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_mmm_dual.v | |
| 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_mmm_dual.v')
| -rw-r--r-- | rtl/modexpng_mmm_dual.v | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/rtl/modexpng_mmm_dual.v b/rtl/modexpng_mmm_dual.v index 6e52a97..13a8773 100644 --- a/rtl/modexpng_mmm_dual.v +++ b/rtl/modexpng_mmm_dual.v @@ -9,6 +9,7 @@ module modexpng_mmm_dual word_index_last_minus1, force_unity_b, only_reduce, + just_multiply, sel_wide_in, sel_narrow_in, @@ -74,6 +75,7 @@ module modexpng_mmm_dual input [7:0] word_index_last_minus1; input force_unity_b; input only_reduce; + input just_multiply; input [BANK_ADDR_W-1:0] sel_wide_in; input [BANK_ADDR_W-1:0] sel_narrow_in; @@ -127,6 +129,7 @@ module modexpng_mmm_dual wire [FSM_STATE_WIDTH-1:0] fsm_state_after_mult_square; wire [FSM_STATE_WIDTH-1:0] fsm_state_after_mult_triangle; wire [FSM_STATE_WIDTH-1:0] fsm_state_after_mult_rectangle; + wire [FSM_STATE_WIDTH-1:0] fsm_state_after_square_holdoff; // @@ -911,7 +914,9 @@ module modexpng_mmm_dual assign fsm_state_after_idle = !only_reduce ? FSM_STATE_MULT_SQUARE_COL_0_INIT : FSM_STATE_MULT_TRIANGLE_COL_0_INIT; assign fsm_state_after_mult_square = col_is_last ? FSM_STATE_MULT_SQUARE_HOLDOFF : FSM_STATE_MULT_SQUARE_COL_N_INIT; assign fsm_state_after_mult_triangle = col_is_last ? FSM_STATE_MULT_TRIANGLE_HOLDOFF : FSM_STATE_MULT_TRIANGLE_COL_N_INIT; - assign fsm_state_after_mult_rectangle = col_is_last ? FSM_STATE_MULT_RECTANGLE_HOLDOFF : FSM_STATE_MULT_RECTANGLE_COL_N_INIT; + assign fsm_state_after_mult_rectangle = col_is_last ? FSM_STATE_MULT_RECTANGLE_HOLDOFF : FSM_STATE_MULT_RECTANGLE_COL_N_INIT; + assign fsm_state_after_square_holdoff = just_multiply ? FSM_STATE_STOP : FSM_STATE_MULT_TRIANGLE_COL_0_INIT; + always @* begin // @@ -928,7 +933,7 @@ module modexpng_mmm_dual FSM_STATE_MULT_SQUARE_COL_N_TRIG: fsm_state_next = FSM_STATE_MULT_SQUARE_COL_N_BUSY ; FSM_STATE_MULT_SQUARE_COL_N_BUSY: fsm_state_next = square_done ? fsm_state_after_mult_square : FSM_STATE_MULT_SQUARE_COL_N_BUSY; - FSM_STATE_MULT_SQUARE_HOLDOFF: fsm_state_next = rcmb_rdy ? FSM_STATE_MULT_TRIANGLE_COL_0_INIT : FSM_STATE_MULT_SQUARE_HOLDOFF; + FSM_STATE_MULT_SQUARE_HOLDOFF: fsm_state_next = rcmb_rdy ? fsm_state_after_square_holdoff : FSM_STATE_MULT_SQUARE_HOLDOFF; FSM_STATE_MULT_TRIANGLE_COL_0_INIT: fsm_state_next = FSM_STATE_MULT_TRIANGLE_COL_0_TRIG ; FSM_STATE_MULT_TRIANGLE_COL_0_TRIG: fsm_state_next = FSM_STATE_MULT_TRIANGLE_COL_0_BUSY ; @@ -952,9 +957,9 @@ module modexpng_mmm_dual FSM_STATE_WAIT_REDUCTOR: fsm_state_next = rdct_rdy ? FSM_STATE_STOP : FSM_STATE_WAIT_REDUCTOR; - FSM_STATE_STOP: fsm_state_next = FSM_STATE_IDLE ; + FSM_STATE_STOP: fsm_state_next = FSM_STATE_IDLE ; - default: fsm_state_next = FSM_STATE_IDLE ; + default: fsm_state_next = FSM_STATE_IDLE ; endcase // |