diff options
Diffstat (limited to 'src/rtl/sha256_w_mem.v')
| -rw-r--r-- | src/rtl/sha256_w_mem.v | 113 |
1 files changed, 19 insertions, 94 deletions
diff --git a/src/rtl/sha256_w_mem.v b/src/rtl/sha256_w_mem.v index 501cef0..fef1205 100644 --- a/src/rtl/sha256_w_mem.v +++ b/src/rtl/sha256_w_mem.v @@ -51,13 +51,6 @@ module sha256_w_mem( //---------------------------------------------------------------- - // Internal constant and parameter definitions. - //---------------------------------------------------------------- - parameter CTRL_IDLE = 0; - parameter CTRL_UPDATE = 1; - - - //---------------------------------------------------------------- // Registers including update variables and write enable. //---------------------------------------------------------------- reg [31 : 0] w_mem [0 : 15]; @@ -82,12 +75,6 @@ module sha256_w_mem( reg [5 : 0] w_ctr_reg; reg [5 : 0] w_ctr_new; reg w_ctr_we; - reg w_ctr_inc; - reg w_ctr_rst; - - reg [1 : 0] sha256_w_mem_ctrl_reg; - reg [1 : 0] sha256_w_mem_ctrl_new; - reg sha256_w_mem_ctrl_we; //---------------------------------------------------------------- @@ -111,26 +98,14 @@ module sha256_w_mem( //---------------------------------------------------------------- always @ (posedge clk or negedge reset_n) begin : reg_update + integer i; + if (!reset_n) begin - w_mem[00] <= 32'h00000000; - w_mem[01] <= 32'h00000000; - w_mem[02] <= 32'h00000000; - w_mem[03] <= 32'h00000000; - w_mem[04] <= 32'h00000000; - w_mem[05] <= 32'h00000000; - w_mem[06] <= 32'h00000000; - w_mem[07] <= 32'h00000000; - w_mem[08] <= 32'h00000000; - w_mem[09] <= 32'h00000000; - w_mem[10] <= 32'h00000000; - w_mem[11] <= 32'h00000000; - w_mem[12] <= 32'h00000000; - w_mem[13] <= 32'h00000000; - w_mem[14] <= 32'h00000000; - w_mem[15] <= 32'h00000000; - w_ctr_reg <= 6'h00; - sha256_w_mem_ctrl_reg <= CTRL_IDLE; + for (i = 0 ; i < 16 ; i = i + 1) + w_mem[i] <= 32'h0; + + w_ctr_reg <= 6'h0; end else begin @@ -155,14 +130,7 @@ module sha256_w_mem( end if (w_ctr_we) - begin - w_ctr_reg <= w_ctr_new; - end - - if (sha256_w_mem_ctrl_we) - begin - sha256_w_mem_ctrl_reg <= sha256_w_mem_ctrl_new; - end + w_ctr_reg <= w_ctr_new; end end // reg_update @@ -176,13 +144,9 @@ module sha256_w_mem( always @* begin : select_w if (w_ctr_reg < 16) - begin - w_tmp = w_mem[w_ctr_reg[3 : 0]]; - end + w_tmp = w_mem[w_ctr_reg[3 : 0]]; else - begin - w_tmp = w_new; - end + w_tmp = w_new; end // select_w @@ -254,7 +218,8 @@ module sha256_w_mem( w_mem15_new = block[31 : 0]; w_mem_we = 1; end - else if (w_ctr_reg > 15) + + if (next && (w_ctr_reg > 15)) begin w_mem00_new = w_mem[01]; w_mem01_new = w_mem[02]; @@ -284,62 +249,22 @@ module sha256_w_mem( //---------------------------------------------------------------- always @* begin : w_ctr - w_ctr_new = 0; - w_ctr_we = 0; + w_ctr_new = 6'h0; + w_ctr_we = 1'h0; - if (w_ctr_rst) + if (init) begin - w_ctr_new = 6'h00; - w_ctr_we = 1; + w_ctr_new = 6'h0; + w_ctr_we = 1'h1; end - if (w_ctr_inc) + if (next) begin - w_ctr_new = w_ctr_reg + 6'h01; - w_ctr_we = 1; + w_ctr_new = w_ctr_reg + 6'h1; + w_ctr_we = 1'h1; end end // w_ctr - - //---------------------------------------------------------------- - // sha256_w_mem_fsm - // Logic for the w shedule FSM. - //---------------------------------------------------------------- - always @* - begin : sha256_w_mem_fsm - w_ctr_rst = 0; - w_ctr_inc = 0; - - sha256_w_mem_ctrl_new = CTRL_IDLE; - sha256_w_mem_ctrl_we = 0; - - case (sha256_w_mem_ctrl_reg) - CTRL_IDLE: - begin - if (init) - begin - w_ctr_rst = 1; - sha256_w_mem_ctrl_new = CTRL_UPDATE; - sha256_w_mem_ctrl_we = 1; - end - end - - CTRL_UPDATE: - begin - if (next) - begin - w_ctr_inc = 1; - end - - if (w_ctr_reg == 6'h3f) - begin - sha256_w_mem_ctrl_new = CTRL_IDLE; - sha256_w_mem_ctrl_we = 1; - end - end - endcase // case (sha256_ctrl_reg) - end // sha256_ctrl_fsm - endmodule // sha256_w_mem //====================================================================== |