commit 4d3d45250b0430b0494b71918dceedd903aa8b0e
author Cindy Chen <chencindy@opentitan.org> Mon Jul 18 10:20:31 2022 -0700
committer Cindy Chen <cindy.chen0316@gmail.com> Mon Jul 18 13:14:35 2022 -0700
tree 5ee3c111278703d9b39baf12f36cd91418a6394c
parent b661fb6b73d30758e1c893bdc49e55ec44ac7401

[fpv/kmac] Fix shadow reg assertion error

When shadow reg assertion error happens, kmac entropy will go to FSM
error state and drop the entropy request without waiting for an entropy
response.
This will cause an assertion error. To avoid this error, I modify the
RTL to disable the assertion check when FSM error state is high.

Signed-off-by: Cindy Chen <chencindy@opentitan.org>

hw/ip/kmac/rtl/kmac.sv

diff --git a/hw/ip/kmac/rtl/kmac.sv b/hw/ip/kmac/rtl/kmac.sv
index 59f70bc..24fd4e6 100644
--- a/hw/ip/kmac/rtl/kmac.sv
+++ b/hw/ip/kmac/rtl/kmac.sv
@@ -1104,7 +1104,7 @@
       .rst_src_ni(rst_ni),
       .clk_dst_i (clk_edn_i),
       .rst_dst_ni(rst_edn_ni),
-      .req_chk_i (1'b1),
+      .req_chk_i (kmac_entropy_state_error == 1'b0),
       .src_req_i (entropy_req),
       .src_ack_o (entropy_ack),
       .dst_req_o (entropy_o.edn_req),