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authorJoachim StroĢˆmbergson <joachim@secworks.se>2018-09-18 11:19:30 +0200
committerJoachim StroĢˆmbergson <joachim@secworks.se>2018-09-18 11:19:30 +0200
commit50bc6e775d7a2a4ad75511c43af93759cc6b09c4 (patch)
treedb4580c0861192a22ce2b2d793d6cd785eb1832d /src/rtl
parent00fd27b23e578f5c92d856951645805be5dbab1a (diff)
Moved compile time debug access control of key to the API. Added correct code to mux key.
Diffstat (limited to 'src/rtl')
-rw-r--r--src/rtl/keywrap.v15
-rw-r--r--src/rtl/keywrap_core.v3
2 files changed, 11 insertions, 7 deletions
diff --git a/src/rtl/keywrap.v b/src/rtl/keywrap.v
index 5604ce4..786ab54 100644
--- a/src/rtl/keywrap.v
+++ b/src/rtl/keywrap.v
@@ -108,6 +108,11 @@ module keywrap #(parameter ADDR_BITS = 13)
localparam PAD = ADDR_BITS - 8;
+ // If set to one, will allow read access to key memory.
+ // Should be set to zero in all production FPGA bitstreams.
+ localparam DEBUG_MKM_READ = 1'h1;
+
+
//----------------------------------------------------------------
// Registers including update variables and write enable.
//----------------------------------------------------------------
@@ -341,10 +346,12 @@ module keywrap #(parameter ADDR_BITS = 13)
if (address == {{PAD{1'h0}}, ADDR_A1})
api_rd_delay_new = core_a_result[31 : 0];
- // Not correct read key mux.
- if ((address >= {{PAD{1'h0}}, ADDR_KEY0}) &&
- (address <= {{PAD{1'h0}}, ADDR_KEY7}))
- api_rd_delay_new = core_read_key[031 : 000];
+ // Warning: Should be disabled after mkmif
+ // integration has been completed.
+ if (DEBUG_MKM_READ)
+ if ((address >= {{PAD{1'h0}},ADDR_KEY0}) && (address <= {{PAD{1'h0}}, ADDR_KEY7}))
+ api_rd_delay_new = core_read_key[(7 - (address - {{PAD{1'h0}}, ADDR_KEY7})) * 32 +: 32];
+
end // else: !if(we)
end // if (cs)
end // block: api
diff --git a/src/rtl/keywrap_core.v b/src/rtl/keywrap_core.v
index e9a7177..6810307 100644
--- a/src/rtl/keywrap_core.v
+++ b/src/rtl/keywrap_core.v
@@ -90,9 +90,6 @@ module keywrap_core #(parameter MEM_BITS = 11)
localparam CTRL_NEXT_UCHECK = 4'h9;
localparam CTRL_NEXT_FINALIZE = 4'ha;
- // If set to one, will allow read access to key memory.
- localparam DEBUG_MKM_READ = 1'h1;
-
//----------------------------------------------------------------
// Registers and memories including control signals.