[otbn] Correct data_i width into dmem integrity check
Previously the full 312-bit dmem read data signal was fed into all
integrity checkers. It should be seperate 39-bit integrity granules.
Fixes #6612
Signed-off-by: Greg Chadwick <gac@lowrisc.org>
diff --git a/hw/ip/otbn/rtl/otbn.sv b/hw/ip/otbn/rtl/otbn.sv
index 2e8c204..e41955c 100644
--- a/hw/ip/otbn/rtl/otbn.sv
+++ b/hw/ip/otbn/rtl/otbn.sv
@@ -343,7 +343,7 @@
// have functionality for only integrity checking, just fully integrated ECC. Integrity bits are
// implemented on a 32-bit granule so seperate checks are required for each.
prim_secded_39_32_dec u_dmem_intg_check (
- .data_i (dmem_rdata),
+ .data_i (dmem_rdata[i_word*39 +: 39]),
.data_o (),
.syndrome_o (),
.err_o (dmem_rerror_raw)
