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UberDDR3/rtl/ddr3_top.v

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////////////////////////////////////////////////////////////////////////////////
//
// Filename: ddr3_top.v
// Project: UberDDR3 - An Open Source DDR3 Controller
//
// Purpose: Top module which instantiates the ddr3_controller and ddr3_phy modules
// Use this as top module for instantiating UberDDR3 with Wishbone Interface.
//
// Engineer: Angelo C. Jacobo
//
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2023-2025 Angelo Jacobo
//
// 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/>.
//
////////////////////////////////////////////////////////////////////////////////
`default_nettype none
`timescale 1ps / 1ps
module ddr3_top #(
parameter CONTROLLER_CLK_PERIOD = 12_000, //ps, clock period of the controller interface
DDR3_CLK_PERIOD = 3_000, //ps, clock period of the DDR3 RAM device (must be 1/4 of the CONTROLLER_CLK_PERIOD)
ROW_BITS = 14, //width of row address
COL_BITS = 10, //width of column address
BA_BITS = 3, //width of bank address
BYTE_LANES = 2, //number of byte lanes of DDR3 RAM
AUX_WIDTH = 4, //width of aux line (must be >= 4)
WB2_ADDR_BITS = 7, //width of 2nd wishbone address bus
WB2_DATA_BITS = 32, //width of 2nd wishbone data bus
DUAL_RANK_DIMM = 0, // enable dual rank DIMM (1 = enable, 0 = disable)
// DDR3 timing parameter values
parameter SPEED_BIN = 3, // 0 = Use top-level parameters , 1 = DDR3-1066 (7-7-7) , 2 = DR3-1333 (9-9-9) , 3 = DDR3-1600 (11-11-11)
SDRAM_CAPACITY = 5, // 0 = 256Mb, 1 = 512Mb, 2 = 1Gb, 3 = 2Gb, 4 = 4Gb, 5 = 8Gb, 6 = 16Gb
TRCD = 13_750, // ps Active to Read/Write command time (only used if SPEED_BIN = 0)
TRP = 13_750, // ps Precharge command period (only used if SPEED_BIN = 0)
TRAS = 35_000, // ps ACT to PRE command period (only used if SPEED_BIN = 0)
parameter[0:0] MICRON_SIM = 0, //enable faster simulation for micron ddr3 model (shorten POWER_ON_RESET_HIGH and INITIAL_CKE_LOW)
ODELAY_SUPPORTED = 0, //set to 1 when ODELAYE2 is supported
SECOND_WISHBONE = 0, //set to 1 if 2nd wishbone for debugging is needed
WB_ERROR = 0, // set to 1 to support Wishbone error (asserts at ECC double bit error)
SKIP_INTERNAL_TEST = 0, // skip built-in self test (would require >2 seconds of internal test right after calibration)
parameter[1:0] ECC_ENABLE = 0, // set to 1 or 2 to add ECC (1 = Side-band ECC per burst, 2 = Side-band ECC per 8 bursts , 3 = Inline ECC )
parameter[1:0] DIC = 2'b00, //Output Driver Impedance Control (2'b00 = RZQ/6, 2'b01 = RZQ/7, RZQ = 240ohms) (only change when you know what you are doing)
parameter[2:0] RTT_NOM = 3'b011, //RTT Nominal (3'b000 = disabled, 3'b001 = RZQ/4, 3'b010 = RZQ/2 , 3'b011 = RZQ/6, RZQ = 240ohms) (only change when you know what you are doing)
parameter[1:0] SELF_REFRESH = 2'b00, // 0 = use i_user_self_refresh input, 1 = Self-refresh mode is enabled after 64 controller clock cycles of no requests, 2 = 128 cycles, 3 = 256 cycles
parameter // The next parameters act more like a localparam (since user does not have to set this manually) but was added here to simplify port declaration
DQ_BITS = 8, //device width (fixed to 8, if DDR3 is x16 then BYTE_LANES will be 2 while )
serdes_ratio = 4, // this controller is fixed as a 4:1 memory controller (CONTROLLER_CLK_PERIOD/DDR3_CLK_PERIOD = 4)
wb_addr_bits = ROW_BITS + COL_BITS + BA_BITS - $clog2(serdes_ratio*2) + DUAL_RANK_DIMM,
wb_data_bits = DQ_BITS*BYTE_LANES*serdes_ratio*2,
wb_sel_bits = wb_data_bits / 8,
wb2_sel_bits = WB2_DATA_BITS / 8,
//4 is the width of a single ddr3 command {cs_n, ras_n, cas_n, we_n} plus 3 (ck_en, odt, reset_n) plus bank bits plus row bits
cmd_len = 4 + 3 + BA_BITS + ROW_BITS + 2*DUAL_RANK_DIMM
)
(
input wire i_controller_clk, i_ddr3_clk, i_ref_clk, //i_controller_clk = CONTROLLER_CLK_PERIOD, i_ddr3_clk = DDR3_CLK_PERIOD, i_ref_clk = 200MHz
input wire i_ddr3_clk_90, //required only when ODELAY_SUPPORTED is zero
input wire i_rst_n,
//
// Wishbone inputs
input wire i_wb_cyc, //bus cycle active (1 = normal operation, 0 = all ongoing transaction are to be cancelled)
input wire i_wb_stb, //request a transfer
input wire i_wb_we, //write-enable (1 = write, 0 = read)
input wire[wb_addr_bits - 1:0] i_wb_addr, //burst-addressable {row,bank,col}
input wire[wb_data_bits - 1:0] i_wb_data, //write data, for a 4:1 controller data width is 8 times the number of pins on the device
input wire[wb_sel_bits - 1:0] i_wb_sel, //byte strobe for write (1 = write the byte)
input wire[AUX_WIDTH - 1:0] i_aux, //for AXI-interface compatibility (given upon strobe)
// Wishbone outputs
output wire o_wb_stall, //1 = busy, cannot accept requests
output wire o_wb_ack, //1 = read/write request has completed
output wire o_wb_err, //1 = Error due to ECC double bit error (fixed to 0 if WB_ERROR = 0)
output wire[wb_data_bits - 1:0] o_wb_data, //read data, for a 4:1 controller data width is 8 times the number of pins on the device
output wire[AUX_WIDTH - 1:0] o_aux, //for AXI-interface compatibility (given upon strobe)
//
// Wishbone 2 (PHY) inputs
input wire i_wb2_cyc, //bus cycle active (1 = normal operation, 0 = all ongoing transaction are to be cancelled)
input wire i_wb2_stb, //request a transfer
input wire i_wb2_we, //write-enable (1 = write, 0 = read)
input wire[WB2_ADDR_BITS - 1:0] i_wb2_addr, // memory-mapped register to be accessed
input wire[WB2_DATA_BITS - 1:0] i_wb2_data, //write data
input wire[wb2_sel_bits - 1:0] i_wb2_sel, //byte strobe for write (1 = write the byte)
// Wishbone 2 (Controller) outputs
output wire o_wb2_stall, //1 = busy, cannot accept requests
output wire o_wb2_ack, //1 = read/write request has completed
output wire[WB2_DATA_BITS - 1:0] o_wb2_data, //read data
//
// DDR3 I/O Interface
output wire[DUAL_RANK_DIMM:0] o_ddr3_clk_p, o_ddr3_clk_n,
output wire o_ddr3_reset_n,
output wire[DUAL_RANK_DIMM:0] o_ddr3_cke, // CKE
output wire[DUAL_RANK_DIMM:0] o_ddr3_cs_n, // chip select signal
output wire o_ddr3_ras_n, // RAS#
output wire o_ddr3_cas_n, // CAS#
output wire o_ddr3_we_n, // WE#
output wire[ROW_BITS-1:0] o_ddr3_addr,
output wire[BA_BITS-1:0] o_ddr3_ba_addr,
inout wire[(DQ_BITS*BYTE_LANES)-1:0] io_ddr3_dq,
inout wire[BYTE_LANES-1:0] io_ddr3_dqs, io_ddr3_dqs_n,
output wire[BYTE_LANES-1:0] o_ddr3_dm,
output wire[DUAL_RANK_DIMM:0] o_ddr3_odt, // on-die termination
//
// Done Calibration pin
output wire o_calib_complete,
// Debug outputs
output wire[31:0] o_debug1,
// output wire[31:0] o_debug2,
// output wire[31:0] o_debug3,
// output wire[(DQ_BITS*BYTE_LANES)/8-1:0] o_ddr3_debug_read_dqs_p,
// output wire[(DQ_BITS*BYTE_LANES)/8-1:0] o_ddr3_debug_read_dqs_n
//
// User enabled self-refresh
input wire i_user_self_refresh
);
// Instantiation Template (DEFAULT VALUE IS FOR ARTY S7)
/*
// DDR3 Controller
ddr3_top #(
.CONTROLLER_CLK_PERIOD(12_000), //ps, clock period of the controller interface
.DDR3_CLK_PERIOD(3_000), //ps, clock period of the DDR3 RAM device (must be 1/4 of the CONTROLLER_CLK_PERIOD)
.ROW_BITS(14), //width of row address
.COL_BITS(10), //width of column address
.BA_BITS(3), //width of bank address
.BYTE_LANES(2), //number of byte lanes of DDR3 RAM
.AUX_WIDTH(4), //width of aux line (must be >= 4)
.MICRON_SIM(0), //enable faster simulation for micron ddr3 model (shorten POWER_ON_RESET_HIGH and INITIAL_CKE_LOW)
.ODELAY_SUPPORTED(0), //set to 1 if ODELAYE2 is supported
.SECOND_WISHBONE(0), //set to 1 if 2nd wishbone for debugging is needed
.ECC_ENABLE(0), // set to 1 or 2 to add ECC (1 = Side-band ECC per burst, 2 = Side-band ECC per 8 bursts , 3 = Inline ECC )
.WB_ERROR(0), // set to 1 to support Wishbone error (asserts at ECC double bit error)
) ddr3_top
(
//clock and reset
.i_controller_clk(i_controller_clk),
.i_ddr3_clk(i_ddr3_clk), //i_controller_clk has period of CONTROLLER_CLK_PERIOD, i_ddr3_clk has period of DDR3_CLK_PERIOD
.i_ref_clk(i_ref_clk), // usually set to 200 MHz
.i_ddr3_clk_90(i_ddr3_clk_90), //90 degree phase shifted version i_ddr3_clk (required only when ODELAY_SUPPORTED is zero)
.i_rst_n(!i_rst && clk_locked),
//
// Wishbone inputs
.i_wb_cyc(1), //bus cycle active (1 = normal operation, 0 = all ongoing transaction are to be cancelled)
.i_wb_stb(i_wb_stb), //request a transfer
.i_wb_we(i_wb_we), //write-enable (1 = write, 0 = read)
.i_wb_addr(i_wb_addr), //burst-addressable {row,bank,col}
.i_wb_data(i_wb_data), //write data, for a 4:1 controller data width is 8 times the number of pins on the device
.i_wb_sel(16'hffff), //byte strobe for write (1 = write the byte)
.i_aux(i_wb_we), //for AXI-interface compatibility (given upon strobe)
// Wishbone outputs
.o_wb_stall(o_wb_stall), //1 = busy, cannot accept requests
.o_wb_ack(o_wb_ack), //1 = read/write request has completed
.o_wb_err(o_wb_err), //1 = Error due to ECC double bit error (fixed to 0 if WB_ERROR = 0)
.o_wb_data(o_wb_data), //read data, for a 4:1 controller data width is 8 times the number of pins on the device
.o_aux(o_aux),
//
// Wishbone 2 (PHY) inputs
.i_wb2_cyc(0), //bus cycle active (1 = normal operation, 0 = all ongoing transaction are to be cancelled)
.i_wb2_stb(0), //request a transfer
.i_wb2_we(0), //write-enable (1 = write, 0 = read)
.i_wb2_addr(0), //burst-addressable {row,bank,col}
.i_wb2_data(0), //write data, for a 4:1 controller data width is 8 times the number of pins on the device
.i_wb2_sel(0), //byte strobe for write (1 = write the byte)
// Wishbone 2 (Controller) outputs
.o_wb2_stall(), //1 = busy, cannot accept requests
.o_wb2_ack(), //1 = read/write request has completed
.o_wb2_data(), //read data, for a 4:1 controller data width is 8 times the number of pins on the device
//
// DDR3 I/O Interface
.o_ddr3_clk_p(ddr3_clk_p),
.o_ddr3_clk_n(ddr3_clk_n),
.o_ddr3_reset_n(ddr3_reset_n),
.o_ddr3_cke(ddr3_cke),
.o_ddr3_cs_n(ddr3_cs_n), // width = number of DDR3 ranks
.o_ddr3_ras_n(ddr3_ras_n),
.o_ddr3_cas_n(ddr3_cas_n),
.o_ddr3_we_n(ddr3_we_n),
.o_ddr3_addr(ddr3_addr), // width = ROW_BITS
.o_ddr3_ba_addr(ddr3_ba), // width = BA_BITS
.io_ddr3_dq(ddr3_dq), // width = BYTE_LANES*8
.io_ddr3_dqs(ddr3_dqs_p), // width = BYTE_LANES
.io_ddr3_dqs_n(ddr3_dqs_n), // width = BYTE_LANES
.o_ddr3_dm(ddr3_dm), // width = BYTE_LANES
.o_ddr3_odt(ddr3_odt),
// Debug outputs
.o_debug1(),
////////////////////////////////////
);
*/
// Wire connections between controller and phy
wire[cmd_len*serdes_ratio-1:0] cmd;
wire dqs_tri_control, dq_tri_control;
wire toggle_dqs;
wire[wb_data_bits-1:0] data;
wire[wb_sel_bits-1:0] dm;
wire[BYTE_LANES-1:0] bitslip;
wire[DQ_BITS*BYTE_LANES*8-1:0] iserdes_data;
wire[BYTE_LANES*8-1:0] iserdes_dqs;
wire[BYTE_LANES*8-1:0] iserdes_bitslip_reference;
wire idelayctrl_rdy;
wire[4:0] odelay_data_cntvaluein, odelay_dqs_cntvaluein;
wire[4:0] idelay_data_cntvaluein, idelay_dqs_cntvaluein;
wire[BYTE_LANES-1:0] odelay_data_ld, odelay_dqs_ld;
wire[BYTE_LANES-1:0] idelay_data_ld, idelay_dqs_ld;
wire write_leveling_calib;
wire reset;
// logic for self-refresh
reg[8:0] refresh_counter = 0;
reg user_self_refresh;
// refresh counter
always @(posedge i_controller_clk) begin
if(i_wb_stb && i_wb_cyc) begin // if there is Wishbone request, then reset counter
refresh_counter <= 0;
end
else if(!o_wb_stall || user_self_refresh) begin // if no request (but not stalled) OR already on self-refresh, then increment counter
refresh_counter <= refresh_counter + 1;
end
end
// choose self-refresh options
always @* begin
case(SELF_REFRESH)
2'b00: user_self_refresh = i_user_self_refresh; // use input i_user_self_refresh (high = enter self-refresh, low = exit self-refresh)
2'b01: user_self_refresh = refresh_counter[6]; // Self-refresh mode is enabled after 64 controller clock cycles of no requests, then exit Self-refresh after another 64 controller clk cycles
2'b10: user_self_refresh = refresh_counter[7]; // Self-refresh mode is enabled after 128 controller clock cycles of no requests, then exit Self-refresh after another 128 controller clk cycles
2'b11: user_self_refresh = refresh_counter[8]; // Self-refresh mode is enabled after 256 controller clock cycles of no requests, then exit Self-refresh after another 256 controller clk cycles
endcase
end
//module instantiations
ddr3_controller #(
.CONTROLLER_CLK_PERIOD(CONTROLLER_CLK_PERIOD), //ps, clock period of the controller interface
.DDR3_CLK_PERIOD(DDR3_CLK_PERIOD), //ps, clock period of the DDR3 RAM device (must be 1/4 of the CONTROLLER_CLK_PERIOD)
.ROW_BITS(ROW_BITS), //width of row address
.COL_BITS(COL_BITS), //width of column address
.BA_BITS(BA_BITS), //width of bank address
.DQ_BITS(DQ_BITS), //width of DQ
.LANES(BYTE_LANES), // byte lanes
.AUX_WIDTH(AUX_WIDTH), //width of aux line (must be >= 4)
.WB2_ADDR_BITS(WB2_ADDR_BITS), //width of 2nd wishbone address bus
.WB2_DATA_BITS(WB2_DATA_BITS), //width of 2nd wishbone data bus
.MICRON_SIM(MICRON_SIM), //simulation for micron ddr3 model (shorten POWER_ON_RESET_HIGH and INITIAL_CKE_LOW)
.ODELAY_SUPPORTED(ODELAY_SUPPORTED), //set to 1 when ODELAYE2 is supported
.SECOND_WISHBONE(SECOND_WISHBONE), //set to 1 if 2nd wishbone is needed
.ECC_ENABLE(ECC_ENABLE), // set to 1 or 2 to add ECC (1 = Side-band ECC per burst, 2 = Side-band ECC per 8 bursts , 3 = Inline ECC )
.WB_ERROR(WB_ERROR), // set to 1 to support Wishbone error (asserts at ECC double bit error)
.SKIP_INTERNAL_TEST(SKIP_INTERNAL_TEST), // skip built-in self test (would require >2 seconds of internal test right after calibration)
.DIC(DIC), //Output Driver Impedance Control (2'b00 = RZQ/6, 2'b01 = RZQ/7, RZQ = 240ohms)
.RTT_NOM(RTT_NOM), //RTT Nominal (3'b000 = disabled, 3'b001 = RZQ/4, 3'b010 = RZQ/2 , 3'b011 = RZQ/6, RZQ = 240ohms)
.DUAL_RANK_DIMM(DUAL_RANK_DIMM), // enable dual rank DIMM (1 = enable, 0 = disable)
.SPEED_BIN(SPEED_BIN), // 0 = Use top-level parameters , 1 = DDR3-1066 (7-7-7) , 2 = DR3-1333 (9-9-9) , 3 = DDR3-1600 (11-11-11)
.SDRAM_CAPACITY(SDRAM_CAPACITY), // 0 = 256Mb, 1 = 512Mb, 2 = 1Gb, 3 = 2Gb, 4 = 4Gb, 5 = 8Gb, 6 = 16Gb
.TRCD(TRCD), // ps Active to Read/Write command time (only used if SPEED_BIN = 0)
.TRP(TRP), // ps Precharge command period (only used if SPEED_BIN = 0)
.TRAS(TRAS) // ps ACT to PRE command period (only used if SPEED_BIN = 0)
) ddr3_controller_inst (
.i_controller_clk(i_controller_clk), //i_controller_clk has period of CONTROLLER_CLK_PERIOD
.i_rst_n(i_rst_n), //200MHz input clock
// Wishbone inputs
.i_wb_cyc(i_wb_cyc), //bus cycle active (1 = normal operation, 0 = all ongoing transaction are to be cancelled)
.i_wb_stb(i_wb_stb), //request a transfer
.i_wb_we(i_wb_we), //write-enable (1 = write, 0 = read)
.i_wb_addr(i_wb_addr), //burst-addressable {row,bank,col}
.i_wb_data(i_wb_data), //write data, for a 4:1 controller data width is 8 times the number of pins on the device
.i_wb_sel(i_wb_sel), //byte strobe for write (1 = write the byte)
.i_aux(i_aux), //for AXI-interface compatibility (given upon strobe)
// Wishbone outputs
.o_wb_stall(o_wb_stall), //1 = busy, cannot accept requests
.o_wb_ack(o_wb_ack), //1 = read/write request has completed
.o_wb_err(o_wb_err), //1 = Error due to ECC double bit error (fixed to 0 if WB_ERROR = 0)
.o_wb_data(o_wb_data), //read data, for a 4:1 controller data width is 8 times the number of pins on the device
.o_aux(o_aux), //for AXI-interface compatibility (returned upon ack)
// Wishbone 2 (PHY) inputs
.i_wb2_cyc(i_wb2_cyc), //bus cycle active (1 = normal operation, 0 = all ongoing transaction are to be cancelled)
.i_wb2_stb(i_wb2_stb), //request a transfer
.i_wb2_we(i_wb2_we), //write-enable (1 = write, 0 = read)
.i_wb2_addr(i_wb2_addr), // memory-mapped register to be accessed
.i_wb2_data(i_wb2_data), //write data
.i_wb2_sel(i_wb2_sel), //byte strobe for write (1 = write the byte)
// Wishbone 2 (Controller) outputs
.o_wb2_stall(o_wb2_stall), //1 = busy, cannot accept requests
.o_wb2_ack(o_wb2_ack), //1 = read/write request has completed
.o_wb2_data(o_wb2_data), //read data
//
// PHY interface
.i_phy_iserdes_data(iserdes_data),
.i_phy_iserdes_dqs(iserdes_dqs),
.i_phy_iserdes_bitslip_reference(iserdes_bitslip_reference),
.i_phy_idelayctrl_rdy(idelayctrl_rdy),
.o_phy_cmd(cmd),
.o_phy_dqs_tri_control(dqs_tri_control),
.o_phy_dq_tri_control(dq_tri_control),
.o_phy_toggle_dqs(toggle_dqs),
.o_phy_data(data),
.o_phy_dm(dm),
.o_phy_odelay_data_cntvaluein(odelay_data_cntvaluein),
.o_phy_odelay_dqs_cntvaluein(odelay_dqs_cntvaluein),
.o_phy_idelay_data_cntvaluein(idelay_data_cntvaluein),
.o_phy_idelay_dqs_cntvaluein(idelay_dqs_cntvaluein),
.o_phy_odelay_data_ld(odelay_data_ld),
.o_phy_odelay_dqs_ld(odelay_dqs_ld),
.o_phy_idelay_data_ld(idelay_data_ld),
.o_phy_idelay_dqs_ld(idelay_dqs_ld),
.o_phy_bitslip(bitslip),
.o_phy_write_leveling_calib(write_leveling_calib),
.o_phy_reset(reset),
// Done Calibration pin
.o_calib_complete(o_calib_complete),
// Debug outputs
.o_debug1(o_debug1),
// .o_debug2(o_debug2),
// .o_debug3(o_debug3)
// User enabled self-refresh
.i_user_self_refresh(user_self_refresh)
);
ddr3_phy #(
.ROW_BITS(ROW_BITS), //width of row address
.BA_BITS(BA_BITS), //width of bank address
.DQ_BITS(DQ_BITS), //width of DQ
.LANES(BYTE_LANES), //8 lanes of DQ
.CONTROLLER_CLK_PERIOD(CONTROLLER_CLK_PERIOD), //ps, period of clock input to this DDR3 controller module
.DDR3_CLK_PERIOD(DDR3_CLK_PERIOD), //ps, period of clock input to DDR3 RAM device
.ODELAY_SUPPORTED(ODELAY_SUPPORTED), //set to 1 when ODELAYE2 is supported
.DUAL_RANK_DIMM(DUAL_RANK_DIMM) // enable dual rank DIMM (1 = enable, 0 = disable)
) ddr3_phy_inst (
.i_controller_clk(i_controller_clk),
.i_ddr3_clk(i_ddr3_clk),
.i_ref_clk(i_ref_clk),
.i_ddr3_clk_90(i_ddr3_clk_90),
.i_rst_n(i_rst_n),
// Controller Interface
.i_controller_reset(reset),
.i_controller_cmd(cmd),
.i_controller_dqs_tri_control(dqs_tri_control),
.i_controller_dq_tri_control(dq_tri_control),
.i_controller_toggle_dqs(toggle_dqs),
.i_controller_data(data),
.i_controller_dm(dm),
.i_controller_odelay_data_cntvaluein(odelay_data_cntvaluein),
.i_controller_odelay_dqs_cntvaluein(odelay_dqs_cntvaluein),
.i_controller_idelay_data_cntvaluein(idelay_data_cntvaluein),
.i_controller_idelay_dqs_cntvaluein(idelay_dqs_cntvaluein),
.i_controller_odelay_data_ld(odelay_data_ld),
.i_controller_odelay_dqs_ld(odelay_dqs_ld),
.i_controller_idelay_data_ld(idelay_data_ld),
.i_controller_idelay_dqs_ld(idelay_dqs_ld),
.i_controller_bitslip(bitslip),
.i_controller_write_leveling_calib(write_leveling_calib),
.o_controller_iserdes_data(iserdes_data),
.o_controller_iserdes_dqs(iserdes_dqs),
.o_controller_iserdes_bitslip_reference(iserdes_bitslip_reference),
.o_controller_idelayctrl_rdy(idelayctrl_rdy),
// DDR3 I/O Interface
.o_ddr3_clk_p(o_ddr3_clk_p),
.o_ddr3_clk_n(o_ddr3_clk_n),
.o_ddr3_reset_n(o_ddr3_reset_n),
.o_ddr3_cke(o_ddr3_cke), // CKE
.o_ddr3_cs_n(o_ddr3_cs_n), // chip select signal
.o_ddr3_ras_n(o_ddr3_ras_n), // RAS#
.o_ddr3_cas_n(o_ddr3_cas_n), // CAS#
.o_ddr3_we_n(o_ddr3_we_n), // WE#
.o_ddr3_addr(o_ddr3_addr),
.o_ddr3_ba_addr(o_ddr3_ba_addr),
.io_ddr3_dq(io_ddr3_dq),
.io_ddr3_dqs(io_ddr3_dqs),
.io_ddr3_dqs_n(io_ddr3_dqs_n),
.o_ddr3_dm(o_ddr3_dm),
.o_ddr3_odt(o_ddr3_odt), // on-die termination
.o_ddr3_debug_read_dqs_p(/*o_ddr3_debug_read_dqs_p*/),
.o_ddr3_debug_read_dqs_n(/*o_ddr3_debug_read_dqs_n*/)
);
// display value of parameters for easy debugging
initial begin
$display("\nDDR3 TOP PARAMETERS:\n-----------------------------");
$display("CONTROLLER_CLK_PERIOD = %0d", CONTROLLER_CLK_PERIOD);
$display("DDR3_CLK_PERIOD = %0d", DDR3_CLK_PERIOD);
$display("ROW_BITS = %0d", ROW_BITS);
$display("COL_BITS = %0d", COL_BITS);
$display("BA_BITS = %0d", BA_BITS);
$display("BYTE_LANES = %0d", BYTE_LANES);
$display("AUX_WIDTH = %0d", AUX_WIDTH);
$display("WB2_ADDR_BITS = %0d", WB2_ADDR_BITS);
$display("WB2_DATA_BITS = %0d", WB2_DATA_BITS);
$display("MICRON_SIM = %0d", MICRON_SIM);
$display("ODELAY_SUPPORTED = %0d", ODELAY_SUPPORTED);
$display("SECOND_WISHBONE = %0d", SECOND_WISHBONE);
$display("WB_ERROR = %0d", WB_ERROR);
$display("SKIP_INTERNAL_TEST = %0d", SKIP_INTERNAL_TEST);
$display("ECC_ENABLE = %0d", ECC_ENABLE);
$display("DIC = %0d", DIC);
$display("RTT_NOM = %0d", RTT_NOM);
$display("SELF_REFRESH = %0d", SELF_REFRESH);
$display("DUAL_RANK_DIMM = %0d", DUAL_RANK_DIMM);
$display("End of DDR3 TOP PARAMETERS\n-----------------------------");
end
endmodule
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