(1) Changing key memory to be based on bytes. (2) Adding API commands ands status values for operating the memory.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/rtl/fpga_mkm.v b/src/rtl/fpga_mkm.v
index e0dc14a..89825ed 100644
--- a/src/rtl/fpga_mkm.v
+++ b/src/rtl/fpga_mkm.v
@@ -68,13 +68,21 @@ module fpga_mkm(
   localparam CTRL_DONE  = 3;
 
 
-  localparam MEM_WORDS = 16;
+  localparam MEM_BYTES = 32;
+
+  localparam CMD_WRITE_BYTES = 8'h37;
+  localparam CMD_READ_BYTES  = 8'h93;
+  localparam CMD_GET_STATUS  = 8'hca;
+
+  localparam STAT_KEY_NOT_LOADED  = 8'hdb;
+  localparam STAT_KEY_LOADED      = 8'hbd;
+  localparam STAT_TAMPER_DETECTED = 8'ha5;
 
 
   //----------------------------------------------------------------
   // Registers including update variables and write enable.
   //----------------------------------------------------------------
-  reg [31 : 0] key_mem [0 : (MEM_WORDS - 1)];
+  reg [7 : 0] key_mem [0 : (MEM_BYTES - 1)];
 
   reg [21 : 0] alarm_counter_reg = 22'h0;