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-rw-r--r--techlibs/ice40/synth_ice40.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/techlibs/ice40/synth_ice40.cc b/techlibs/ice40/synth_ice40.cc
index ed7a16c08..463c2063a 100644
--- a/techlibs/ice40/synth_ice40.cc
+++ b/techlibs/ice40/synth_ice40.cc
@@ -65,7 +65,7 @@ struct SynthIce40Pass : public ScriptPass
log(" do not flatten design before synthesis\n");
log("\n");
log(" -retime\n");
- log(" run 'abc' with -dff option\n");
+ log(" run 'abc' with '-dff -D 1' options\n");
log("\n");
log(" -nocarry\n");
log(" do not use SB_CARRY cells in output netlist\n");
@@ -316,7 +316,7 @@ struct SynthIce40Pass : public ScriptPass
run("techmap -map +/techmap.v -map +/ice40/arith_map.v");
}
if (retime || help_mode)
- run(abc + " -dff", "(only if -retime)");
+ run(abc + " -dff -D 1", "(only if -retime)");
run("ice40_opt");
}