openroad: add initial parasitic extraction

Author: phsauter

Makefile

@@ -25,11 +25,18 @@ default: help
 ################
 # Dependencies #
 ################
+# Download RCX file used for parasitic extraction from ORFS (configuration got ok by IHP)
+IHP_RCX_URL  := "https://raw.githubusercontent.com/The-OpenROAD-Project/OpenROAD-flow-scripts/7747f88f70daaeb63f43ce36e71829707b7e3fa7/flow/platforms/ihp-sg13g2/IHP_rcx_patterns.rules"
+IHP_RCX_FILE := $(PROJ_DIR)/openroad/IHP_rcx_patterns.rules
+
 ## Checkout/update dependencies using Bender
-checkout:
+checkout: $(IHP_RCX_FILE)
 	$(BENDER) checkout
 	git submodule update --init --recursive
 
+$(IHP_RCX_FILE): 
+	curl -L -o $@ $(IHP_RCX_URL)
+
 ## Reset dependencies (without updating Bender.lock)
 clean-deps:
 	rm -rf .bender

openroad/.gitignore

@@ -1,4 +1,5 @@
 *.log
 save
 reports
-out
+out
+IHP_rcx_patterns.rules

openroad/openroad.mk

@@ -29,7 +29,7 @@ backend: $(OR_OUT)/$(PROJ_NAME).def
 openroad: $(OR_OUT)/$(PROJ_NAME).def
 
 ## Place & Route flow using OpenROAD
-$(OR_OUT_FILES): $(NETLIST) $(OR_DIR)/scripts/*.tcl $(OR_DIR)/src/*.tcl $(OR_DIR)/src/*.sdc
+$(OR_OUT_FILES): $(NETLIST) $(OR_DIR)/scripts/*.tcl $(OR_DIR)/src/*.tcl $(OR_DIR)/src/*.sdc $(OR_DIR)/IHP_rcx_patterns.rules
 	mkdir -p $(SAVE)
 	mkdir -p $(REPORTS)
 	mkdir -p $(OR_OUT)

openroad/scripts/chip.tcl

@@ -272,7 +272,7 @@ utl::report "Perform buffer insertion..."
 repair_design -verbose
 utl::report "Repair setup and hold violations..."
 repair_timing -skip_pin_swap -setup -verbose -repair_tns 100
-repair_timing -skip_pin_swap -hold -hold_margin 0.05 -verbose -repair_tns 100
+repair_timing -skip_pin_swap -hold -hold_margin 0.1 -verbose -repair_tns 100
 
 utl::report "GRT incremental..."
 # Run to get modified net by DPL
@@ -334,8 +334,12 @@ filler_placement $stdfill
 global_connect
 
 save_checkpoint ${log_id_str}_${proj_name}.final
-report_metrics "${log_id_str}_${proj_name}.final"
 report_image "${log_id_str}_${proj_name}.final" true true false true
+define_process_corner -ext_model_index 0 X
+extract_parasitics -ext_model_file IHP_rcx_patterns.rules
+write_spef out/${proj_name}.spef
+read_spef  out/${proj_name}.spef; # readback parasitics for OpenSTA
+report_metrics "${log_id_str}_${proj_name}.final"
 
 utl::report "Write output"
 write_def                      out/${proj_name}.def