mock area: scale die area, keep die to core margin

fixes problems with not enough space for PDN

Signed-off-by: Øyvind Harboe <[email protected]>

BUILD

@@ -111,7 +111,7 @@ LB_VERILOG_FILES = ["test/mock/lb_32x128.sv"]
 orfs_flow(
     name = "lb_32x128",
     arguments = LB_ARGS,
-    mock_area = 0.90,
+    mock_area = 0.7,
     stage_sources = LB_STAGE_SOURCES,
     verilog_files = LB_VERILOG_FILES,
 )

mock_area.tcl

@@ -13,10 +13,20 @@ set die_bbox [$block getDieArea]
 set core_bbox [$block getCoreArea]
 set scale [expr $::env(MOCK_AREA) / $dbu_per_uu]
 
+proc area_um {bbox} {
+  global dbu_per_uu
+  return "[expr [$bbox xMin] / $dbu_per_uu] [expr [$bbox yMin] / $dbu_per_uu] [expr [$bbox xMax] / $dbu_per_uu] [expr [$bbox yMax] / $dbu_per_uu]"
+}
+
+puts "DIE_AREA: [area_um $die_bbox]"
+puts "CORE_AREA: [area_um $core_bbox]"
+
 set file [open $out_file w]
 tee $file "export DIE_AREA=0 0 [expr $scale*[$die_bbox xMax]] [expr $scale*[$die_bbox yMax]]"
-tee $file "export CORE_AREA=[expr $scale*[$core_bbox xMin]] [expr $scale*[$core_bbox yMin]]\
-[expr $scale*([$die_bbox xMax] - ([$die_bbox xMax] - [$core_bbox xMax]))]\
-[expr $scale*([$die_bbox yMax] - ([$die_bbox yMax] - [$core_bbox yMax]))]"
+# keep same margin between DIE_ARE and CORE_AREA
+tee $file "export CORE_AREA=[expr ([$core_bbox xMin] - [$die_bbox xMin]) / $dbu_per_uu] \
+ [expr ([$core_bbox yMin] - [$die_bbox yMin]) / $dbu_per_uu] \
+ [expr $scale*[$die_bbox xMax] - ([$die_bbox xMax] - [$core_bbox xMax]) / $dbu_per_uu ] \
+ [expr $scale*[$die_bbox yMax] - ([$die_bbox yMax] - [$core_bbox yMax]) / $dbu_per_uu]"
 tee $file "export CORE_UTILIZATION="
 close $file