blob: 238da8868e72bae73f59ad854bef247563eb7e0b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
`include "core/uarch.sv"
module core_porch
(
input logic clk,
rst_n,
flush,
stall,
input psr_flags flags,
input word fetch_insn,
input ptr fetch_insn_pc,
fetch_head,
input insn_decode fetch_dec,
output word insn,
output ptr insn_pc,
output insn_decode dec
);
logic execute, conditional, undefined;
insn_decode hold_dec;
always_comb begin
dec = hold_dec;
dec.ctrl.execute = !flush && dec.ctrl.execute && execute;
dec.ctrl.undefined = !flush && (dec.ctrl.undefined || undefined);
dec.ctrl.conditional = !flush && (dec.ctrl.conditional || conditional);
end
core_porch_conds conds
(
.*
);
always_ff @(posedge clk or negedge rst_n)
if(!rst_n) begin
insn <= `NOP;
insn_pc <= 0;
hold_dec <= {$bits(hold_dec){1'b0}};
end else if(flush || !stall) begin
insn <= flush ? `NOP : fetch_insn;
insn_pc <= flush ? fetch_head : fetch_insn_pc;
hold_dec <= fetch_dec;
end
endmodule
|
