diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/montprod.v | 76 |
1 files changed, 41 insertions, 35 deletions
diff --git a/src/rtl/montprod.v b/src/rtl/montprod.v index 7102e6e..927356f 100644 --- a/src/rtl/montprod.v +++ b/src/rtl/montprod.v @@ -121,6 +121,8 @@ module montprod( reg [12 : 0] loop_counter_reg; reg [12 : 0] loop_counter_new; reg loop_counter_we; + reg loop_counter_set; + reg loop_counter_dec; reg [07 : 0] B_word_index; //loop counter as a word index reg [04 : 0] B_bit_index; //loop counter as a bit index @@ -155,6 +157,8 @@ module montprod( wire shr_carry_out; wire [31 : 0] shr_adiv2; + reg in_iter; + //---------------------------------------------------------------- // Concurrent connectivity for ports etc. @@ -310,43 +314,39 @@ module montprod( //---------------------------------------------------------------- - // loop_counter_logic - // Logic for the loop counter and setting related B indices. + // Process for iterating the loop counter and setting related B indexes //---------------------------------------------------------------- always @* - begin : loop_counter_logic - - loop_counter_new = 13'h000; - loop_counter_we = 1'b0; + begin : loop_counter_process + loop_counter_new = loop_counter_reg; + loop_counter_we = 1'b0; + length_m1 = length - 1'b1; + B_bit_index = B_bit_index_reg; - length_m1 = length - 1'b1; - B_word_index = loop_counter_reg[12:5]; - B_bit_index = B_bit_index_reg; - - case (montprod_ctrl_reg) - CTRL_LOOP_INIT: - begin - loop_counter_new = {length, 5'b00000} - 1'b1; - loop_counter_we = 1'b1; - end + if (loop_counter_set) + begin + loop_counter_new = {length, 5'b00000} - 1'b1; + loop_counter_we = 1'b1; + end - CTRL_LOOP_ITER: - begin - B_word_index = loop_counter_reg[12:5]; - B_bit_index = 5'h1f - loop_counter_reg[4:0]; - end + case (montprod_ctrl_reg) + CTRL_LOOP_ITER: + begin + B_word_index = loop_counter_reg[12:5]; + B_bit_index = 5'h1f - loop_counter_reg[4:0]; + end - CTRL_L_STALLPIPE_D2: - begin - loop_counter_new = loop_counter_reg - 1'b1; - loop_counter_we = 1'b1; - end + CTRL_L_STALLPIPE_D2: + begin + loop_counter_new = loop_counter_reg - 1'b1; + loop_counter_we = 1'b1; + end - default: - begin - end - endcase - end + default: + begin + end + endcase + end //---------------------------------------------------------------- @@ -472,6 +472,10 @@ module montprod( montprod_ctrl_new = CTRL_IDLE; montprod_ctrl_we = 1'b0; + loop_counter_set = 1'b0; + loop_counter_dec = 1'b0; + in_iter = 1'b0; + reset_word_index_LSW = 1'b0; reset_word_index_MSW = 1'b0; @@ -497,14 +501,14 @@ module montprod( begin if (word_index_reg == 8'h0) begin - montprod_ctrl_new = CTRL_LOOP_INIT; - montprod_ctrl_we = 1'b1; + montprod_ctrl_new = CTRL_LOOP_INIT; + montprod_ctrl_we = 1'b1; end end - CTRL_LOOP_INIT: begin + loop_counter_set = 1'b1; montprod_ctrl_new = CTRL_LOOP_ITER; montprod_ctrl_we = 1'b1; end @@ -513,6 +517,7 @@ module montprod( // Also abort loop if done. CTRL_LOOP_ITER: begin + in_iter = 1'b1; reset_word_index_LSW = 1'b1; montprod_ctrl_new = CTRL_LOOP_BQ; montprod_ctrl_we = 1'b1; @@ -570,7 +575,8 @@ module montprod( CTRL_L_STALLPIPE_D2: begin - montprod_ctrl_new = CTRL_LOOP_ITER; //loop + loop_counter_dec = 1'b1; + montprod_ctrl_new = CTRL_LOOP_ITER; montprod_ctrl_we = 1'b1; reset_word_index_LSW = 1'b1; |