summaryrefslogtreecommitdiff
path: root/ctrl_decode.v
blob: ede591f160d15cac32a9e16135690ccf2407febd (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
module ctrl_decode (
	input [32:0] control_signals,

	output [3:0] aluOp,
	output [2:0] aluReg1,
	output [2:0] aluReg2,
	output [1:0] aluOpSource1,		// ALU first operand: 0 = reg, 1 = memory read, 2 = imm8, 3 = PC
	output [1:0] aluOpSource2,		// ALU second operand: 0 = reg, 1 = ~reg, 2 = PC, 3 = ???
	output aluDest,					// 0 = reg, 1 = PC

	output [2:0] regDest,
	output regSetH,
	output regSetL,

	output [2:0] regAddr,
	output memReadB,
	output memReadW,
	output memWriteB,
	output memWriteW,

	output [5:0] setRegCond   // {should set when condition is true, Z doesn't matter, S doesn't matter, Z must be this, S must be this}
);

	assign {
				aluOp,
				aluReg1,
				aluReg2,
				aluOpSource1,
				aluOpSource2,
				aluDest,
				regDest,
				regSetH,
				regSetL,
				regAddr,
				memReadB,
				memReadW,
				memWriteB,
				memWriteW,
				setRegCond
			} = control_signals;
endmodule