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

===== Commands =====

==== Unlock cartridge (SPI: FE FD FB F5) ====

==== Lock cartridge (SPI: FE FD FB F7) ====

==== 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, 4 bits (D7 46 00 00 00 00 00 00) ====

==== 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.