CLA

111

01:33:10

Much cleaner than my previous attempt.

Based on the following schematics from Wikipedia:

https://commons.m.wikimedia.org/wiki/File:Partial_Full-Adder.svg

https://commons.m.wikimedia.org/wiki/File:4-bit_carry_lookahead_adder.svg

The switches modify the operands

The logic source is the add/subtract instruction, where 0 = add, 1 = subtract. The decimal point on the second operand will light when the instruction is to subtract.

The decimal point on the result represents whether there is a carry.

published 5 months ago

MattFerrie

4 months ago

How do I implement the two's complement of the answer if the subtraction instruction is set and there is a carry?

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