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====== NeoFlash MK6/R6 (NDS) programming ======

===== SPI commands =====

==== Read response (9F FF FF FF) ====

Responds with a dummy byte, then three response bytes.

==== Lock? (FE FD FB F5) ====

==== Unlock? (FE FD FB F7) ====

==== Mode: accelerometer (DS Motion Card) (FE FD FB F8) ====

==== Mode: 4kbit EEPROM (FE FD FB F9) ====

==== Mode: 512kbit EEPROM (FE FD FB FA) ====

==== Mode: 2/4/8mbit FLASH (FE FD FB FB) ====

TODO: Responds with ''20 80 14''?

===== ROM commands =====

==== Set card chip ID? (B9 01 00 00 dd cc bb aa) ====

Set card chip ID to ''aa bb cc dd''.

==== ? (D7 50 ?? 00 00 00 00 00) ====

Part of the TF card initialization process? ''??'' is 00 or 80 - maybe controls TF card reset?

==== TF: Write command byte (D7 57 xx 00 00 00 00 00) ====

==== TF: Read command bits (D7 6x 00 00 00 00 00 00) ====

  * 66: Read 1 bit
  * 67: Read 2 bits
  * 68: Read 3 bits
  * 69: Read 4 bits

==== TF: Read data, 1024 x 4 bits (D7 4E 00 00 00 00 00 00) ====

Returns 1024 bytes; each byte has bits 0-3 set to the 4 bits read.

==== TF: Write data, 4 bits (D7 38 0x 00 00 00 00 00) ====

==== Read halfword (F1 tt aa aa aa aa 00 00) ====

  * tt: target (00 - SRAM, 01 - NOR)

Returns 2 bytes, little endian.

==== Write halfword (F3 0t aa aa aa aa dd dd) ====

  * tt: target (00 - SRAM, 01 - NOR)

''aa'' and ''dd'' are specified in reverse endianness.