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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
`include "core/uarch.sv"
module core_control_select
(
input logic clk,
input insn_decode dec,
input ctrl_cycle cycle,
next_cycle,
input logic mem_ready,
pop_valid,
input reg_num popped,
final_rd,
mul_r_add_lo,
mul_r_add_hi,
output reg_num ra,
rb,
output psr_mode reg_mode
);
reg_num r_shift, last_ra, last_rb;
assign reg_mode = `MODE_SVC; //TODO
always_comb begin
ra = last_ra;
rb = last_rb;
unique case(next_cycle)
ISSUE: begin
ra = dec.data.rn;
rb = dec.snd.r;
end
TRANSFER:
if(cycle != TRANSFER || mem_ready)
// final_rd viene de dec.ldst.rd
rb = pop_valid ? popped : final_rd;
MUL_ACC_LD: begin
ra = mul_r_add_hi;
rb = mul_r_add_lo;
end
endcase
end
always_ff @(posedge clk) begin
last_ra <= ra;
last_rb <= rb;
if(next_cycle == ISSUE)
r_shift <= dec.snd.r_shift;
end
initial begin
last_ra = {$bits(ra){1'b0}};
last_rb = {$bits(rb){1'b0}};
r_shift = {$bits(r_shift){1'b0}};
end
endmodule
|
