added constrain template

2018-11-29 14:07:45 +01:00
parent 6b512782f3
commit da6ab3236a
1 changed files with 6 additions and 0 deletions
--- a/constraints/eevr.ucf
+++ b/constraints/eevr.ucf
@ -0,0 +1,6 @@
+# FIFO clock crossing for streaming interface:
+# constrain to have less delay than one clock cycle of the faster clock:
+
+set_max_delay -datapath_only -from <ClkA> -to <ClkB> <faster_clock_period>
+set_max_delay -datapath_only -from <ClkB> -to <ClkA> <faster_clock_period>
+