diff options
Diffstat (limited to 'techlibs/xilinx/synth_xilinx.cc')
-rw-r--r-- | techlibs/xilinx/synth_xilinx.cc | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index e2a625f9b..51d2cbbd2 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -108,10 +108,11 @@ struct SynthXilinxPass : public ScriptPass log(" flatten design before synthesis\n"); log("\n"); log(" -dff\n"); - log(" run 'abc9' with -dff option\n"); + log(" run 'abc'/'abc9' with -dff option\n"); log("\n"); log(" -retime\n"); - log(" run 'abc' with '-dff -D 1' options\n"); + log(" run 'abc' with '-D 1' option to enable flip-flop retiming.\n"); + log(" implies -dff.\n"); log("\n"); log(" -abc9\n"); log(" use new ABC9 flow (EXPERIMENTAL)\n"); @@ -195,6 +196,7 @@ struct SynthXilinxPass : public ScriptPass continue; } if (args[argidx] == "-retime") { + dff_mode = true; retime = true; continue; } @@ -542,7 +544,7 @@ struct SynthXilinxPass : public ScriptPass if (flatten_before_abc) run("flatten"); if (help_mode) - run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(option for 'nowidelut'; option for '-retime')"); + run("abc -luts 2:2,3,6:5[,10,20] [-dff] [-D 1]", "(option for 'nowidelut', '-dff', '-retime')"); else if (abc9) { if (family != "xc7") log_warning("'synth_xilinx -abc9' not currently supported for the '%s' family, " @@ -565,10 +567,16 @@ struct SynthXilinxPass : public ScriptPass run("techmap -map +/xilinx/abc9_unmap.v"); } else { + std::string abc_opts; if (nowidelut) - run("abc -luts 2:2,3,6:5" + string(retime ? " -dff -D 1" : "")); + abc_opts += " -luts 2:2,3,6:5"; else - run("abc -luts 2:2,3,6:5,10,20" + string(retime ? " -dff -D 1" : "")); + abc_opts += " -luts 2:2,3,6:5,10,20"; + if (dff_mode) + abc_opts += " -dff"; + if (retime) + abc_opts += " -D 1"; + run("abc" + abc_opts); } run("clean"); @@ -581,7 +589,7 @@ struct SynthXilinxPass : public ScriptPass techmap_args += stringf("[-map %s]", ff_map_file.c_str()); else if (!abc9) techmap_args += stringf(" -map %s", ff_map_file.c_str()); - run("techmap " + techmap_args, "(option without '-abc9')"); + run("techmap " + techmap_args, "(only if '-abc9')"); run("xilinx_dffopt"); } |