diff options
| -rw-r--r-- | src/rtl/montprod.v | 49 |
1 files changed, 16 insertions, 33 deletions
diff --git a/src/rtl/montprod.v b/src/rtl/montprod.v index 8f2d012..f505d0c 100644 --- a/src/rtl/montprod.v +++ b/src/rtl/montprod.v @@ -331,44 +331,19 @@ module montprod( //---------------------------------------------------------------- always @* begin : s_select_write - shr_carry_in_new = 1'b0; - s_mux_new = SMUX_0; - s_mem_we_new = 1'b0; - sa_adder_data_in = 32'h0; - - case (montprod_ctrl_reg) - CTRL_INIT_S: - begin - s_mux_new = SMUX_0; // write 0 - s_mem_we_new = 1'b1; - end - - CTRL_L_CALC_SA: - begin - //s = (s + q*M + b*A) >>> 1;, if(b==1) S+= A. Takes (1..length) cycles. - s_mux_new = SMUX_ADD_SA; - s_mem_we_new = b_reg | q_reg; - end - - CTRL_L_CALC_SDIV2: - begin - //s = (s + q*M + b*A) >>> 1; s>>=1. Takes (1..length) cycles. - s_mux_new = SMUX_SHR; - s_mem_we_new = 1'b1; - end - - default: - begin - end - endcase - - s_mem_new = 32'h0; + sa_adder_data_in = 32'h0; + shr_carry_in_new = 1'b0; add_carry_in_sa_new = 1'b0; add_carry_in_sm_new = 1'b0; + s_mem_new = 32'h0; + s_mem_we_new = 1'b0; case (s_mux_reg) SMUX_0: - s_mem_new = 32'h0; + begin + s_mem_new = 32'h0; + s_mem_we_new = 1'b1; + end SMUX_ADD_SA: begin @@ -384,6 +359,7 @@ module montprod( add_carry_in_sa_new = add_carry_out_sa; add_carry_in_sm_new = add_carry_out_sm; + s_mem_we_new = b_reg | q_reg; end SMUX_SHR: @@ -391,6 +367,7 @@ module montprod( shr_data_in = s_mem_read_data; s_mem_new = shr_data_out; shr_carry_in_new = shr_carry_out; + s_mem_we_new = 1'b1; end default: @@ -483,6 +460,8 @@ module montprod( CTRL_INIT_S: begin + s_mux_new = SMUX_0; + if (word_index_reg == 8'h0) begin loop_ctr_set = 1'b1; @@ -517,6 +496,8 @@ module montprod( CTRL_L_CALC_SA: begin + s_mux_new = SMUX_ADD_SA; + if (word_index_reg == 8'h0) begin reset_word_index_lsw = 1'b1; @@ -534,6 +515,8 @@ module montprod( CTRL_L_CALC_SDIV2: begin + s_mux_new = SMUX_SHR; + if (word_index_reg == length_m1) begin montprod_ctrl_new = CTRL_L_STALLPIPE_D2; |