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-rw-r--r--src/rtl/keywrap.v18
1 files changed, 17 insertions, 1 deletions
diff --git a/src/rtl/keywrap.v b/src/rtl/keywrap.v
index 885578b..6a28133 100644
--- a/src/rtl/keywrap.v
+++ b/src/rtl/keywrap.v
@@ -47,12 +47,28 @@ module keywrap(
input wire we,
// Data ports.
- input wire [7 : 0] address,
+ input wire [(ASPACE - 1) : 0] address,
input wire [31 : 0] write_data,
output wire [31 : 0] read_data,
output wire error
);
+ //----------------------------------------------------------------
+ // External parameters
+ //----------------------------------------------------------------
+ // Since $clog2() is not supported by all tools, and constant
+ // functions are not supported by some other tools we need to
+ // do the size to number of bits calculation by hand.
+ // 8192 bytes = 2048 32 bit words. This requires 11 bits.
+ // We need additional space for control and status words. But
+ // since we have filled the address space, we need another MSB
+ // in the address - 12 bits.
+ //
+ // 0x000 - 0x7ff are for control and status.
+ // 0x800 - 0xfff are for data storage
+ parameter ASPACE = 12;
+ localparam MEM_SPACE = (ASPACE / 2);
+
//----------------------------------------------------------------
// Internal constant and parameter definitions.