diff options
| author | Pavel V. Shatov (Meister) <meisterpaul1@yandex.ru> | 2019-10-21 12:46:22 +0300 |
|---|---|---|
| committer | Pavel V. Shatov (Meister) <meisterpaul1@yandex.ru> | 2019-10-21 12:46:22 +0300 |
| commit | 3213b3ef3c1d40dfa416b6be409cfa3d15af0930 (patch) | |
| tree | f776ddb5b44a9f9e4f1b2b9da56a4b645570fdb1 /rtl/modexpng_microcode.vh | |
| parent | 1e3303286bdb0d400d78d9d8b0aa90b29949c4a3 (diff) | |
Added "MERGE_LH" micro-operation. To be able to do Garner's formula we need
regular (not modular) multiplication. We're doing this by telling the modular
multiplier to stop after the "square" step, which computes A*B. The problem is
that the multiplier stores the lower part of the product in the internal bank L
and the upper part in the internal bank H, but we need to be able to do
operations on the product as a whole. MERGE_LH that combines the two halves of
the product into one bank.
Diffstat (limited to 'rtl/modexpng_microcode.vh')
| -rw-r--r-- | rtl/modexpng_microcode.vh | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/rtl/modexpng_microcode.vh b/rtl/modexpng_microcode.vh index 3493e26..47cdeb2 100644 --- a/rtl/modexpng_microcode.vh +++ b/rtl/modexpng_microcode.vh @@ -78,6 +78,10 @@ localparam [UOP_OPCODE_W -1:0] UOP_OPCODE_PROPAGATE_CARRIES = 5'd12; * source and destination WIDE are don't care */ +localparam [UOP_OPCODE_W -1:0] UOP_OPCODE_MERGE_LH = 5'd13; + +localparam [UOP_OPCODE_W -1:0] UOP_OPCODE_REGULAR_MULTIPLY = 5'd14; + localparam [UOP_OPCODE_W -1:0] UOP_OPCODE_LADDER_INIT = 5'd16; localparam [UOP_OPCODE_W -1:0] UOP_OPCODE_LADDER_STEP = 5'd17; /* CRT is don't care |