diff options
Diffstat (limited to 'techlibs/xilinx')
| -rw-r--r-- | techlibs/xilinx/synth_xilinx.cc | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index 4f02a47ea..f59c0c622 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -269,8 +269,15 @@ struct SynthXilinxPass : public Pass Pass::call(design, "dff2dffe"); if (!nosrl) { + // shregmap operates on bit-level flops, not word-level, + // so break those down here Pass::call(design, "simplemap t:$dff t:$dffe"); + // shregmap -tech xilinx can cope with $shiftx and $mux + // cells for identifiying variable-length shift registers, + // so attempt to convert $pmux-es to the former Pass::call(design, "pmux2shiftx"); + // pmux2shiftx can leave behind a $pmux with a single entry + // -- need this to clean that up Pass::call(design, "opt_expr -mux_undef"); Pass::call(design, "shregmap -tech xilinx -minlen 3"); } |