Add new timing endpoint breakdown fields to the

ppa proto.

Signed-off-by: Mike Inouye <mikeinouye@google.com>

synthesis/power_performance_area.proto

@@ -118,16 +118,26 @@ message Performance {
   // Approximate invariant:
   //   clock_period_ps - critical_path_ps = setup_wns_ps
 
-  // If negative, not enough time to have data ready for DFF to take data, i.e.
-  // the combinational path that exceeds that time the most.
+  // A negative value indicates that the data is not available in time at the
+  // endpoint to properly sample the value. A zero value indicates
+  // that timing is met - positive values are atypical but can be used to report
+  // margin. These values are the worst of in2reg, reg2reg, reg2out, and in2out.
   optional sint32 setup_wns_ps = 3;
   optional sint64 setup_tns_ps = 4;
 
-  // If negative, new data arrives too early for the DFF to ingest
-  // the previous one reliably.
+  // A negative value indicates that new data arrives too early for the
+  // endpoint to properly sample the previous value. A zero value indicates
+  // that timing is met - positive values are atypical but can be used to report
+  // margin. These values are the worst of in2reg, reg2reg, reg2out, and in2out.
   optional sint32 hold_wns_ps = 5;
   optional sint64 hold_tns_ps = 6;
 
+  // Additional timing breakdowns for in2reg, reg2reg, reg2out, and in2out.
+  optional TimingBreakdown in2reg = 20;
+  optional TimingBreakdown reg2reg = 21;
+  optional TimingBreakdown reg2out = 22;
+  optional TimingBreakdown in2out = 22;
+
   // How far off the clock is between two different parts of the chip.
   optional sint32 clock_skew_ps = 7;
 
@@ -147,6 +157,15 @@ message Performance {
   optional int32 critical_path_cells = 16;
 }
 
+message TimingBreakdown {
+  // See `setup_wns_ps` and `setup_tns_ps` descriptions for details.
+  optional sint32 setup_wns_ps = 1;
+  optional sint64 setup_tns_ps = 2;
+  // See `hold_wns_ps` and `hold_tns_ps` descriptions for details.
+  optional sint32 hold_wns_ps = 3;
+  optional sint64 hold_tns_ps = 4;
+}
+
 message Power {
   // The total power. Typically the sum of all of the below,
   // but could be more if not all summands are mentioned below.