diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/rtl/montprod.v | 73 |
1 files changed, 41 insertions, 32 deletions
diff --git a/src/rtl/montprod.v b/src/rtl/montprod.v index 85eea11..2c27941 100644 --- a/src/rtl/montprod.v +++ b/src/rtl/montprod.v @@ -111,7 +111,7 @@ module montprod( reg s_mem_we_reg; reg s_mem_we_new; reg [07 : 0] s_mem_addr; - reg [07 : 0] s_mem_wr_addr; + reg [07 : 0] s_mem_wr_addr_reg; wire [31 : 0] s_mem_read_data; reg q; //q = (s - b * A) & 1 @@ -119,9 +119,9 @@ module montprod( reg b; //b: bit of B reg b_reg; - reg [12 : 0] loop_counter; + reg [12 : 0] loop_counter_reg; reg [12 : 0] loop_counter_new; - reg [12 : 0] loop_counter_dec; + reg loop_counter_we; reg [07 : 0] B_word_index; //loop counter as a word index reg [04 : 0] B_bit_index; //loop counter as a bit index @@ -179,7 +179,7 @@ module montprod( .read_addr(s_mem_addr), .read_data(s_mem_read_data), .wr(s_mem_we_reg), - .write_addr(s_mem_wr_addr), + .write_addr(s_mem_wr_addr_reg), .write_data(s_mem_new) ); @@ -220,7 +220,7 @@ module montprod( if (!reset_n) begin ready_reg <= 1'b0; - loop_counter <= 13'h0; + loop_counter_reg <= 13'h0; word_index <= 8'h0; word_index_prev <= 8'h0; add_carry_in_sa <= 1'b0; @@ -231,28 +231,18 @@ module montprod( q_reg <= 1'b0; s_mux_reg <= SMUX_0; s_mem_we_reg <= 1'b0; - s_mem_wr_addr <= 8'h0; + s_mem_wr_addr_reg <= 8'h0; B_bit_index_reg <= 5'h0; end else begin - if (ready_we) - ready_reg <= ready_new; - - if (montprod_ctrl_we) - begin - montprod_ctrl_reg <= montprod_ctrl_new; - end - - s_mem_wr_addr <= s_mem_addr; + s_mem_wr_addr_reg <= s_mem_addr; + s_mem_we_reg <= s_mem_we_new; - s_mem_we_reg <= s_mem_we_new; - - word_index <= word_index_new; + word_index <= word_index_new; word_index_prev <= word_index; - loop_counter <= loop_counter_new; - shr_carry_in <= shr_carry_new; + shr_carry_in <= shr_carry_new; add_carry_in_sa <= add_carry_new_sa; add_carry_in_sm <= add_carry_new_sm; @@ -261,7 +251,18 @@ module montprod( b_reg <= b; s_mux_reg <= s_mux_new; - end + + if (ready_we) + ready_reg <= ready_new; + + if (montprod_ctrl_we) + begin + montprod_ctrl_reg <= montprod_ctrl_new; + end + + if (loop_counter_we) + loop_counter_reg <= loop_counter_new; + end end // reg_update @@ -315,27 +316,35 @@ module montprod( always @* begin : loop_counter_logic - loop_counter_new = loop_counter; + loop_counter_new = 13'h000; + loop_counter_we = 1'b0; + length_m1 = length - 1'b1; - loop_counter_dec = loop_counter - 1'b1; - B_word_index = loop_counter[12:5]; + B_word_index = loop_counter_reg[12:5]; B_bit_index = B_bit_index_reg; case (montprod_ctrl_reg) CTRL_LOOP_INIT: - loop_counter_new = {length, 5'b00000} - 1'b1; + begin + loop_counter_new = {length, 5'b00000} - 1'b1; + loop_counter_we = 1'b1; + end CTRL_LOOP_ITER: begin - B_word_index = loop_counter[12:5]; - B_bit_index = 5'h1f - loop_counter[4:0]; + B_word_index = loop_counter_reg[12:5]; + B_bit_index = 5'h1f - loop_counter_reg[4:0]; end CTRL_L_STALLPIPE_D2: - loop_counter_new = loop_counter_dec; + begin + loop_counter_new = loop_counter_reg - 1'b1; + loop_counter_we = 1'b1; + end default: - loop_counter_new = loop_counter; + begin + end endcase end @@ -366,11 +375,10 @@ module montprod( endcase - - result_addr_reg = word_index_prev; result_data_reg = s_mem_read_data; + case (montprod_ctrl_reg) CTRL_EMIT_S: tmp_result_we = 1'b1; @@ -565,7 +573,8 @@ module montprod( montprod_ctrl_new = CTRL_LOOP_ITER; //loop montprod_ctrl_we = 1'b1; reset_word_index_LSW = 1'b1; - if (loop_counter == 0) + + if (loop_counter_reg == 0) begin montprod_ctrl_new = CTRL_L_STALLPIPE_ES; montprod_ctrl_we = 1'b1; |