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-rw-r--r--passes/pmgen/xilinx_dsp.pmg2
1 files changed, 2 insertions, 0 deletions
diff --git a/passes/pmgen/xilinx_dsp.pmg b/passes/pmgen/xilinx_dsp.pmg
index c2bec4c54..7a175123e 100644
--- a/passes/pmgen/xilinx_dsp.pmg
+++ b/passes/pmgen/xilinx_dsp.pmg
@@ -11,6 +11,7 @@ match ffA
select ffA->type.in($dff, $dffe)
// DSP48E1 does not support clock inversion
select param(ffA, \CLK_POLARITY).as_bool()
+ filter !port(dsp, \A).remove_const().empty()
filter includes(port(ffA, \Q).to_sigbit_set(), port(dsp, \A).remove_const().to_sigbit_set())
optional
endmatch
@@ -24,6 +25,7 @@ match ffB
select ffB->type.in($dff, $dffe)
// DSP48E1 does not support clock inversion
select param(ffB, \CLK_POLARITY).as_bool()
+ filter !port(dsp, \B).remove_const().empty()
filter includes(port(ffB, \Q).to_sigbit_set(), port(dsp, \B).remove_const().to_sigbit_set())
optional
endmatch