 << pin id */
+	uint8_t _tms_pin; /*!< tms pin: 1 << pin id */
+	uint8_t _tdo_pin; /*!< tdo pin: 1 << pin id */
+	uint8_t _tdi_pin; /*!< tdi pin: 1 << pin id */
+	int _nb_bit;
+};
+#endif
diff --git a/src/ftdiJtagMPSSE.cpp b/src/ftdiJtagMPSSE.cpp
new file mode 100644
index 0000000..b2e0427
--- /dev/null
+++ b/src/ftdiJtagMPSSE.cpp
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <libusb.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <iostream>
+#include <map>
+#include <vector>
+#include <string>
+
+#include "ftdiJtagMPSSE.hpp"
+#include "ftdipp_mpsse.hpp"
+
+using namespace std;
+
+#define DEBUG 0
+
+#ifdef DEBUG
+#define display(...) \
+	do { \
+		if (_verbose) fprintf(stdout, __VA_ARGS__); \
+	}while(0)
+#else
+#define display(...) do {}while(0)
+#endif
+
+FtdiJtagMPSSE::FtdiJtagMPSSE(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+			string dev, uint32_t clkHZ, bool verbose):
+			FTDIpp_MPSSE(cable, dev, clkHZ, verbose), _ch552WA(false)
+{
+	init_internal(cable);
+}
+
+FtdiJtagMPSSE::FtdiJtagMPSSE(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+		   uint32_t clkHZ, bool verbose):
+		   FTDIpp_MPSSE(cable, clkHZ, verbose),
+		   _ch552WA(false)
+{
+	init_internal(cable);
+}
+
+FtdiJtagMPSSE::~FtdiJtagMPSSE()
+{
+	int read;
+	/* Before shutdown, we must wait until everything is shifted out
+	 * Do this by temporary enabling loopback mode, write something
+	 * and wait until we can read it back
+	 */
+	static unsigned char tbuf[16] = { SET_BITS_LOW, 0xff, 0x00,
+		SET_BITS_HIGH, 0xff, 0x00,
+		LOOPBACK_START,
+		MPSSE_DO_READ |
+		MPSSE_DO_WRITE | MPSSE_WRITE_NEG | MPSSE_LSB,
+		0x04, 0x00,
+		0xaa, 0x55, 0x00, 0xff, 0xaa,
+		LOOPBACK_END
+	};
+	mpsse_store(tbuf, 16);
+	read = mpsse_read(tbuf, 5);
+	if (read != 5)
+		fprintf(stderr,
+			"Loopback failed, expect problems on later runs %d\n", read);
+
+	free(_in_buf);
+}
+
+void FtdiJtagMPSSE::init_internal(const FTDIpp_MPSSE::mpsse_bit_config &cable)
+{
+	/* search for iProduct -> need to have
+	 * ftdi->usb_dev (libusb_device_handler) -> libusb_device ->
+	 * libusb_device_descriptor
+	 */
+	struct libusb_device * usb_dev = libusb_get_device(_ftdi->usb_dev);
+	struct libusb_device_descriptor usb_desc;
+	unsigned char iProduct[200];
+	libusb_get_device_descriptor(usb_dev, &usb_desc);
+	libusb_get_string_descriptor_ascii(_ftdi->usb_dev, usb_desc.iProduct,
+		iProduct, 200);
+
+	display("iProduct : %s\n", iProduct);
+
+	if (!strncmp((const char *)iProduct, "Sipeed-Debug", 12)) {
+		_ch552WA = true;
+	}
+
+	display("%x\n", cable.bit_low_val);
+	display("%x\n", cable.bit_low_dir);
+	display("%x\n", cable.bit_high_val);
+	display("%x\n", cable.bit_high_dir);
+
+	_in_buf = (unsigned char *)malloc(sizeof(unsigned char) * _buffer_size);
+	bzero(_in_buf, _buffer_size);
+	init(5, 0xfb, BITMODE_MPSSE, (FTDIpp_MPSSE::mpsse_bit_config &)cable);
+}
+
+/**
+ * store tms in
+ * internal buffer
+ * size must be <= 8
+ */
+int FtdiJtagMPSSE::storeTMS(uint8_t *tms, int nb_bit, uint8_t tdi, bool read)
+{
+	int xfer, pos = 0, tx = nb_bit;
+	unsigned char buf[3]= {static_cast<unsigned char>(MPSSE_WRITE_TMS | MPSSE_LSB |
+		MPSSE_BITMODE | MPSSE_WRITE_NEG | ((read) ? MPSSE_DO_READ : 0)),
+		static_cast<unsigned char>(0),
+		static_cast<unsigned char>(0)};
+
+	if (nb_bit == 0)
+		return 0;
+
+	display("%s: %d %s %d %d %x\n", __func__, tdi, (read) ? "true" : "false",
+			nb_bit, (nb_bit / 6) * 3, tms[0]);
+	int plop = 0;
+
+	while (nb_bit != 0) {
+		xfer = (nb_bit > 6) ? 6 : nb_bit;
+		buf[1] = xfer - 1;
+		buf[2] = (tdi)?0x80 : 0x00;
+		for (int i = 0; i < xfer; i++, pos++) {
+			buf[2] |=
+			(((tms[pos >> 3] & (1 << (pos & 0x07))) ? 1 : 0) << i);
+		}
+		nb_bit -= xfer;
+		mpsse_store(buf, 3);
+		plop += 3;
+	}
+
+	return tx;
+}
+
+int FtdiJtagMPSSE::writeTMS(uint8_t *tdo, int len)
+{
+	display("%s %s %d %d\n", __func__, (tdo)?"true":"false", len, (len/8)+1);
+
+	if (tdo) {
+		return mpsse_read(tdo, (len/8)+1);
+	} else {
+		int ret = mpsse_write();
+		if (_ch552WA) {
+			uint8_t c[len/8+1];
+			ftdi_read_data(_ftdi, c, len/8+1);
+		}
+		return ret;
+	}
+}
+
+/**
+ * store tdi in internal buffer
+ * size must be <= 8
+ */
+int FtdiJtagMPSSE::storeTDI(uint8_t tdi, int nb_bit, bool read)
+{
+	unsigned char tx_buf[3] = {(unsigned char)(MPSSE_LSB | MPSSE_WRITE_NEG |
+		MPSSE_DO_WRITE | MPSSE_BITMODE | ((read) ? MPSSE_DO_READ : 0)),
+		static_cast<unsigned char>(nb_bit - 1),
+		tdi};
+	mpsse_store(tx_buf, 3);
+
+	return nb_bit;
+}
+
+/**
+ * store tdi in internal buffer
+ */
+int FtdiJtagMPSSE::storeTDI(uint8_t *tdi, int nb_byte, bool read)
+{
+	unsigned char tx_buf[3] = {(unsigned char)(MPSSE_LSB | MPSSE_WRITE_NEG |
+		MPSSE_DO_WRITE |
+		((read) ? MPSSE_DO_READ : 0)),
+		static_cast<unsigned char>((nb_byte - 1) & 0xff),
+		static_cast<unsigned char>(((nb_byte - 1) >> 8) & 0xff)};
+	mpsse_store(tx_buf, 3);
+	mpsse_store(tdi, nb_byte);
+
+	return nb_byte;
+}
+
+/* flush buffer
+ * if tdo is not null read nb_bit
+ */
+int FtdiJtagMPSSE::writeTDI(uint8_t *tdo, int nb_bit)
+{
+	int nb_byte = (nb_bit < 8)? 1: (nb_bit >> 3);
+
+	if (tdo) {
+		return mpsse_read(tdo, nb_byte);
+	} else {
+		int ret = mpsse_write();
+		if (_ch552WA) {
+			uint8_t c[nb_byte];
+			ftdi_read_data(_ftdi, c, nb_byte);
+		}
+		return ret;
+	}
+}
diff --git a/src/ftdiJtagMPSSE.hpp b/src/ftdiJtagMPSSE.hpp
new file mode 100644
index 0000000..3b03721
--- /dev/null
+++ b/src/ftdiJtagMPSSE.hpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef FTDIJTAGMPSSE_H
+#define FTDIJTAGMPSSE_H
+#include <ftdi.h>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "jtagInterface.hpp"
+#include "ftdipp_mpsse.hpp"
+
+/*!
+ * \file FtdiJtagMPSSE.hpp
+ * \class FtdiJtagMPSSE
+ * \brief concrete class between jtag implementation and FTDI capable bitbang mode
+ * \author Gwenhael Goavec-Merou
+ */
+
+class FtdiJtagMPSSE : public JtagInterface, private FTDIpp_MPSSE {
+ public:
+	FtdiJtagMPSSE(const FTDIpp_MPSSE::mpsse_bit_config &cable, std::string dev,
+		uint32_t clkHZ, bool verbose = false);
+	FtdiJtagMPSSE(const FTDIpp_MPSSE::mpsse_bit_config &cable,
+		uint32_t clkHZ, bool verbose);
+	virtual ~FtdiJtagMPSSE();
+
+	int setClkFreq(uint32_t clkHZ) override {
+		return FTDIpp_MPSSE::setClkFreq(clkHZ);
+	}
+	int setClkFreq(uint32_t clkHZ, char use_divide_by_5) override {
+		return FTDIpp_MPSSE::setClkFreq(clkHZ, use_divide_by_5);}
+
+	/* TMS */
+	int storeTMS(uint8_t *tms, int nb_bit, uint8_t tdi = 1,
+				bool read = false) override;
+	int writeTMS(uint8_t *tdo, int len = 0) override;
+	/* TDI */
+	int storeTDI(uint8_t tdi, int nb_bit, bool read) override;
+	int storeTDI(uint8_t *tdi, int nb_byte, bool read) override;
+	int writeTDI(uint8_t *tdo, int nb_bit) override;
+
+	/*!
+	 * \brief return internal buffer size (in byte).
+	 * \return _buffer_size -3 for mpsse cmd + size, -1 for potential SEND_IMMEDIATE
+	 */
+	int get_buffer_size() override { return _buffer_size-3; }
+
+	bool isFull() override { return false;}
+
+ private:
+	void init_internal(const FTDIpp_MPSSE::mpsse_bit_config &cable);
+	uint8_t *_in_buf;
+	bool _ch552WA; /* avoid errors with SiPeed tangNano */
+};
+#endif
diff --git a/src/ftdijtag.hpp b/src/ftdijtag.hpp
deleted file mode 100644
index c7fa615..0000000
--- a/src/ftdijtag.hpp
+++ /dev/null
@@ -1,65 +0,0 @@
-#ifndef FTDIJTAG_H
-#define FTDIJTAG_H
-#include <ftdi.h>
-#include <iostream>
-#include <vector>
-
-#include "ftdipp_mpsse.hpp"
-
-class FtdiJtag : public FTDIpp_MPSSE {
- public:
-	//FtdiJtag(std::string board_name, int vid, int pid, unsigned char interface, uint32_t clkHZ);
-	FtdiJtag(FTDIpp_MPSSE::mpsse_bit_config &cable, std::string dev,
-		unsigned char interface, uint32_t clkHZ, bool verbose = false);
-	FtdiJtag(FTDIpp_MPSSE::mpsse_bit_config &cable, unsigned char interface, uint32_t clkHZ,
-		bool verbose);
-	~FtdiJtag();
-
-	int detectChain(std::vector<int> &devices, int max_dev);
-
-	int shiftIR(unsigned char *tdi, unsigned char *tdo, int irlen, int end_state = RUN_TEST_IDLE);
-	int shiftIR(unsigned char tdi, int irlen, int end_state = RUN_TEST_IDLE);
-	int shiftDR(unsigned char *tdi, unsigned char *tdo, int drlen, int end_state = RUN_TEST_IDLE);
-	int read_write(unsigned char *tdi, unsigned char *tdo, int len, char last);
-
-	void toggleClk(int nb);
-	void go_test_logic_reset();
-	void set_state(int newState);
-	int flushTMS(bool flush_buffer = false);
-	void flush() {mpsse_write();}
-	void setTMS(unsigned char tms);
-
-	enum tapState_t {
-		TEST_LOGIC_RESET = 0,
-		RUN_TEST_IDLE = 1,
-		SELECT_DR_SCAN = 2,
-		CAPTURE_DR = 3,
-		SHIFT_DR = 4,
-		EXIT1_DR = 5,
-		PAUSE_DR = 6,
-		EXIT2_DR = 7,
-		UPDATE_DR = 8,
-		SELECT_IR_SCAN = 9,
-		CAPTURE_IR = 10,
-		SHIFT_IR = 11,
-		EXIT1_IR = 12,
-		PAUSE_IR = 13,
-		EXIT2_IR = 14,
-		UPDATE_IR = 15,
-		UNKNOWN = 999
-	};
-	const char *getStateName(tapState_t s);
-
-	/* utilities */
-	void setVerbose(bool verbose){_verbose=verbose;}
-
- private:
-	void init_internal(FTDIpp_MPSSE::mpsse_bit_config &cable);
-	int _state;
-	int _tms_buffer_size;
-	int _num_tms;
-	unsigned char *_tms_buffer;
-	std::string _board_name;
-	bool _ch552WA;
-};
-#endif
diff --git a/src/ftdipp_mpsse.cpp b/src/ftdipp_mpsse.cpp
index 2c2b610..85c49d6 100644
--- a/src/ftdipp_mpsse.cpp
+++ b/src/ftdipp_mpsse.cpp
@@ -18,14 +18,20 @@ using namespace std;
 #define display(...) \
 	do { if (_verbose) fprintf(stdout, __VA_ARGS__);}while(0)
 
-FTDIpp_MPSSE::FTDIpp_MPSSE(const string &dev, unsigned char interface,
+FTDIpp_MPSSE::FTDIpp_MPSSE(const mpsse_bit_config &cable, const string &dev,
 			   uint32_t clkHZ, bool verbose):_verbose(verbose), _vid(0),
-				_pid(0), _bus(-1), _addr(-1), _product(""), _interface(interface),
+				_pid(0), _bus(-1), _addr(-1), _product(""),
+				_interface(cable.interface),
 				_clkHZ(clkHZ), _buffer_size(2*32768), _num(0)
 {
-	if (!search_with_dev(dev)) {
-		cerr << "No cable found" << endl;
-		throw std::exception();
+	if (!dev.empty()) {
+		if (!search_with_dev(dev)) {
+			cerr << "No cable found" << endl;
+			throw std::exception();
+		}
+	} else {
+		_vid = cable.vid;
+		_pid = cable.pid;
 	}
 
 	open_device(115200);
@@ -38,10 +44,10 @@ FTDIpp_MPSSE::FTDIpp_MPSSE(const string &dev, unsigned char interface,
 	}
 }
 
-FTDIpp_MPSSE::FTDIpp_MPSSE(int vid, int pid, unsigned char interface,
-			   uint32_t clkHZ, bool verbose):_verbose(verbose), _vid(vid),
-			   _pid(pid), _bus(-1),
-			   _addr(-1), _product(""), _interface(interface),
+FTDIpp_MPSSE::FTDIpp_MPSSE(const mpsse_bit_config &cable,
+			   uint32_t clkHZ, bool verbose):_verbose(verbose),
+			   _vid(cable.vid), _pid(cable.pid), _bus(-1),
+			   _addr(-1), _product(""), _interface(cable.interface),
 			   _clkHZ(clkHZ), _buffer_size(2*32768), _num(0)
 {
 	open_device(115200);
@@ -138,6 +144,7 @@ int FTDIpp_MPSSE::close_device()
 
 
 int FTDIpp_MPSSE::init(unsigned char latency, unsigned char bitmask_mode,
+				unsigned char mode,
 			   mpsse_bit_config & bit_conf)
 {
 	unsigned char buf_cmd[6] = { SET_BITS_LOW, 0, 0,
@@ -153,6 +160,7 @@ int FTDIpp_MPSSE::init(unsigned char latency, unsigned char bitmask_mode,
 		cout << "bitmode_reset error" << endl;
 		return -1;
 	}
+
 	if (ftdi_usb_purge_buffers(_ftdi) != 0) {
 		cout << "reset error" << endl;
 		return -1;
@@ -161,25 +169,30 @@ int FTDIpp_MPSSE::init(unsigned char latency, unsigned char bitmask_mode,
 		cout << "reset error" << endl;
 		return -1;
 	}
-	/* enable MPSSE mode */
-	if (ftdi_set_bitmode(_ftdi, bitmask_mode, BITMODE_MPSSE) < 0) {
+	/* enable mode */
+	if (ftdi_set_bitmode(_ftdi, bitmask_mode, mode) < 0) {
 		cout << "bitmode_mpsse error" << endl;
 		return -1;
 	}
+	if (mode == BITMODE_MPSSE) {
 
-	unsigned char buf1[5];
-	ftdi_read_data(_ftdi, buf1, 5);
+		unsigned char buf1[5];
+		ftdi_read_data(_ftdi, buf1, 5);
 
-	if (setClkFreq(_clkHZ, 0) < 0)
-		return -1;
+		if (setClkFreq(_clkHZ, 0) < 0)
+			return -1;
 
-	buf_cmd[1] = bit_conf.bit_low_val;  // 0xe8;
-	buf_cmd[2] = bit_conf.bit_low_dir;  // 0xeb;
+		buf_cmd[1] = bit_conf.bit_low_val;  // 0xe8;
+		buf_cmd[2] = bit_conf.bit_low_dir;  // 0xeb;
 
-	buf_cmd[4] = bit_conf.bit_high_val;  // 0x00;
-	buf_cmd[5] = bit_conf.bit_high_dir;  // 0x60;
-	mpsse_store(buf_cmd, 6);
-	mpsse_write();
+		buf_cmd[4] = bit_conf.bit_high_val;  // 0x00;
+		buf_cmd[5] = bit_conf.bit_high_dir;  // 0x60;
+		mpsse_store(buf_cmd, 6);
+		mpsse_write();
+	}
+
+	ftdi_read_data_set_chunksize(_ftdi, _buffer_size);
+	ftdi_write_data_set_chunksize(_ftdi, _buffer_size);
 
 	return 0;
 }
@@ -237,6 +250,7 @@ int FTDIpp_MPSSE::setClkFreq(uint32_t clkHZ, char use_divide_by_5)
         return -1;
     }
 	ret = ftdi_read_data(_ftdi, buffer, 4);
+	ftdi_usb_purge_buffers(_ftdi);
 
     return real_freq;
 }
diff --git a/src/ftdipp_mpsse.hpp b/src/ftdipp_mpsse.hpp
index d76b2d9..247ba25 100644
--- a/src/ftdipp_mpsse.hpp
+++ b/src/ftdipp_mpsse.hpp
@@ -5,22 +5,24 @@
 
 class FTDIpp_MPSSE {
 	public:
-		FTDIpp_MPSSE(const std::string &dev, unsigned char interface,
-			uint32_t clkHZ, bool verbose = false);
-		FTDIpp_MPSSE(int vid, int pid, unsigned char interface,
-			uint32_t clkHZ, bool verbose = false);
-		~FTDIpp_MPSSE();
-
 		typedef struct {
 			int vid;
 			int pid;
+			int interface;
 			int bit_low_val;
 			int bit_low_dir;
 			int bit_high_val;
 			int bit_high_dir;
 		} mpsse_bit_config;
 
-		int init(unsigned char latency, unsigned char bitmask_mode, mpsse_bit_config &bit_conf);
+		FTDIpp_MPSSE(const mpsse_bit_config &cable, const std::string &dev,
+			uint32_t clkHZ, bool verbose = false);
+		FTDIpp_MPSSE(const mpsse_bit_config &cablen,
+			uint32_t clkHZ, bool verbose = false);
+		~FTDIpp_MPSSE();
+
+		int init(unsigned char latency, unsigned char bitmask_mode, unsigned char mode,
+				mpsse_bit_config &bit_conf);
 		int setClkFreq(uint32_t clkHZ);
 		int setClkFreq(uint32_t clkHZ, char use_divide_by_5);
 
@@ -39,8 +41,6 @@ class FTDIpp_MPSSE {
 		unsigned int udevstufftoint(const char *udevstring, int base);
 		bool search_with_dev(const std::string &device);
 		bool _verbose;
-		struct ftdi_context *_ftdi;
-
 	private:
 		int _vid;
 		int _pid;
@@ -49,7 +49,10 @@ class FTDIpp_MPSSE {
 		char _product[64];
 		unsigned char _interface;
 		int _clkHZ;
+	protected:
+		struct ftdi_context *_ftdi;
 		int _buffer_size;
+	private:
 		int _num;
 		unsigned char *_buffer;
 };
diff --git a/src/ftdispi.cpp b/src/ftdispi.cpp
index dfceb61..913defe 100644
--- a/src/ftdispi.cpp
+++ b/src/ftdispi.cpp
@@ -62,16 +62,16 @@ void FtdiSpi::setMode(uint8_t mode)
 }
 
 static FTDIpp_MPSSE::mpsse_bit_config bit_conf =
-	{0x08, 0x0B, 0x08, 0x0B};
+	{0x403, 0x6010, INTERFACE_B, 0x08, 0x0B, 0x08, 0x0B};
 
 FtdiSpi::FtdiSpi(int vid, int pid, unsigned char interface, uint32_t clkHZ,
 	bool verbose):
-	FTDIpp_MPSSE(vid, pid, interface, clkHZ, verbose)
+	FTDIpp_MPSSE(bit_conf, clkHZ, verbose)
 {
 	setCSmode(SPI_CS_AUTO);
 	setEndianness(SPI_MSB_FIRST);
 
-	init(1, 0x00, bit_conf);
+	init(1, 0x00, BITMODE_MPSSE, bit_conf);
 }
 FtdiSpi::~FtdiSpi()
 {
diff --git a/src/gowin.cpp b/src/gowin.cpp
index a0e2974..cf133d3 100644
--- a/src/gowin.cpp
+++ b/src/gowin.cpp
@@ -24,7 +24,7 @@
 
 #include <iostream>
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "gowin.hpp"
 #include "progressBar.hpp"
 #include "display.hpp"
@@ -63,7 +63,7 @@ using namespace std;
 #define EF_PROGRAM			0x71
 #define EFLASH_ERASE		0x75
 
-Gowin::Gowin(FtdiJtag *jtag, const string filename, bool flash_wr, bool sram_wr,
+Gowin::Gowin(Jtag *jtag, const string filename, bool flash_wr, bool sram_wr,
 		bool verbose): Device(jtag, filename, verbose)
 {
 	_fs = NULL;
@@ -372,7 +372,7 @@ bool Gowin::flashFLASH(uint8_t *data, int length)
 		progress.display(i);
 	}
 	/* 2.2.6.6 */
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 
 	progress.done();
 	return true;
@@ -390,25 +390,28 @@ bool Gowin::flashSRAM(uint8_t *data, int length)
 	wr_rd(XFER_WRITE, NULL, 0, NULL, 0);
 
 	/* 2.2.6.5 */
-	_jtag->set_state(FtdiJtag::SHIFT_DR);
+	_jtag->set_state(Jtag::SHIFT_DR);
 
-	for (int i=0; i < byte_length; i+=256) {
-		if (i + 256 > byte_length) {  // last packet with some size
+	int xfer_len = 256;
+
+	for (int i=0; i < byte_length; i+=xfer_len) {
+		if (i + xfer_len > byte_length) {  // last packet with some size
 			tx_len = (byte_length - i) * 8;
 			tx_end = 1;  // to move in EXIT1_DR
 		} else {
-			tx_len = 256 * 8;
+			tx_len = xfer_len * 8;
 			tx_end = 0;
 		}
 		_jtag->read_write(data+i, NULL, tx_len, tx_end);
-		_jtag->flush();
+		//_jtag->flush();
 		progress.display(i);
 	}
 	/* 2.2.6.6 */
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 
 	/* p.15 fig 2.11 */
 	wr_rd(XFER_DONE, NULL, 0, NULL, 0);
+
 	if (pollFlag(STATUS_DONE_FINAL, STATUS_DONE_FINAL)) {
 		progress.done();
 		return true;
@@ -426,7 +429,7 @@ bool Gowin::eraseFLASH()
 	unsigned char tx[4] = {0, 0, 0, 0};
 	printInfo("erase Flash ", false);
 	wr_rd(EFLASH_ERASE, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->shiftDR(tx, NULL, 32);
 	/* TN653 specifies to wait for 120ms with
 	 * there are no bit in status register to specify
diff --git a/src/gowin.hpp b/src/gowin.hpp
index a5a33ac..454f620 100644
--- a/src/gowin.hpp
+++ b/src/gowin.hpp
@@ -25,12 +25,12 @@
 
 #include "device.hpp"
 #include "fsparser.hpp"
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "jedParser.hpp"
 
 class Gowin: public Device {
 	public:
-		Gowin(FtdiJtag *jtag, std::string filename, bool flash_wr, bool sram_wr,
+		Gowin(Jtag *jtag, std::string filename, bool flash_wr, bool sram_wr,
 				bool verbose);
 		~Gowin();
 		int idCode() override;
diff --git a/src/ftdijtag.cpp b/src/jtag.cpp
similarity index 63%
rename from src/ftdijtag.cpp
rename to src/jtag.cpp
index 509360c..97e5372 100644
--- a/src/ftdijtag.cpp
+++ b/src/jtag.cpp
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #include <libusb.h>
 
 #include <iostream>
@@ -7,8 +24,11 @@
 #include <string.h>
 #include <string>
 
-#include "ftdijtag.hpp"
+#include "display.hpp"
+#include "jtag.hpp"
 #include "ftdipp_mpsse.hpp"
+#include "ftdiJtagBitbang.hpp"
+#include "ftdiJtagMPSSE.hpp"
 
 using namespace std;
 
@@ -43,81 +63,48 @@ using namespace std;
  *           - envoyer le dernier avec 0x4B ou 0x6B
  */
 
-FtdiJtag::FtdiJtag(FTDIpp_MPSSE::mpsse_bit_config &cable, string dev,
-			unsigned char interface, uint32_t clkHZ, bool verbose):
-			FTDIpp_MPSSE(dev, interface, clkHZ, verbose),
+Jtag::Jtag(cable_t &cable, const jtag_pins_conf_t *pin_conf, string dev,
+			uint32_t clkHZ, bool verbose):
+			_verbose(verbose),
 			_state(RUN_TEST_IDLE),
 			_tms_buffer_size(128), _num_tms(0),
-			_board_name("nope"), _ch552WA(false)
+			_board_name("nope")
 {
-	init_internal(cable);
+	init_internal(cable, dev, pin_conf, clkHZ);
 }
 
-FtdiJtag::FtdiJtag(FTDIpp_MPSSE::mpsse_bit_config &cable,
-		   unsigned char interface, uint32_t clkHZ, bool verbose):
-		   FTDIpp_MPSSE(cable.vid, cable.pid, interface, clkHZ, verbose),
+Jtag::Jtag(cable_t &cable, const jtag_pins_conf_t *pin_conf,
+			uint32_t clkHZ, bool verbose):
+		   _verbose(verbose),
 		   _state(RUN_TEST_IDLE),
 		   _tms_buffer_size(128), _num_tms(0),
-		   _board_name("nope"), _ch552WA(false)
+		   _board_name("nope")
 {
-	init_internal(cable);
+	init_internal(cable, "", pin_conf, clkHZ);
 }
 
-FtdiJtag::~FtdiJtag()
+Jtag::~Jtag()
 {
-	int read;
-	/* Before shutdown, we must wait until everything is shifted out
-	 * Do this by temporary enabling loopback mode, write something
-	 * and wait until we can read it back
-	 * */
-	static unsigned char tbuf[16] = { SET_BITS_LOW, 0xff, 0x00,
-		SET_BITS_HIGH, 0xff, 0x00,
-		LOOPBACK_START,
-		MPSSE_DO_READ |
-		MPSSE_DO_WRITE | MPSSE_WRITE_NEG | MPSSE_LSB,
-		0x04, 0x00,
-		0xaa, 0x55, 0x00, 0xff, 0xaa,
-		LOOPBACK_END
-	};
-	mpsse_store(tbuf, 16);
-	read = mpsse_read(tbuf, 5);
-	if (read != 5)
-		fprintf(stderr,
-			"Loopback failed, expect problems on later runs %d\n", read);
-
 	free(_tms_buffer);
+	delete _jtag;
 }
 
-void FtdiJtag::init_internal(FTDIpp_MPSSE::mpsse_bit_config &cable)
+void Jtag::init_internal(cable_t &cable, const string &dev,
+	const jtag_pins_conf_t *pin_conf, uint32_t clkHZ)
 {
-	/* search for iProduct -> need to have
-	 * ftdi->usb_dev (libusb_device_handler) -> libusb_device ->
-	 * libusb_device_descriptor
-	 */
-	struct libusb_device * usb_dev = libusb_get_device(_ftdi->usb_dev);
-	struct libusb_device_descriptor usb_desc;
-	unsigned char iProduct[200];
-	libusb_get_device_descriptor(usb_dev, &usb_desc);
-	libusb_get_string_descriptor_ascii(_ftdi->usb_dev, usb_desc.iProduct,
-		iProduct, 200);
-
-	display("iProduct : %s\n", iProduct);
-	if (!strncmp((const char *)iProduct, "Sipeed-Debug", 12)) {
-		_ch552WA = true;
+	if (cable.type == MODE_FTDI_BITBANG) {
+		if (pin_conf == NULL)
+			throw std::exception();
+		_jtag = new FtdiJtagBitBang(cable.config, pin_conf, dev, clkHZ, _verbose);
+	} else {
+		_jtag = new FtdiJtagMPSSE(cable.config, dev, clkHZ, _verbose);
 	}
 
-	display("board_name %s\n", _board_name.c_str());
-	display("%x\n", cable.bit_low_val);
-	display("%x\n", cable.bit_low_dir);
-	display("%x\n", cable.bit_high_val);
-	display("%x\n", cable.bit_high_dir);
-
 	_tms_buffer = (unsigned char *)malloc(sizeof(unsigned char) * _tms_buffer_size);
 	bzero(_tms_buffer, _tms_buffer_size);
-	init(5, 0xfb, cable);
 }
 
-int FtdiJtag::detectChain(vector<int> &devices, int max_dev)
+int Jtag::detectChain(vector<int> &devices, int max_dev)
 {
 	unsigned char rx_buff[4];
 	/* WA for CH552/tangNano: write is always mandatory */
@@ -140,9 +127,9 @@ int FtdiJtag::detectChain(vector<int> &devices, int max_dev)
 	return devices.size();
 }
 
-void FtdiJtag::setTMS(unsigned char tms)
+void Jtag::setTMS(unsigned char tms)
 {
-	display("%s %d %d\n", __func__, _num_tms, (_num_tms >> 3));
+	display("%s %x %d %d\n", __func__, tms, _num_tms, (_num_tms >> 3));
 	if (_num_tms+1 == _tms_buffer_size * 8)
 		flushTMS();
 	if (tms != 0)
@@ -158,38 +145,23 @@ void FtdiJtag::setTMS(unsigned char tms)
  * -bit 7 is TDI state for each clk cycles
  */
 
-int FtdiJtag::flushTMS(bool flush_buffer)
+int Jtag::flushTMS(bool flush_buffer)
 {
-	int xfer, pos = 0;
-	unsigned char buf[3]= {MPSSE_WRITE_TMS | MPSSE_LSB | MPSSE_BITMODE |
-			MPSSE_WRITE_NEG, 0, 0};
+	if (_num_tms != 0) {
+		display("%s: %d %x\n", __func__, _num_tms, _tms_buffer[0]);
 
-	if (_num_tms == 0)
-		return 0;
+		_jtag->storeTMS(_tms_buffer, _num_tms);
 
-	display("%s: %d %x\n", __func__, _num_tms, _tms_buffer[0]);
-
-	while (_num_tms != 0) {
-		xfer = (_num_tms > 6) ? 6 : _num_tms;
-		buf[1] = xfer - 1;
-		buf[2] = 0x80;
-		for (int i = 0; i < xfer; i++, pos++) {
-			buf[2] |=
-			(((_tms_buffer[pos >> 3] & (1 << (pos & 0x07))) ? 1 : 0) << i);
-		}
-		_num_tms -= xfer;
-		mpsse_store(buf, 3);
+		/* reset buffer and number of bits */
+		bzero(_tms_buffer, _tms_buffer_size);
+		_num_tms = 0;
 	}
-
-	/* reset buffer and number of bits */
-	bzero(_tms_buffer, _tms_buffer_size);
-	_num_tms = 0;
 	if (flush_buffer)
-		return mpsse_write();
+		return _jtag->writeTMS(NULL);
 	return 0;
 }
 
-void FtdiJtag::go_test_logic_reset()
+void Jtag::go_test_logic_reset()
 {
 	/* idenpendly to current state 5 clk with TMS high is enough */
 	for (int i = 0; i < 6; i++)
@@ -201,44 +173,42 @@ void FtdiJtag::go_test_logic_reset()
 /* GGM: faut tenir plus compte de la taille de la fifo interne
  *      du FT2232 pour maximiser l'envoi au lieu de faire de petits envoies
  */
-int FtdiJtag::read_write(unsigned char *tdi, unsigned char *tdo, int len, char last)
+int Jtag::read_write(unsigned char *tdi, unsigned char *tdo, int len, char last)
 {
 	/* 3 possible case :
 	 *  - n * 8bits to send -> use byte command
 	 *  - less than 8bits   -> use bit command
 	 *  - last bit to send  -> sent in conjunction with TMS
 	 */
-	int tx_buff_size = mpsse_get_buffer_size();
+	int tx_buff_size = _jtag->get_buffer_size();
 	int real_len = (last) ? len - 1 : len;	// if its a buffer in a big send send len
 						// else supress last bit -> with TMS
 	int nb_byte = real_len >> 3;	// number of byte to send
 	int nb_bit = (real_len & 0x07);	// residual bits
-	int xfer = tx_buff_size - 3;
-	unsigned char c[len];
+	int xfer = tx_buff_size;
+
 	unsigned char *rx_ptr = (unsigned char *)tdo;
 	unsigned char *tx_ptr = (unsigned char *)tdi;
-	unsigned char tx_buf[3] = {(unsigned char)(MPSSE_LSB | MPSSE_WRITE_NEG |
-							   ((tdi) ? MPSSE_DO_WRITE : 0) |
-							   ((tdo) ? MPSSE_DO_READ : 0)),
-							   static_cast<unsigned char>((xfer - 1) & 0xff),		// low
-							   static_cast<unsigned char>((((xfer - 1) >> 8) & 0xff))};	// high
 
 	flushTMS(true);
 
-	display("%s len : %d %d %d %d\n", __func__, len, real_len, nb_byte,
-		nb_bit);
+	display("%s len : %d %d %d %d %d\n", __func__, len, real_len, nb_byte,
+		nb_bit, tx_buff_size);
 	while (nb_byte > xfer) {
-		mpsse_store(tx_buf, 3);
-		if (tdi) {
-			mpsse_store(tx_ptr, xfer);
+		display("%s %d %d\n", __func__, nb_byte, xfer);
+
+		if (xfer != _jtag->storeTDI(tx_ptr, xfer, tdo != NULL)) {
+			printError("%s: Fail to store tdi\n", __func__);
+			return -1;
+		}
+		if (0 > _jtag->writeTDI(rx_ptr, xfer * 8)) {
+			printError("%s: Write errror\n", __func__);
+			return -1;
+		}
+		if (tdi)
 			tx_ptr += xfer;
-		}
-		if (tdo) {
-			mpsse_read(rx_ptr, xfer);
+		if (tdo)
 			rx_ptr += xfer;
-		} else if (_ch552WA) {
-			ftdi_read_data(_ftdi, c, xfer);
-		}
 		nb_byte -= xfer;
 	}
 
@@ -246,43 +216,40 @@ int FtdiJtag::read_write(unsigned char *tdi, unsigned char *tdo, int len, char l
 	/* 1/ send serie of byte */
 	if (nb_byte > 0) {
 		display("%s read/write %d byte\n", __func__, nb_byte);
-		tx_buf[1] = ((nb_byte - 1) & 0xff);		// low
-		tx_buf[2] = (((nb_byte - 1) >> 8) & 0xff);	// high
-		mpsse_store(tx_buf, 3);
-		if (tdi) {
-			mpsse_store(tx_ptr, nb_byte);
+		if (nb_byte != _jtag->storeTDI(tx_ptr, nb_byte, tdo != NULL)) {
+			printError("%s: Fail to store tdi\n", __func__);
+			return -1;
+		}
+		if (0 > _jtag->writeTDI(((tdo)?rx_ptr:NULL), nb_byte * 8)) {
+			printError("%s: Write errror\n", __func__);
+			return -1;
+		}
+		if (tdi)
 			tx_ptr += nb_byte;
-		}
-		if (tdo) {
-			mpsse_read(rx_ptr, nb_byte);
+		if (tdo)
 			rx_ptr += nb_byte;
-		} else if (_ch552WA) {
-			ftdi_read_data(_ftdi, c, nb_byte);
-		}
 	}
 
 	unsigned char last_bit = (tdi) ? *tx_ptr : 0;
 
 	if (nb_bit != 0) {
 		display("%s read/write %d bit\n", __func__, nb_bit);
-		tx_buf[0] |= MPSSE_BITMODE;
-		tx_buf[1] = nb_bit - 1;
-		mpsse_store(tx_buf, 2);
-		if (tdi) {
-			display("%s last_bit %x size %d\n", __func__, last_bit, nb_bit-1);
-			mpsse_store(last_bit);
+		if (nb_bit != _jtag->storeTDI(last_bit, nb_bit, tdo != NULL)) {
+			printError("%s: Fail to store tdi\n", __func__);
+			return -1;
 		}
-		mpsse_write();
+		if (0 > _jtag->writeTDI((tdo)?rx_ptr:NULL, nb_bit)) {
+			printError("%s: Write errror\n", __func__);
+			return -1;
+		}
+
 		if (tdo) {
-			mpsse_read(rx_ptr, 1);
 			/* realign we have read nb_bit 
 			 * since LSB add bit by the left and shift
 			 * we need to complete shift
 			 */
 			*rx_ptr >>= (8 - nb_bit);
 			display("%s %x\n", __func__, *rx_ptr);
-		} else if (_ch552WA) {
-			ftdi_read_data(_ftdi, c, nb_bit);
 		}
 	}
 
@@ -295,25 +262,18 @@ int FtdiJtag::read_write(unsigned char *tdi, unsigned char *tdo, int len, char l
 	}
 
 	if (last == 1) {
+		uint8_t c;
 		last_bit = (tdi)? (*tx_ptr & (1 << nb_bit)) : 0;
 
 		display("%s move to EXIT1_xx and send last bit %x\n", __func__, (last_bit?0x81:0x01));
-		/* write the last bit in conjunction with TMS */
-		tx_buf[0] = MPSSE_WRITE_TMS | MPSSE_LSB | MPSSE_BITMODE | MPSSE_WRITE_NEG |
-					((tdo) ? MPSSE_DO_READ : 0);
-		tx_buf[1] = 0x0 ;	// send 1bit
-		tx_buf[2] = ((last_bit)?0x81:0x01);	// we know in TMS tdi is bit 7
-							// and to move to EXIT_XR TMS = 1
-		mpsse_store(tx_buf, 3);
-		mpsse_write();
+
+		c=1;
+		_jtag->storeTMS(&c, 1, (last_bit)?1:0, tdo != NULL);
+		_jtag->writeTMS((tdo)?&c:NULL, 1);
 		if (tdo) {
-			unsigned char c;
-			mpsse_read(&c, 1);
 			/* in this case for 1 one it's always bit 7 */
 			*rx_ptr |= ((c & 0x80) << (7 - nb_bit));
 			display("%s %x\n", __func__, c);
-		} else if (_ch552WA) {
-			ftdi_read_data(_ftdi, c, 1);
 		}
 		_state = (_state == SHIFT_DR) ? EXIT1_DR : EXIT1_IR;
 	}
@@ -321,7 +281,7 @@ int FtdiJtag::read_write(unsigned char *tdi, unsigned char *tdo, int len, char l
 	return 0;
 }
 
-void FtdiJtag::toggleClk(int nb)
+void Jtag::toggleClk(int nb)
 {
 	unsigned char c = (TEST_LOGIC_RESET == _state) ? 1 : 0;
 	for (int i = 0; i < nb; i++)
@@ -329,7 +289,7 @@ void FtdiJtag::toggleClk(int nb)
 	flushTMS(true);
 }
 
-int FtdiJtag::shiftDR(unsigned char *tdi, unsigned char *tdo, int drlen, int end_state)
+int Jtag::shiftDR(unsigned char *tdi, unsigned char *tdo, int drlen, int end_state)
 {
 	set_state(SHIFT_DR);
 	// force transmit tms state
@@ -341,7 +301,7 @@ int FtdiJtag::shiftDR(unsigned char *tdi, unsigned char *tdo, int drlen, int end
 	return 0;
 }
 
-int FtdiJtag::shiftIR(unsigned char tdi, int irlen, int end_state)
+int Jtag::shiftIR(unsigned char tdi, int irlen, int end_state)
 {
 	if (irlen > 8) {
 		cerr << "Error: this method this direct char don't support more than 1 byte" << endl;
@@ -350,7 +310,7 @@ int FtdiJtag::shiftIR(unsigned char tdi, int irlen, int end_state)
 	return shiftIR(&tdi, NULL, irlen, end_state);
 }
 
-int FtdiJtag::shiftIR(unsigned char *tdi, unsigned char *tdo, int irlen, int end_state)
+int Jtag::shiftIR(unsigned char *tdi, unsigned char *tdo, int irlen, int end_state)
 {
 	display("%s: avant shiftIR\n", __func__);
 	set_state(SHIFT_IR);
@@ -358,13 +318,13 @@ int FtdiJtag::shiftIR(unsigned char *tdi, unsigned char *tdo, int irlen, int end
 	// currently don't care about multiple device in the chain
 
 	display("%s: envoi ircode\n", __func__);
-	read_write(tdi, tdo, irlen, 1);// 1 since only one device
+	read_write(tdi, tdo, irlen, 1);  // 1 since only one device
 
 	set_state(end_state);
 	return 0;
 }
 
-void FtdiJtag::set_state(int newState)
+void Jtag::set_state(int newState)
 {
 	unsigned char tms;
 	while (newState != _state) {
@@ -548,13 +508,14 @@ void FtdiJtag::set_state(int newState)
 		}
 
 		setTMS(tms);
-		display("%d %d %d %x\n", tms, _num_tms-1, _state, _tms_buffer[(_num_tms-1) / 8]);
+		display("%d %d %d %x\n", tms, _num_tms-1, _state,
+			_tms_buffer[(_num_tms-1) / 8]);
 	}
 	/* force write buffer */
 	flushTMS();
 }
 
-const char *FtdiJtag::getStateName(tapState_t s)
+const char *Jtag::getStateName(tapState_t s)
 {
 	switch (s) {
 	case TEST_LOGIC_RESET:
diff --git a/src/jtag.hpp b/src/jtag.hpp
new file mode 100644
index 0000000..8469d49
--- /dev/null
+++ b/src/jtag.hpp
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef JTAG_H
+#define JTAG_H
+#include <ftdi.h>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "board.hpp"
+#include "cable.hpp"
+#include "ftdipp_mpsse.hpp"
+#include "jtagInterface.hpp"
+
+class Jtag {
+ public:
+	Jtag(cable_t &cable, const jtag_pins_conf_t *pin_conf, std::string dev,
+		uint32_t clkHZ, bool verbose = false);
+	Jtag(cable_t &cable, const jtag_pins_conf_t *pin_conf,
+		uint32_t clkHZ, bool verbose);
+	~Jtag();
+
+	/* maybe to update */
+	int setClkFreq(uint32_t clkHZ) { return _jtag->setClkFreq(clkHZ);}
+	int setClkFreq(uint32_t clkHZ, char use_divide_by_5) {
+		return _jtag->setClkFreq(clkHZ, use_divide_by_5);}
+
+	int detectChain(std::vector<int> &devices, int max_dev);
+
+	int shiftIR(unsigned char *tdi, unsigned char *tdo, int irlen,
+		int end_state = RUN_TEST_IDLE);
+	int shiftIR(unsigned char tdi, int irlen,
+		int end_state = RUN_TEST_IDLE);
+	int shiftDR(unsigned char *tdi, unsigned char *tdo, int drlen,
+		int end_state = RUN_TEST_IDLE);
+	int read_write(unsigned char *tdi, unsigned char *tdo, int len, char last);
+
+	void toggleClk(int nb);
+	void go_test_logic_reset();
+	void set_state(int newState);
+	int flushTMS(bool flush_buffer = false);
+	void flush() {_jtag->writeTMS(NULL, 0); _jtag->writeTDI(NULL, 0);}
+	void setTMS(unsigned char tms);
+
+	enum tapState_t {
+		TEST_LOGIC_RESET = 0,
+		RUN_TEST_IDLE = 1,
+		SELECT_DR_SCAN = 2,
+		CAPTURE_DR = 3,
+		SHIFT_DR = 4,
+		EXIT1_DR = 5,
+		PAUSE_DR = 6,
+		EXIT2_DR = 7,
+		UPDATE_DR = 8,
+		SELECT_IR_SCAN = 9,
+		CAPTURE_IR = 10,
+		SHIFT_IR = 11,
+		EXIT1_IR = 12,
+		PAUSE_IR = 13,
+		EXIT2_IR = 14,
+		UPDATE_IR = 15,
+		UNKNOWN = 999
+	};
+	const char *getStateName(tapState_t s);
+
+	/* utilities */
+	void setVerbose(bool verbose){_verbose = verbose;}
+
+ private:
+	void init_internal(cable_t &cable, const std::string &dev,
+		const jtag_pins_conf_t *pin_conf, uint32_t clkHZ);
+	bool _verbose;
+	int _state;
+	int _tms_buffer_size;
+	int _num_tms;
+	unsigned char *_tms_buffer;
+	std::string _board_name;
+	JtagInterface *_jtag;
+};
+#endif
diff --git a/src/jtagInterface.hpp b/src/jtagInterface.hpp
new file mode 100644
index 0000000..6438528
--- /dev/null
+++ b/src/jtagInterface.hpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _JTAGINTERFACE_H_
+#define _JTAGINTERFACE_H_
+
+#include <iostream>
+#include <vector>
+
+/*!
+ * \file JtagInterface.hpp
+ * \class JtagInterface
+ * \brief abstract class between jtag implementation and converters
+ * \author Gwenhael Goavec-Merou
+ */
+
+class JtagInterface {
+ public:
+	virtual ~JtagInterface() {}
+
+	virtual int setClkFreq(uint32_t clkHZ) = 0;
+	virtual int setClkFreq(uint32_t clkHZ, char use_divide_by_5) = 0;
+
+	/*!
+	 * \brief store TMS states in internal buffer. Not limited to 8 states
+	 * \param tms: array of TMS values
+	 * \param nb_bit: number of TMS states to store
+	 * \param tdi: state of TDI for all TMS to store
+	 * \return number of states stored
+	 */
+	virtual int storeTMS(uint8_t *tms, int nb_bit, uint8_t tdi = 1,
+						bool read = false) = 0;
+	/*!
+	 * \brief flush TMS internal buffer (ie. transmit to converter)
+	 * \param tdo: pointer for read operation. May be NULL
+	 * \param len: number of bit to send
+	 * \return number of bit send/received
+	 */
+	virtual int writeTMS(uint8_t *tdo, int len = 0) = 0;
+	/*!
+	 * \brief store up to 8 TDI state(s) in internal buffer
+	 * \param tdi: TDI value(s)
+	 * \param tms: state of TMS for all TDI to store
+	 * \param nb_bit: number of TMS states to store
+	 * \return number of states stored
+	 */
+	virtual int storeTDI(uint8_t tdi, int nb_bit, bool read) = 0;
+	/*!
+	 * \brief store TDI multiple of 8 states in internal buffer.
+	 * \param tdi: array of TDI values
+	 * \param tms: state of TMS for all TDI to store
+	 * \param nb_byte: number of TDI states to store
+	 * \return number of states stored
+	 */
+	virtual int storeTDI(uint8_t *tdi, int nb_byte, bool read) = 0;
+	/*!
+	 * \brief flush TDI internal buffer (ie. transmit to converter)
+	 * \param tdo: pointer for read operation. May be NULL
+	 * \return number of bit send/received
+	 */
+	virtual int writeTDI(uint8_t *tdo, int nb_bit) = 0;
+
+	/*!
+	 * \brief return internal buffer size (in byte)
+	 * \return internal buffer size
+	 */
+	virtual int get_buffer_size() = 0;
+
+	/*!
+	 * \brief return status of internal buffer
+	 * \return true when internal buffer is full
+	 */
+	virtual bool isFull() = 0;
+};
+#endif  // _JTAGINTERFACE_H_
diff --git a/src/lattice.cpp b/src/lattice.cpp
index 1fd184f..f5702c5 100644
--- a/src/lattice.cpp
+++ b/src/lattice.cpp
@@ -24,7 +24,7 @@
 
 #include <iostream>
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "lattice.hpp"
 #include "progressBar.hpp"
 #include "display.hpp"
@@ -61,7 +61,7 @@ using namespace std;
 #	define REG_STATUS_CNF_CHK_MASK	(0x7 << 23)
 #	define REG_STATUS_EXEC_ERR	(1 << 26)
 
-Lattice::Lattice(FtdiJtag *jtag, const string filename, bool verbose):
+Lattice::Lattice(Jtag *jtag, const string filename, bool verbose):
 		Device(jtag, filename, verbose)
 {
 	if (_filename != "") {
@@ -182,13 +182,13 @@ bool Lattice::program_mem()
 
 	/* LSC_INIT_ADDRESS */
 	wr_rd(0x46, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 
 	uint8_t *data = _bit.getData();
 	int length = _bit.getLength()/8;
 	wr_rd(0x7A, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(2);
 
 	uint8_t tmp[1024];
@@ -205,10 +205,10 @@ bool Lattice::program_mem()
 		for (int ii = 0; ii < size; ii++)
 			tmp[ii] = ConfigBitstreamParser::reverseByte(data[i+ii]);
 
-		_jtag->shiftDR(tmp, NULL, size*8, FtdiJtag::SHIFT_DR);
+		_jtag->shiftDR(tmp, NULL, size*8, Jtag::SHIFT_DR);
 	}
 
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 
 	if (checkStatus(0, REG_STATUS_CNF_CHK_MASK))
 		progress.done();
@@ -341,7 +341,7 @@ bool Lattice::program_flash()
 
 	/* LSC_INIT_ADDRESS */
 	wr_rd(0x46, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 
 	/* flash UFM */
@@ -354,7 +354,7 @@ bool Lattice::program_flash()
 
 	/* LSC_INIT_ADDRESS */
 	wr_rd(0x46, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 
 	if ((eraseMode & FLASH_ERASE_FEATURE) != 0) {
@@ -425,7 +425,7 @@ bool Lattice::EnableISC(uint8_t flash_mode)
 {
 	wr_rd(ISC_ENABLE, &flash_mode, 1, NULL, 0);
 
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	if (!pollBusyFlag())
 		return false;
@@ -437,7 +437,7 @@ bool Lattice::EnableISC(uint8_t flash_mode)
 bool Lattice::DisableISC()
 {
 	wr_rd(ISC_DISABLE, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	if (!pollBusyFlag())
 		return false;
@@ -450,7 +450,7 @@ bool Lattice::EnableCfgIf()
 {
 	uint8_t tx_buf = 0x08;
 	wr_rd(0x74, &tx_buf, 1, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	return pollBusyFlag();
 }
@@ -459,7 +459,7 @@ bool Lattice::DisableCfg()
 {
 	uint8_t tx_buf, rx_buf;
 	wr_rd(0x26, &tx_buf, 1, &rx_buf, 1);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	return true;
 }
@@ -490,7 +490,7 @@ bool Lattice::checkID()
 	printf("check ID\n");
 	uint8_t tx[4];
 	wr_rd(0xE2, tx, 4, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 
 	uint32_t reg = readStatusReg();
@@ -501,7 +501,7 @@ bool Lattice::checkID()
 	tx[1] = 0xd0;
 	tx[0] = 0x43;
 	wr_rd(0xE2, tx, 4, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	reg = readStatusReg();
 	displayReadReg(reg);
@@ -519,7 +519,7 @@ uint32_t Lattice::readStatusReg()
 	uint32_t reg;
 	uint8_t rx[4], tx[4];
 	wr_rd(0x3C, tx, 4, rx, 4);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	reg = rx[3] << 24 | rx[2] << 16 | rx[1] << 8 | rx[0];
 	return reg;
@@ -543,10 +543,10 @@ bool Lattice::wr_rd(uint8_t cmd,
 			xfer_tx[i] = tx[i];
 	}
 
-	_jtag->shiftIR(&cmd, NULL, 8, FtdiJtag::PAUSE_IR);
+	_jtag->shiftIR(&cmd, NULL, 8, Jtag::PAUSE_IR);
 	if (rx || tx) {
 		_jtag->shiftDR(xfer_tx, (rx) ? xfer_rx : NULL, 8 * xfer_len,
-			FtdiJtag::PAUSE_DR);
+			Jtag::PAUSE_DR);
 	}
 	if (rx) {
 		if (verbose) {
@@ -652,7 +652,7 @@ bool Lattice::pollBusyFlag(bool verbose)
 	int timeout = 0;
 	do {
 		wr_rd(CHECK_BUSY_FLAG, NULL, 0, &rx, 1);
-		_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+		_jtag->set_state(Jtag::RUN_TEST_IDLE);
 		_jtag->toggleClk(1000);
 		if (verbose)
 			printf("pollBusyFlag :%02x\n", rx);
@@ -676,7 +676,7 @@ bool Lattice::flashErase(uint8_t mask)
 {
 	uint8_t tx[1] = {mask};
 	wr_rd(FLASH_ERASE, tx, 1, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	if (!pollBusyFlag())
 		return false;
@@ -692,7 +692,7 @@ bool Lattice::flashProg(uint32_t start_addr, std::vector<std::string> data)
 	for (uint32_t line = 0; line < data.size(); line++) {
 		wr_rd(PROG_CFG_FLASH, (uint8_t *)data[line].c_str(),
 				16, NULL, 0);
-		_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+		_jtag->set_state(Jtag::RUN_TEST_IDLE);
 		_jtag->toggleClk(1000);
 		progress.display(line);
 		if (pollBusyFlag() == false)
@@ -709,20 +709,20 @@ bool Lattice::Verify(JedParser &_jed, bool unlock)
 		EnableISC(0x08);
 
 	wr_rd(0x46, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 
 	tx_buf[0] = 0x73;
-	_jtag->shiftIR(tx_buf, NULL, 8, FtdiJtag::PAUSE_IR);
+	_jtag->shiftIR(tx_buf, NULL, 8, Jtag::PAUSE_IR);
 
 	bzero(tx_buf, 16);
 	bool failure = false;
 	vector<string> data = _jed.data_for_section(0);
 	ProgressBar progress("Verifying", data.size(), 50);
 	for (size_t line = 0;  line< data.size(); line++) {
-		_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+		_jtag->set_state(Jtag::RUN_TEST_IDLE);
 		_jtag->toggleClk(2);
-		_jtag->shiftDR(tx_buf, rx_buf, 16*8, FtdiJtag::PAUSE_DR);
+		_jtag->shiftDR(tx_buf, rx_buf, 16*8, Jtag::PAUSE_DR);
 		for (size_t i = 0; i < data[i].size(); i++) {
 			if (rx_buf[i] != (unsigned char)data[line][i]) {
 				printf("%3ld %3ld %02x -> %02x\n", line, i,
@@ -760,7 +760,7 @@ uint16_t Lattice::readFeabits()
 {
 	uint8_t rx_buf[2];
 	wr_rd(READ_FEABITS, NULL, 0, rx_buf, 2);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 
 	return rx_buf[0] | (((uint16_t)rx_buf[1]) << 8);
@@ -772,7 +772,7 @@ bool Lattice::writeFeaturesRow(uint64_t features, bool verify)
 	for (int i=0; i < 8; i++)
 		tx_buf[i] = ((features >> (i*8)) & 0x00ff);
 	wr_rd(PROG_FEATURE_ROW, tx_buf, 8, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	if (!pollBusyFlag())
 		return false;
@@ -787,7 +787,7 @@ bool Lattice::writeFeabits(uint16_t feabits, bool verify)
 							(uint8_t)(0x00ff & (feabits>>8))};
 
 	wr_rd(PROG_FEABITS, tx_buf, 2, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	if (!pollBusyFlag())
 		return false;
@@ -799,7 +799,7 @@ bool Lattice::writeFeabits(uint16_t feabits, bool verify)
 bool Lattice::writeProgramDone()
 {
 	wr_rd(PROG_DONE, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	if (!pollBusyFlag())
 		return false;
@@ -811,7 +811,7 @@ bool Lattice::writeProgramDone()
 bool Lattice::loadConfiguration()
 {
 	wr_rd(REFRESH, NULL, 0, NULL, 0);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(1000);
 	if (!pollBusyFlag())
 		return false;
diff --git a/src/lattice.hpp b/src/lattice.hpp
index fc81155..cb024ff 100644
--- a/src/lattice.hpp
+++ b/src/lattice.hpp
@@ -23,14 +23,14 @@
 #include <string>
 #include <vector>
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "device.hpp"
 #include "jedParser.hpp"
 #include "latticeBitParser.hpp"
 
 class Lattice: public Device {
 	public:
-		Lattice(FtdiJtag *jtag, std::string filename, bool verbose);
+		Lattice(Jtag *jtag, std::string filename, bool verbose);
 		int idCode() override;
 		int userCode();
 		void reset() override {}
diff --git a/src/main.cpp b/src/main.cpp
index 4a35abb..122d520 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -31,7 +31,7 @@
 #include "display.hpp"
 #include "gowin.hpp"
 #include "lattice.hpp"
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "part.hpp"
 #include "xilinx.hpp"
 
@@ -85,7 +85,8 @@ void displaySupported(const struct arguments &args);
 
 int main(int argc, char **argv)
 {
-	FTDIpp_MPSSE::mpsse_bit_config cable;
+	cable_t cable;
+	jtag_pins_conf_t *pins_config = NULL;
 
 	/* command line args. */
 	struct arguments args = {false, false, false, 0, "", "-", "-", "-",
@@ -100,7 +101,10 @@ int main(int argc, char **argv)
 
 	/* if a board name is specified try to use this to determine cable */
 	if (args.board[0] != '-' && board_list.find(args.board) != board_list.end()) {
-		auto t = cable_list.find(board_list[args.board]);
+		/* set pins config */
+		pins_config = &board_list[args.board].pins_config;
+		/* search for cable */
+		auto t = cable_list.find(board_list[args.board].cable_name);
 		if (t == cable_list.end()) {
 			args.cable = "-";
 			cout << "Board " << args.board << " has not default cable" << endl;
@@ -122,11 +126,11 @@ int main(int argc, char **argv)
 	cable = select_cable->second;
 
 	/* jtag base */
-	FtdiJtag *jtag;
+	Jtag *jtag;
 	if (args.device == "-")
-		jtag = new FtdiJtag(cable, 1, 6000000, false);
+		jtag = new Jtag(cable, pins_config, 6000000, false);
 	else
-		jtag = new FtdiJtag(cable, args.device, 1, 6000000, false);
+		jtag = new Jtag(cable, pins_config, args.device, 6000000, false);
 
 	/* chain detection */
 	vector<int> listDev;
@@ -267,7 +271,7 @@ void displaySupported(const struct arguments &args)
 		t << setw(15) << left << "cable name:" << "vid:pid";
 		printSuccess(t.str());
 		for (auto b = cable_list.begin(); b != cable_list.end(); b++) {
-			FTDIpp_MPSSE::mpsse_bit_config c = (*b).second;
+			FTDIpp_MPSSE::mpsse_bit_config c = (*b).second.config;
 			stringstream ss;
 			ss << setw(15) << left << (*b).first;
 			ss << "0x" << hex << c.vid << ":" << c.pid;
@@ -282,7 +286,8 @@ void displaySupported(const struct arguments &args)
 		printSuccess(t.str());
 		for (auto b = board_list.begin(); b != board_list.end(); b++) {
 			stringstream ss;
-			ss << setw(15) << left << (*b).first << " " << (*b).second;
+			target_cable_t c = (*b).second;
+			ss << setw(15) << left << (*b).first << " " << c.cable_name;
 			printInfo(ss.str());
 		}
 		cout << endl;
diff --git a/src/part.hpp b/src/part.hpp
index b0ebe92..53a38b2 100644
--- a/src/part.hpp
+++ b/src/part.hpp
@@ -38,6 +38,8 @@ static std::map <int, fpga_model> fpga_list = {
 	{0x81112043, {"lattice", "ECP5", "LFE5UM5G-45"}},
 	{0x81113043, {"lattice", "ECP5", "LFE5UM5G-85"}},
 
+	{0x0129a043, {"lattice", "XP2", "LFXP2-8E"}},
+
 	{0x1100581b, {"Gowin", "GW1N", "GW1NR-9"}},
 	{0x0900281B, {"Gowin", "GW1N", "GW1N-1"}},
 	{0x0100381B, {"Gowin", "GW1N", "GW1N-4"}},
diff --git a/src/spiFlash.cpp b/src/spiFlash.cpp
index 0051f56..a5016d1 100644
--- a/src/spiFlash.cpp
+++ b/src/spiFlash.cpp
@@ -20,7 +20,7 @@
 #include <unistd.h>
 #include <iostream>
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "ftdipp_mpsse.hpp"
 #include "progressBar.hpp"
 #include "spiFlash.hpp"
@@ -72,7 +72,7 @@ static uint8_t reverseByte(uint8_t src)
 #define FLASH_WRVECR   0x61
 #define FLASH_RDVECR   0x65
 
-SPIFlash::SPIFlash(FtdiJtag *jtag, bool verbose):_jtag(jtag), _verbose(verbose)
+SPIFlash::SPIFlash(Jtag *jtag, bool verbose):_jtag(jtag), _verbose(verbose)
 {
 }
 
@@ -116,8 +116,8 @@ int SPIFlash::wait(uint8_t mask, uint8_t cond, uint32_t timeout, bool verbose)
 	uint8_t tx = reverseByte(FLASH_RDSR);
 	uint32_t count = 0;
 
-	_jtag->shiftIR(USER1, 6, FtdiJtag::UPDATE_IR);
-	_jtag->set_state(FtdiJtag::SHIFT_DR);
+	_jtag->shiftIR(USER1, 6, Jtag::UPDATE_IR);
+	_jtag->set_state(Jtag::SHIFT_DR);
 	_jtag->read_write(&tx, NULL, 8, 0);
 
 	do {
diff --git a/src/spiFlash.hpp b/src/spiFlash.hpp
index d4c303a..ffe19b0 100644
--- a/src/spiFlash.hpp
+++ b/src/spiFlash.hpp
@@ -18,11 +18,11 @@
 #ifndef SPIFLASH_HPP
 #define SPIFLASH_HPP
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 
 class SPIFlash {
 	public:
-		SPIFlash(FtdiJtag *jtag, bool verbose);
+		SPIFlash(Jtag *jtag, bool verbose);
 		/* power */
 		void power_up();
 		void power_down();
@@ -46,7 +46,7 @@ class SPIFlash {
 		void jtag_write_read(uint8_t cmd, uint8_t *tx, uint8_t *rx, uint16_t len = 0);
 		int wait(uint8_t mask, uint8_t cond, uint32_t timeout, bool verbose=false);
 
-		FtdiJtag *_jtag;
+		Jtag *_jtag;
 		bool _verbose;
 };
 
diff --git a/src/svf_jtag.cpp b/src/svf_jtag.cpp
index 999abcb..ced4dfe 100644
--- a/src/svf_jtag.cpp
+++ b/src/svf_jtag.cpp
@@ -4,7 +4,7 @@
 #include <map>
 #include <vector>
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 
 #include "svf_jtag.hpp"
 
@@ -231,7 +231,7 @@ void SVF_jtag::handle_instruction(vector<string> const &vstr)
 	}
 }
 
-SVF_jtag::SVF_jtag(FtdiJtag *jtag, bool verbose):_verbose(verbose), _freq_hz(0),
+SVF_jtag::SVF_jtag(Jtag *jtag, bool verbose):_verbose(verbose), _freq_hz(0),
 	_enddr(fsm_state["IDLE"]), _endir(fsm_state["IDLE"]),
 	_run_state(fsm_state["IDLE"]), _end_state(fsm_state["IDLE"])
 
diff --git a/src/svf_jtag.hpp b/src/svf_jtag.hpp
index a7ad930..d1805de 100644
--- a/src/svf_jtag.hpp
+++ b/src/svf_jtag.hpp
@@ -3,11 +3,13 @@
 #include <iostream>
 #include <vector>
 #include <map>
+
+#include "jtag.hpp"
 using namespace std;
 
 class SVF_jtag {
  public:
-	SVF_jtag(FtdiJtag *jtag, bool verbose);
+	SVF_jtag(Jtag *jtag, bool verbose);
 	~SVF_jtag();
 	void parse(string filename);
 	void setVerbose(bool verbose) {_verbose = verbose;}
@@ -46,7 +48,7 @@ class SVF_jtag {
 		{"IRUPDATE", 15}
 	};
 
-	FtdiJtag *_jtag;
+	Jtag *_jtag;
 	bool _verbose;
 
 	uint32_t _freq_hz;
diff --git a/src/xilinx.cpp b/src/xilinx.cpp
index 99521e5..1ebf45a 100644
--- a/src/xilinx.cpp
+++ b/src/xilinx.cpp
@@ -1,7 +1,7 @@
 #include <iostream>
 #include <stdexcept>
 
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 #include "bitparser.hpp"
 #include "mcsParser.hpp"
 #include "spiFlash.hpp"
@@ -10,7 +10,7 @@
 #include "part.hpp"
 #include "progressBar.hpp"
 
-Xilinx::Xilinx(FtdiJtag *jtag, std::string filename, bool verbose):
+Xilinx::Xilinx(Jtag *jtag, std::string filename, bool verbose):
 	Device(jtag, filename, verbose)
 {
 	if (_filename != ""){
@@ -36,23 +36,24 @@ void Xilinx::reset()
 {
 	_jtag->shiftIR(JSHUTDOWN, 6);
 	_jtag->shiftIR(JPROGRAM, 6);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(10000*12);
 
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(2000);
 
 	_jtag->shiftIR(BYPASS, 6);
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(2000);
 }
 
 int Xilinx::idCode()
 {
+	unsigned char tx_data[4]= {0x00, 0x00, 0x00, 0x00};
 	unsigned char rx_data[4];
 	_jtag->go_test_logic_reset();
 	_jtag->shiftIR(IDCODE, 6);
-	_jtag->shiftDR(NULL, rx_data, 32);
+	_jtag->shiftDR(tx_data, rx_data, 32);
 	return ((rx_data[0] & 0x000000ff) |
 		((rx_data[1] << 8) & 0x0000ff00) |
 		((rx_data[2] << 16) & 0x00ff0000) |
@@ -128,7 +129,7 @@ void Xilinx::program_mem(BitParser &bitfile)
 	/*
 	 * 8: Move into the RTI state.                        X     0   10,000(1)
 	 */
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(10000*12);
 	/*
 	 * 9: Start loading the CFG_IN instruction,
@@ -141,11 +142,11 @@ void Xilinx::program_mem(BitParser &bitfile)
 	/*
 	 * 11: Enter the SELECT-DR state.                     X     1   2
 	 */
-	_jtag->set_state(FtdiJtag::SELECT_DR_SCAN);
+	_jtag->set_state(Jtag::SELECT_DR_SCAN);
 	/*
 	 * 12: Enter the SHIFT-DR state.                      X     0   2
 	 */
-	_jtag->set_state(FtdiJtag::SHIFT_DR);
+	_jtag->set_state(Jtag::SHIFT_DR);
 	/*
 	 * 13: Shift in the FPGA bitstream. Bitn (MSB)
 	 *     is the first bit in the bitstream(2).    bit1...bitn 0  (bits in bitstream)-1
@@ -177,11 +178,11 @@ void Xilinx::program_mem(BitParser &bitfile)
 	/*
 	 * 15: Enter UPDATE-DR state.                         X     1   1
 	 */
-	_jtag->set_state(FtdiJtag::UPDATE_DR);
+	_jtag->set_state(Jtag::UPDATE_DR);
 	/*
 	 * 16: Move into RTI state.                           X     0   1
 	 */
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	/*
 	 * 17: Enter the SELECT-IR state.                     X     1   2
 	 * 18: Move to the SHIFT-IR state.                    X     0   2
@@ -191,13 +192,13 @@ void Xilinx::program_mem(BitParser &bitfile)
 	 * 20: Load the last bit of the JSTART instruction.   0     1   1
 	 * 21: Move to the UPDATE-IR state.                   X     1   1
 	 */
-	_jtag->shiftIR(JSTART, 6, FtdiJtag::UPDATE_IR);
+	_jtag->shiftIR(JSTART, 6, Jtag::UPDATE_IR);
 	/*
 	 * 22: Move to the RTI state and clock the
 	 *     startup sequence by applying a minimum         X     0   2000
 	 *     of 2000 clock cycles to the TCK.
 	 */
-	_jtag->set_state(FtdiJtag::RUN_TEST_IDLE);
+	_jtag->set_state(Jtag::RUN_TEST_IDLE);
 	_jtag->toggleClk(2000);
 	/*
 	 * 23: Move to the TLR state. The device is
diff --git a/src/xilinx.hpp b/src/xilinx.hpp
index e7d91ae..1e6b80c 100644
--- a/src/xilinx.hpp
+++ b/src/xilinx.hpp
@@ -3,11 +3,11 @@
 
 #include "bitparser.hpp"
 #include "device.hpp"
-#include "ftdijtag.hpp"
+#include "jtag.hpp"
 
 class Xilinx: public Device {
 	public:
-		Xilinx(FtdiJtag *jtag, std::string filename, bool verbose);
+		Xilinx(Jtag *jtag, std::string filename, bool verbose);
 		~Xilinx();
 
 		void program(unsigned int offset = 0) override;