use 0.23 as place density

Signed-off-by: Eder Monteiro <[email protected]>

Author: eder-matheus

flow/designs/sky130hd/microwatt/config.mk

@@ -11,7 +11,7 @@ export SDC_FILE      = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint.
 export DIE_AREA   = 0 0 2920 3520
 export CORE_AREA  = 10 10 2910 3510
 
-export PLACE_DENSITY ?= 0.5
+export PLACE_DENSITY ?= 0.23
 
 export microwatt_DIR = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)