diff options
| -rw-r--r-- | src/rtl/montprod.v | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/src/rtl/montprod.v b/src/rtl/montprod.v index cd7d5a9..4f4a9aa 100644 --- a/src/rtl/montprod.v +++ b/src/rtl/montprod.v @@ -142,9 +142,9 @@ module montprod( reg shr_carry_in_reg; reg shr_carry_in_new; - reg first_iteration_reg; - reg first_iteration_new; - reg first_iteration_we; + reg first_iteration_reg; + reg first_iteration_new; + reg first_iteration_we; //---------------------------------------------------------------- @@ -160,10 +160,11 @@ module montprod( wire shr_carry_out; wire [31 : 0] shr_data_out; - reg reset_word_index_lsw; - reg reset_word_index_msw; + reg reset_word_index_lsw; + reg reset_word_index_msw; - reg [31 : 0] sa_adder_data_in; + reg [31 : 0] sa_adder_data_in; + reg [31 : 0] muxed_s_mem_read_data; @@ -195,7 +196,7 @@ module montprod( adder32 s_adder_sm( - .a(s_mem_read_data), + .a(muxed_s_mem_read_data), .b(opm_data), .carry_in(add_carry_in_sm_reg), .sum(add_result_sm), @@ -339,9 +340,10 @@ module montprod( //---------------------------------------------------------------- always @* begin : s_select_write - shr_carry_in_new = 1'b0; - s_mem_we_new = 1'b0; - sa_adder_data_in = 32'h0; + shr_carry_in_new = 1'b0; + muxed_s_mem_read_data = 32'h0; + s_mem_we_new = 1'b0; + sa_adder_data_in = 32'h0; case (montprod_ctrl_reg) CTRL_INIT_S: @@ -376,10 +378,17 @@ module montprod( SMUX_ADD_SA: begin + if (first_iteration_reg) + muxed_s_mem_read_data = 32'h0; + else + muxed_s_mem_read_data = s_mem_read_data; + + if (q_reg) sa_adder_data_in = add_result_sm; else - sa_adder_data_in = s_mem_read_data; + sa_adder_data_in = muxed_s_mem_read_data; + if (b_reg) s_mem_new = add_result_sa; @@ -475,8 +484,8 @@ module montprod( ready_new = 1'b0; ready_we = 1'b1; reset_word_index_lsw = 1'b1; - first_iteration_new = 1'b1; - first_iteration_we = 1'b1; +// first_iteration_new = 1'b1; +// first_iteration_we = 1'b1; montprod_ctrl_new = CTRL_INIT_S; montprod_ctrl_we = 1'b1; end @@ -532,8 +541,8 @@ module montprod( CTRL_L_STALLPIPE_SA: begin - first_iteration_new = 1'b0; - first_iteration_we = 1'b1; +// first_iteration_new = 1'b0; +// first_iteration_we = 1'b1; montprod_ctrl_new = CTRL_L_CALC_SDIV2; montprod_ctrl_we = 1'b1; reset_word_index_msw = 1'b1; |