ICache: Change cache_data to block RAM (yay!).
[firearm.git] / Fetch.v
... / ...
CommitLineData
1module Fetch(
2 input clk,
3 input Nrst,
4
5 output wire [31:0] ic__rd_addr_0a,
6 output wire ic__rd_req_0a,
7 input ic__rd_wait_0a,
8 input [31:0] ic__rd_data_1a,
9
10 input stall_0a,
11 input jmp_0a,
12 input [31:0] jmppc_0a,
13 output reg bubble_1a = 1,
14 output reg [31:0] insn_1a = 0,
15 output reg [31:0] pc_1a = 32'hFFFFFFFC);
16
17 reg qjmp = 0; /* A jump has been queued up while we were waiting. */
18 reg [31:0] qjmppc;
19 always @(posedge clk or negedge Nrst)
20 if (!Nrst)
21 qjmp <= 0;
22 else if ((ic__rd_wait_0a || stall_0a) && jmp_0a)
23 {qjmp,qjmppc} <= {jmp_0a, jmppc_0a};
24 else if (!ic__rd_wait_0a && !stall_0a && qjmp) /* It has already been intoed. */
25 {qjmp,qjmppc} <= {1'b0, 32'hxxxxxxxx};
26
27 reg [31:0] reqpc_0a;
28
29 /* Output latch logic */
30 reg [31:0] insn_2a;
31 reg stall_1a;
32 always @(posedge clk or negedge Nrst)
33 if (!Nrst) begin
34 insn_2a <= 32'h00000000;
35 stall_1a <= 0;
36 end else begin
37 insn_2a <= insn_1a;
38 stall_1a <= stall_0a;
39 end
40
41 always @(*)
42 if (stall_1a)
43 insn_1a = insn_2a;
44 else
45 insn_1a = ic__rd_data_1a;
46
47 assign ic__rd_addr_0a = reqpc_0a;
48 assign ic__rd_req_0a = 1;
49
50 always @(posedge clk or negedge Nrst)
51 if (!Nrst) begin
52 bubble_1a <= 1;
53 pc_1a <= 32'h00000000;
54 end else if (!stall_0a) begin
55 bubble_1a <= (jmp_0a || qjmp || ic__rd_wait_0a);
56 pc_1a <= reqpc_0a;
57 end
58
59 always @(posedge clk or negedge Nrst)
60 if (!Nrst)
61 reqpc_0a <= 0;
62 else if (!stall_0a && !ic__rd_wait_0a) begin
63 if (qjmp)
64 reqpc_0a <= qjmppc;
65 else if (jmp_0a)
66 reqpc_0a <= jmppc_0a;
67 else
68 reqpc_0a <= reqpc_0a + 4;
69 end
70endmodule
This page took 0.015012 seconds and 4 git commands to generate.