685 Michaels Tiny Tapeout ALU
685 : Michaels Tiny Tapeout ALU
- Author: Michael McCulloch
- Description: Should work as a 2 6 bit input ALU, which then can choose from the RISCV ALU opcodes to select the operation which will be outputed in 8bit
- GitHub repository
- Clock: 0 Hz
How it works
In short the first 6 bits of the bidirection IO is A, then bits 7 and 7 of the bidirectional and bits 0 to 3 of the single way input are B and the last 4 bits are the ALU opcode (based on RISCV) Values get outputted in 8bit from the single way output bus
How to test
Setting the inputs and testing the outputs for certain opcodes
External hardware
None at the moment... Could attach LEDs for testing
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | Bit 2 of ALU Input B | Bit 0 of ALU Output | Bit 0 of ALU Input A |
| 1 | Bit 3 of ALU Input B | Bit 1 of ALU Output | Bit 1 of ALU Input A |
| 2 | Bit 4 of ALU Input B | Bit 2 of ALU Output | Bit 2 of ALU Input A |
| 3 | Bit 5 of ALU Input B | Bit 3 of ALU Output | Bit 3 of ALU Input A |
| 4 | Bit 0 of ALU OpCode | Bit 4 of ALU Output | Bit 4 of ALU Input A |
| 5 | Bit 1 of ALU Opcode | Bit 5 of ALU Output | Bit 5 of ALU Input A |
| 6 | Bit 2 of ALU OpCode | Bit 6 of ALU Output | Bit 0 of ALU Input B |
| 7 | Bit 3 of ALU OpCode | Bit 7 of ALU Output | Bit 1 of ALU Input B |