| Bits | Description |
|---|---|
| 7 | Reserved |
| 6:2 | Cored ID |
| 1 | Button DRIVE (divmmc) is pressed |
| 0 | Button M1 (multiface) is pressed |
| Bits | Description |
|---|---|
| 7 | Start selected core |
| 6:5 | Reserved, must be 0 |
| 4:0 | Core ID 0-31 (config mode only)* |
* A write of an out of range core id is ignored; this is the preferred way to determine max id