diff options
Diffstat (limited to 'src/rtl/keywrap.v')
| -rw-r--r-- | src/rtl/keywrap.v | 18 |
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. |