Merge pull request #3343 from Pinata-Consulting/asap7-max-delay-sans-clock-delay

asap7: constraints.sdc max delay excludes clock latency

Author: maliberty

flow/designs/asap7/mock-array/rules-base.json

@@ -1,6 +1,6 @@
 {
     "synth__design__instance__area__stdcell": {
-        "value": 35273.33,
+        "value": 34554.19,
         "compare": "<="
     },
     "constraints__clocks__count": {
@@ -48,23 +48,23 @@
         "compare": "<="
     },
     "finish__timing__setup__ws": {
-        "value": -457.76,
+        "value": -89.95,
         "compare": ">="
     },
     "finish__design__instance__area": {
         "value": 137967,
         "compare": "<="
     },
     "finish__timing__drv__setup_violation_count": {
-        "value": 605,
+        "value": 536,
         "compare": "<="
     },
     "finish__timing__drv__hold_violation_count": {
         "value": 100,
         "compare": "<="
     },
     "finish__timing__wns_percent_delay": {
-        "value": -111.1,
+        "value": -31.9,
         "compare": ">="
     }
 }

flow/platforms/asap7/constraints.sdc

@@ -74,11 +74,13 @@ set non_clk_inputs [all_inputs -no_clocks]
 # Optimization targets: overconstrain by default and
 # leave refinements to a more design specific constraints.sdc file.
 #
-# Minimum time for io-io, io-reg, reg-io paths in macro is on
-# the order of 80ps for a small macro on ASAP7.
-set_max_delay [expr { [info exists in2reg_max] ? $in2reg_max : 80 }] -from $non_clk_inputs \
+# Minimum time, excluding clock latency, for io-io, io-reg, reg-io
+# paths in macro is on the order of 80ps for a small macro on ASAP7.
+set_max_delay -ignore_clock_latency \
+  [expr { [info exists in2reg_max] ? $in2reg_max : 80 }] -from $non_clk_inputs \
   -to [all_registers]
-set_max_delay [expr { [info exists reg2out_max] ? $reg2out_max : 80 }] -from [all_registers] \
+set_max_delay -ignore_clock_latency \
+  [expr { [info exists reg2out_max] ? $reg2out_max : 80 }] -from [all_registers] \
   -to [all_outputs]
 set_max_delay [expr { [info exists in2out_max] ? $in2out_max : 80 }] -from $non_clk_inputs \
   -to [all_outputs]