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CARD_SPI_CR (0x040001A0:16)

bit mode name description
15 W Enable Enables the SPI unit (reads as 0?)
14 R/W IRQ Fire an IRQ when transfer is done
13 R/W /Last_Trasmission 0: Last write, 1: Part of a sequence
12..8 W? ? ?
7 R Busy 0: Idle, 1: Transfer in progress
6 R/W Mode 1: Talk to SPI device on DS Card
5..2 R - 000
1..0 R/W SPI frequency 0: 4.19MHz, 1: 2.10MHz, 2: 1.05MHz, 3: 524kHz

By comparison with the ARM7, some of the writable bits may select bus speed or 8/16 bit mode. Fixme: test this (write-and-stick bits = 00ffe043).

CARD_SPI_DATA (0x040001A2:16)

bit mode name description
15..8 W? ? ?
7..0 R/W SPI data *

A read returns the last value transferred in, while a write starts a transfer cycle.

For more information, see the SPI page for more information on SPI bus transfers, and Chips for information on some of the save memories used on DS cards.

CARD_CR2 (0x040001A4:32)

bit name description
31 R/W enable/start
30 R/W is command is this a send command or a read?
29 R/W reset controls the status of the reset line?
28 R/W ? set after setting the encrypt registers
27 R/W ?
26..24 R/W datablock count used for reading multiple of 512 bytes. 7=invalid
23 R data ready err, in one place it reads from one reg, and in the other, another
22 R/W ?
21..16 R/W length of some sort
15 W ? set after setting encrypt registers, elsewhere
14 R/W encrypt 1=encrypt this command, 0=nah, send it plaintext
13 R/W ? only used on the binary transfers (10,20,A0,40,60)
12..0 R/W Data transfer size (does not count size of command itself)

ff7f7fff

Write-onlys (0x040001B0..1BB)

Write-only These are encrypt registers, they control the internal encryptor/decryptor, versus the 3C command which tells the card to set its encryptor/decryptor.

   * 0x040001B0:32 = CARD_1B0 (32 bits)
   * 0x040001B4:32 = CARD_1B4 (7 bits)
   * 0x040001B8:16 = CARD_1B8 (32 bits)
   * 0x040001BA:16 = CARD_1BA (7 bits) 

Command registers

   * 0x040001A8:8
   * 0x040001A9:8
   * 0x040001AA:8
   * 0x040001AB:8
   * 0x040001AC:8
   * 0x040001AD:8
   * 0x040001AE:8
   * 0x040001AF:8 

Both sets of write-only registers read as 00's.

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