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Add "synth_ice40 -nodffe" 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2018-04-16 20:44:26 +02:00
parent 5ca91ca019
commit 81a457c4a6
1 changed files with 11 additions and 2 deletions
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13
techlibs/ice40/synth_ice40.cc
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@ -62,6 +62,9 @@ struct SynthIce40Pass : public ScriptPass
log(" -nocarry\n"); log(" -nocarry\n");
log(" do not use SB_CARRY cells in output netlist\n"); log(" do not use SB_CARRY cells in output netlist\n");
log("\n"); log("\n");
log(" -nodffe\n");
log(" do not use SB_DFFE* cells in output netlist\n");
log("\n");
log(" -nobram\n"); log(" -nobram\n");
log(" do not use SB_RAM40_4K* cells in output netlist\n"); log(" do not use SB_RAM40_4K* cells in output netlist\n");
log("\n"); log("\n");
@ -79,7 +82,7 @@ struct SynthIce40Pass : public ScriptPass
} }
string top_opt, blif_file, edif_file; string top_opt, blif_file, edif_file;
bool nocarry, nobram, flatten, retime, abc2, vpr; bool nocarry, nodffe, nobram, flatten, retime, abc2, vpr;
virtual void clear_flags() YS_OVERRIDE virtual void clear_flags() YS_OVERRIDE
{ {
@ -87,6 +90,7 @@ struct SynthIce40Pass : public ScriptPass
blif_file = ""; blif_file = "";
edif_file = ""; edif_file = "";
nocarry = false; nocarry = false;
nodffe = false;
nobram = false; nobram = false;
flatten = true; flatten = true;
retime = false; retime = false;
@ -138,6 +142,10 @@ struct SynthIce40Pass : public ScriptPass
nocarry = true; nocarry = true;
continue; continue;
} }
if (args[argidx] == "-nodffe") {
nodffe = true;
continue;
}
if (args[argidx] == "-nobram") { if (args[argidx] == "-nobram") {
nobram = true; nobram = true;
continue; continue;
@ -209,7 +217,8 @@ struct SynthIce40Pass : public ScriptPass
if (check_label("map_ffs")) if (check_label("map_ffs"))
{ {
run("dffsr2dff"); run("dffsr2dff");
run("dff2dffe -direct-match $_DFF_*"); if (!nodffe)
run("dff2dffe -direct-match $_DFF_*");
run("techmap -D NO_SB_LUT4 -map +/ice40/cells_map.v"); run("techmap -D NO_SB_LUT4 -map +/ice40/cells_map.v");
run("opt_expr -mux_undef"); run("opt_expr -mux_undef");
run("simplemap"); run("simplemap");