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A notched rectangle, indented at the top centre.
Also known as: Arithmetic unit, Notched rectangle, Datapath ALU block, Arithmetic logic unit block
The ALU's symbol is a rectangle with a V-shaped notch cut into its top edge, and that notch is a deliberate identifier — no other block in a datapath diagram has it. The notch is where the carry-in conventionally enters.
Denotes an arithmetic logic unit: the block performing arithmetic and logical operations on two operands under a function-select input.
Contexts: Electrical equipment
Is drawn with a V-shaped notch in its upper edge, which distinguishes it at a glance from every other rectangular block in a datapath.
Contexts: Electrical equipment
Produces status flags alongside its result — carry, zero, overflow, negative — which are what conditional branches test.
Contexts: Electrical equipment
A broad rectangle with a V-shaped notch cut into the middle of its upper edge, two operand inputs above and one result output below.