Anti-brick Register
From SpecNext official Wiki
| Number | $10 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Used within the Anti-brick system. |
Read bit mapped:
| Bit | Effect |
|---|---|
| 7-2 | Reserved |
| 1 | Button DRIVE (DivMMC) is pressed |
| 0 | Button M1 (Multiface) is pressed |
Write bit mapped:
| Bit | Effect |
|---|---|
| 7 | Start selected core (reboot FPGA) |
| 6-5 | Reserved, must be 0 |
| 4-0 | Core ID 0-31 (default is 2) (only in config mode) |
Note that in normal running pressing the DivMMC or Multiface button creates an NMI which halts any running program, and the reflashable core must be loaded before any user code is run. This means that unless you are rewriting the entire firmware from scratch this register is probably not useful.