mock-array: improve clock skew

use Louii's halo x/y feature and the tip from Matt

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/designs/asap7/mock-array/config.mk

@@ -54,3 +54,7 @@ export MAX_ROUTING_LAYER = M7
 
 # works with 28 or more iterations as of writing, so give it a few more.
 export GLOBAL_ROUTE_ARGS=-congestion_iterations 40 -verbose
+
+# ensure we have some rows, so we don't get a bad clock skew.
+export MACRO_HALO_X            = 1
+export MACRO_HALO_Y            = 1