Replacing hand instantiated synchronizer flops

[nstewart-amd]

re: module rvsyncss, module rvsyncss_fpga

"lib/beh_lib.sv"

1. Why do we have a multibit wide synchronizer with no handshake mechanism? You can't reliably synchronize a multibit bus unless it's grey-coded.

2. A single bit synchronizer must be of configurable depth and/or readily replaceable by integrator specific synchronizers.
   2-bit depth synchronizers may not comply with integrator/foundry design rules or practice.

Recommendation: Add define for synchronizer depth and/or define for ready replacement of the synchronizers by the integrator.

[algrobman]

these were meant to "bungle" independent wires to reduce code typing . they are instantiating dual flop synchronizer modules, which can be replaced by a physical library cell.