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latticeBitParser, lattice: added 128 clock pulses padding before preamble: Required by ECP3 family

This commit is contained in:
Gwenhael Goavec-Merou 2026-02-25 09:53:28 +01:00
parent 0bc2594469
commit 35089045ea
3 changed files with 20 additions and 7 deletions
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5
src/lattice.cpp
View File

@ -331,7 +331,7 @@ bool Lattice::program_mem()
{
bool err;
LatticeBitParser _bit(_filename, false, _verbose);
LatticeBitParser _bit(_filename, false, false, _verbose);
printInfo("Open file: ", false);
printSuccess("DONE");
@ -950,7 +950,8 @@ bool Lattice::program_extFlash(unsigned int offset, bool unprotect_flash)
if (_file_extension == "mcs")
_bit = new McsParser(_filename, true, _verbose);
else if (_file_extension == "bit")
_bit = new LatticeBitParser(_filename, false, _verbose);
_bit = new LatticeBitParser(_filename, false,
_fpga_family==ECP3_FAMILY, _verbose);
else
_bit = new RawParser(_filename, false);
printSuccess("DONE");

19
src/latticeBitParser.cpp
View File

@ -21,10 +21,10 @@
using namespace std;
LatticeBitParser::LatticeBitParser(const string &filename, bool machxo2,
LatticeBitParser::LatticeBitParser(const string &filename, bool machxo2, bool ecp3,
bool verbose):
ConfigBitstreamParser(filename, ConfigBitstreamParser::BIN_MODE, verbose),
_endHeader(0), _is_machXO2(machxo2)
_endHeader(0), _is_machXO2(machxo2), _is_ecp3(ecp3)
{}
LatticeBitParser::~LatticeBitParser()
@ -135,8 +135,19 @@ int LatticeBitParser::parse()
/* read All data */
if (!_is_machXO2) {
_bit_data.resize(_raw_data.size() - _endHeader);
std::move(_raw_data.begin()+_endHeader, _raw_data.end(), _bit_data.begin());
/* According to FPGA-TN-02192-3.4
* the Lattice ECP3 must trasnmit at least 128 clock pulses before
* receiving the preamble.
* Here the header contains 16 Dummy bit + preamble so only
* 14bits 8x14= 112bits must be added as padding.
*/
const uint32_t offset = (_is_ecp3) ? 14 : 0;
_bit_data.resize(_raw_data.size() - _endHeader + offset);
if (_is_ecp3) {
std::string tmp(14, 0xff);
std::move(tmp.begin(), tmp.end(), _bit_data.begin());
}
std::move(_raw_data.begin() + _endHeader, _raw_data.end(), _bit_data.begin() + offset);
_bit_length = _bit_data.size() * 8;
} else {
const uint32_t len = _raw_data.size() - _endHeader;

3
src/latticeBitParser.hpp
View File

@ -15,7 +15,7 @@
class LatticeBitParser: public ConfigBitstreamParser {
public:
LatticeBitParser(const std::string &filename, bool machxo2,
LatticeBitParser(const std::string &filename, bool machxo2, bool ecp3,
bool verbose = false);
~LatticeBitParser();
int parse() override;
@ -31,6 +31,7 @@ class LatticeBitParser: public ConfigBitstreamParser {
bool parseCfgData();
size_t _endHeader;
bool _is_machXO2;
bool _is_ecp3;
/* data storage for machXO2 */
std::vector<std::string> _bit_array;
};