Arithmetic Logic Unit (ALU) is an electronic component that performs arithmetic and bit operations on binary integers.
An ALU component has 3 Buses:
- Operation Integer A
- Operation Integer B
- Operation Result Y
These values are all binary integer signals, and the bus widths of A, B and Y are also the same.
The Opcode is to pass the operand to be executed.
The status of ALU is divided into input and output.
- Input: Status input allows ALU component to receive other information, such as the carry information from the last ALU.
- Output: Output the ALU operation result.
- Carry-out: “carry” of addition, “borrow” of subtraction, and overflow
- Zero: Indicates that all bits of the operation result are logic zero
- Negative: The result of the operation is negative
- Overflow: The result of the operation overflows and exceeds the value range of Y
- Parity: Indicates the parity check result of the output number Y, indicating the parity of the number of logical 1s in Y
The above introduction is refer to https://en.wikipedia.org/wiki/Arithmetic_logic_unit
References
- https://zh.wikipedia.org/wiki/%E7%AE%97%E8%A1%93%E9%82%8F%E8%BC%AF%E5%96%AE%E5%85%83
- https://www.youtube.com/watch?v=1I5ZMmrOfnA