ICache, Fetch: Re-pipe things such that the icache now has a one-cycle latency. ...

[firearm.git] / Fetch.v

diff --git a/Fetch.v b/Fetch.v
index 4dbe365613b73f7588ef1ac79f1f34aca0eba83e..fc4d899baae1d9baae0606503d71d5aaffed425f 100644 (file)
--- a/Fetch.v
+++ b/Fetch.v
@@ -5,7 +5,7 @@ module Fetch(
        output wire [31:0] ic__rd_addr_0a,
        output wire        ic__rd_req_0a,
        input              ic__rd_wait_0a,
        output wire [31:0] ic__rd_addr_0a,
        output wire        ic__rd_req_0a,
        input              ic__rd_wait_0a,

-       input       [31:0] ic__rd_data_0a,
+       input       [31:0] ic__rd_data_1a,

        
        input              stall_0a,
        input              jmp_0a,
        
        input              stall_0a,
        input              jmp_0a,


@@ -27,16 +27,33 @@ module Fetch(
        reg [31:0] reqpc_0a;
        
        /* Output latch logic */
        reg [31:0] reqpc_0a;
        
        /* Output latch logic */

+       reg [31:0] insn_2a;
+       reg stall_1a;
+       always @(posedge clk or negedge Nrst)
+               if (!Nrst) begin
+                       insn_2a <= 32'h00000000;
+                       stall_1a <= 0;
+               end else begin
+                       insn_2a <= insn_1a;
+                       stall_1a <= stall_0a;
+               end
+       
+       always @(*)
+               if (stall_1a)
+                       insn_1a = insn_2a;
+               else
+                       insn_1a = ic__rd_data_1a;
+       

        assign ic__rd_addr_0a = reqpc_0a;
        assign ic__rd_req_0a = 1;
        assign ic__rd_addr_0a = reqpc_0a;
        assign ic__rd_req_0a = 1;

+       
+       

        always @(posedge clk or negedge Nrst)
                if (!Nrst) begin
                        bubble_1a <= 1;
        always @(posedge clk or negedge Nrst)
                if (!Nrst) begin
                        bubble_1a <= 1;

-                       insn_1a <= 32'h00000000;

                        pc_1a <= 32'h00000000;
                end else if (!stall_0a) begin
                        bubble_1a <= (jmp_0a || qjmp || ic__rd_wait_0a);
                        pc_1a <= 32'h00000000;
                end else if (!stall_0a) begin
                        bubble_1a <= (jmp_0a || qjmp || ic__rd_wait_0a);

-                       insn_1a <= ic__rd_data_0a;

                        pc_1a <= reqpc_0a;
                end
        
                        pc_1a <= reqpc_0a;
                end