Example:

(Material [in brackets] is optional.)

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

instruction 8e08fffc

opcode 100011 (lw)
rs 10000
rt 01000
imm 0xfffc (-4)
]

PC:
	input 0x8
	output 0x4

Instruction memory:
	input 0x4
	output 8e08fffc

Inputs and output of top-left adder:
	in1 0x4
	in2 4
	out 0x8 

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 10000 ($s0)
	Read register 2 01000 ($t0)
	Write register 01000 ($t0)
	Write data 0x6 (contents of 0x10000fffc)
	Read data 1 0x10001000
	Read data 2 not used

Inputs and output of the main ALU, including the control signals:
	ALU control 0010 (add)
	ALU input 1 0x10001000 ($s0)
	ALU input 2 0xfffffffc (-4)
	ALU result 0x10001000-4 
                   0x10000ffc (I think)
	Zero not used

Inputs and output of data memory:
	Address 0x10000fffc ($s0-4)
	Write signal 0
	Write data not used
	Read signal 1
	Read data (contents of 0x10000fffc

State elements to be changed:
	PC 0x8
	register file $t0 to contents of 0x10000ffc
	data memory no change