commit 8cf1097b7c2ebd89d9fafe54c94e25aa3b51c740
author Michael Tempelmeier <michael.tempelmeier@gi-de.com> Thu Feb 10 14:00:27 2022 +0100
committer Michael Schaffner <msf@google.com> Wed Feb 16 17:13:03 2022 -0800
tree 54b25253a12ab331f9c7cdf34a71090db542ed7f
parent 05bc1810c2279a11461ed661d081eb843b81c163

[kmac] gated TL state output

Signed-off-by: Michael Tempelmeier <michael.tempelmeier@gi-de.com>

hw/ip/kmac/rtl/kmac.sv

diff --git a/hw/ip/kmac/rtl/kmac.sv b/hw/ip/kmac/rtl/kmac.sv
index 9987937..19a4b6d 100644
--- a/hw/ip/kmac/rtl/kmac.sv
+++ b/hw/ip/kmac/rtl/kmac.sv
@@ -184,7 +184,7 @@
 
   // state is de-muxed in keymgr interface logic.
   // the output from keymgr logic goes into staterd module to be visible to SW
-  logic unused_reg_state_valid;
+  logic reg_state_valid;
   logic [sha3_pkg::StateW-1:0] reg_state [Share];
 
   // SHA3 Entropy interface
@@ -990,7 +990,7 @@
     .keccak_state_i       (state),
 
     // to STATE TL Window
-    .reg_state_valid_o    (unused_reg_state_valid),
+    .reg_state_valid_o    (reg_state_valid),
     .reg_state_o          (reg_state),
 
     // Configuration: Sideloaded Key
@@ -1045,6 +1045,13 @@
     .process_o (msgfifo2kmac_process)
   );
 
+  logic [sha3_pkg::StateW-1:0] reg_state_tl [Share];
+  always_comb begin
+    for (int i = 0 ; i < Share; i++) begin
+      reg_state_tl[i] = reg_state_valid ? reg_state[i] : 'b0;
+    end
+  end
+
   // State (Digest) reader
   kmac_staterd #(
     .AddrW     (9), // 512B
@@ -1056,7 +1063,7 @@
     .tl_i (tl_win_h2d[WinState]),
     .tl_o (tl_win_d2h[WinState]),
 
-    .state_i (reg_state),
+    .state_i (reg_state_tl),
 
     .endian_swap_i (reg2hw.cfg_shadowed.state_endianness.q)
   );