For ng45/ariane136 use -signature_net_threshold 30

fakeram45_256x16 has 58 pins so the default threshold of 50 is too
high.  This is a stop-gap solution as we need a smarter way to do
thresholding.

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

flow/designs/nangate45/ariane136/config.mk

@@ -10,6 +10,7 @@ export RTLMP_MAX_INST = 30000
 export RTLMP_MIN_INST = 5000
 export RTLMP_MAX_MACRO = 16
 export RTLMP_MIN_MACRO = 4
+export RTLMP_SIGNATURE_NET_THRESHOLD = 30
 
 export VERILOG_FILES = ./designs/src/$(DESIGN_NICKNAME)/ariane.sv2v.v \
                        ./designs/$(PLATFORM)/$(DESIGN_NICKNAME)/macros.v

flow/scripts/macro_place_util.tcl

@@ -78,6 +78,10 @@ if {[find_macros] != ""} {
     if { [info exists ::env(RTLMP_MIN_AR)]} {
         append additional_rtlmp_args " -min_ar $env(RTLMP_MIN_AR)"
     }
+    if { [info exists ::env(RTLMP_SIGNATURE_NET_THRESHOLD)]} {
+        append additional_rtlmp_args \
+            " -signature_net_threshold $env(RTLMP_SIGNATURE_NET_THRESHOLD)"
+    }
     if { [info exists ::env(RTLMP_AREA_WT)]} {
         append additional_rtlmp_args " -area_weight $env(RTLMP_AREA_WT)"
     }