ALU with write back

CEDAR Logic Circuit,

There is one major change for this lab. You no longer need an output LED Display. The outputs will be stored back into A. This creates a timing issue that you will need to handle. A WB (write back) register is suggested. Have your clock be a single pulse generator that you control so you can see what occurs at each step.

The Opcode for the 8 required are as follows


ADDA 0x03 A + operand

SUBA 0x05 A – operand

ANDA 0x02 A AND operand

ORA 0x06 A OR operand

EORA 0x07 A XOR operand

LDAA (immediate) 0x0A load A with #

LDAA (direct) 0x0E load A with memory

STAA 0x0D store A to memory

The full adder should have the following inputs and outputs.


Opcode - Attach to a 4-bit hex keypad

Operand - Attach to a 4-bit hex keypad

When testing this you will want to have a 4 bit hex keypad for the opcode and one for the operand. However, when you submit, I do not need or want the keypads, so get rid of them prior to submission.


S0-S3 - NONE

C3 - Attach to LED

Skills: Electronics, Telecommunications Engineering

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