- Update README

- Increase clock period in sky130hd/gcd/default_constraint.sdc
- In two_phase_clk_synth.tcl
  - Use mode 5 for retiming instead of mode 4
  - Call zero command again

Author: leeway64

README.md

@@ -47,7 +47,7 @@ timeline
 ## Running ORFS with two-phase clocking with latches
 
 ```
-make DESIGN_CONFIG=./designs/sky130hd/gcd/config.mk .DEFAULT_GOAL=place MODE=two_phase_clk | tee orfs.log
+time make DESIGN_CONFIG=./designs/sky130hd/gcd/config.mk .DEFAULT_GOAL=place MODE=two_phase_clk | tee orfs.log
 ```
 
 ## Running static timing analysis

flow/designs/sky130hd/gcd/default_constraint.sdc

@@ -2,7 +2,7 @@ current_design gcd
 
 set clk_name core_clock
 set clk_port_name clk
-set clk_period [expr 3 * 1.1]
+set clk_period [expr 4 * 1.1]
 set clk_io_pct 0.2
 
 set clk_port [get_ports $clk_port_name]

flow/scripts/two_phase_clk_synth.tcl

@@ -110,7 +110,7 @@ connect_clk *custom_FF_replace_1.mux_latch C clk_2
 design -save pre_retiming
 
 puts "Perform retiming"
-abc -keepff -dff -markgroups -script "+strash; zero; &get -n; print_latch; &fraig -x; &put; scorr; dc2; dretime -v; retime -M 4 -D 1 -o -v; strash; &get -n; &dch -f; &nf -D 1; &put"
+abc -keepff -dff -markgroups -script "+strash; zero; &get -n; print_latch; &fraig -x; &put; scorr; dc2; dretime -v; retime -M 5 -D 1 -o -v; strash; zero; &get -n; &dch -f; &nf -D 1; &put"
 opt -noff -purge
 
 design -save post_retiming