Example:

(Material [in brackets] is optional.)

lw $t0, -4($s0), at addr 0x4
with PC = 0x4, $s0 = 0x10001000

instruction 8e08fffc

opcode 100011 (lw)
rs 0x16
rt 0x8
imm 0xfffc

PC:
	input 0x8
	output 0x4

Instruction memory:
	input 0x4
	output 8e08fffc

Inputs and output of top-left adder:
	in1 0x4 [current PC]
	in2 4
	out 0x8 [incremented PC]

Inputs and output of top-right adder:
	in1 not used
	in2 not used
	output not used

Control signals:
	RegDst	0
	ALUSrc	1
	MemtoReg 1
	RegWrite 1
	MemRead	1
	MemWrite 0
	Branch 0
	ALUOp 00
		
Inputs and output of register file:
	Read register 1 0x16 [($s0)]
	Read register 2 0x8 [($t0)]
	Write register 0x8 [($t0)]
	Write data whatever is at 0x1000fffc [(-4($s0))]
	Read data 1 0x10001000
	Read data 2 ??

Inputs and output of the main ALU, including the control signals:
	ALU control 0010 (add)
	ALU input 1 0x10001000 [from $s0]
	ALU input 2 0xfffffffc [sign-extended value from "imm" field]
	ALU result 0x10000ffc (-4($s0))]
	Zero not used

Inputs and output of data memory:
	Address 0x1000fffc [(-4($s0))]
	Write data not used
	Write 0
	Read 1
	Read data whatever is at 0x1000fffc

State elements to be changed:
	PC, new value 0x8
	register file, register $t0 to whatever is at 0x1000fffc