MicroBlaze uses two instruction formats: Type A and Type B.
Type A
Type A is used for register-register instructions. It contains the opcode, one destination and two source registers.
| Opcode | Destination Reg | Source Reg A | Source Reg B | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 6 | 11 | 16 | 21 | 31 | ||||||||||||||||||||||||||
Type B
Type B is used for register-immediate instructions. It contains the opcode, one destination and one source registers, and a source 16-bit immediate value.
| Opcode | Destination Reg | Source Reg A | Immediate Value | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 6 | 11 | 16 | 31 | |||||||||||||||||||||||||||