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-rw-r--r--ecp5/arch.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/ecp5/arch.cc b/ecp5/arch.cc
index 9da8abdf..a27b0860 100644
--- a/ecp5/arch.cc
+++ b/ecp5/arch.cc
@@ -512,7 +512,7 @@ bool Arch::place()
if (placer == "heap") {
PlacerHeapCfg cfg(getCtx());
- cfg.criticalityExponent = 7;
+ cfg.criticalityExponent = 4;
cfg.ioBufTypes.insert(id_TRELLIS_IO);
if (!placer_heap(getCtx(), cfg))
return false;