Registers
| Old3DS | Name | Address | Width | Used by |
|---|---|---|---|---|
| Yes | CTRCARD_CNT | 0x10004000 | 4 | |
| Yes | CTRCARD_BLKCNT | 0x10004004 | 4 | |
| Yes | CTRCARD_SECCNT | 0x10004008 | 4 | |
| Yes | CTRCARD_SECSEED | 0x10004010 | 4 | |
| Yes | CTRCARD_CMD | 0x10004020 | 16 | |
| Yes | CTRCARD_FIFO | 0x10004030 | 4 |
CTRCARD_CNT
| Bit | Description |
|---|---|
| 3-0 | ? |
| 4 | CRC status (1=Error, 0=OK)? |
| 15-5 | ? |
| 19-16 | Transfer size (0=0 bytes, 1=4 bytes, 2=0x10 bytes, 0x40, 0x200, 0x400, 0x800, 0x1000, 8=0x4000 bytes) |
| 23-20 | ? |
| 26-24 | Clock delay (0..5) |
| 27 | Data ready (1=Ready, 0=Busy) |
| 28 | Reset (1=High, 0=Low) |
| 29 | Transfer mode (1=Write, 0=Read) |
| 30 | Interrupt enable (1=Enable, 0=Disable) |
| 31 | Start (1=Busy, 0=Idle) |
Remarks
Once reset is set high, it cannot be changed until controller is reset.
CTRCARD_BLKCNT
| Bit | Description |
|---|---|
| 15-0 | Total data blocks to read from FIFO - 1 |
| 31-16 | Total data blocks to write to FIFO - 1 |
CTRCARD_SECCNT
| Bit | Description |
|---|---|
| 2 | Latch key index |
| 9-8 | Key index |
| 15 | Latch seed |
CTRCARD_CMD
Specifies the 16-byte command to send. The command is split into 32-bit words, and stored as least significant word first, with each word itself in big-endian format.