notes:flashcart:scgba
Table of Contents
SuperCard (GBA) programming
All models
SC_MODE (0x9FFFFFE)
To unlock this register, one must write 0xA55A to it first.
15 bit 0 ---- ---- ---- ---- ???? ???? ???? ?wsm ||| ||+- Memory mapped: 0 = internal flash, 1 = PSRAM |+-- CF/SD card interface mapped: 0 = No, 1 = Yes +--- PSRAM write enabled: 0 = no, 1 = yes SRAM bank: 0 = first 64 KiB, 1 = second 64 KiB
CompactFlash models
For CompactFlash card access, the SuperCard CF mimics the GBA Movie Player interface.
SD models
SCSD_DATA_WR (0x900000x)
SD card 4-bit data bus writes.
15 bit 0 ---- ---- ---- ---- oooo .... .... .... |||| ++++---------------- Written value.
SCSD_DATA_RD (0x910000x)
SD card 4-bit data bus reads.
TODO: Most likely operates as a 16-bit shift register. This means that, to read sixteen bits in order, the address must be accessed four times.
15 bit 0 ---- ---- ---- ---- oooo .... .... .... |||| ++++---------------- Written value.
SCSD_CMD (0x9800000)
SD card 1-bit command bus.
15 bit 0 ---- ---- ---- ---- .... ..?? o... ...i || | | || | +- Input (from card) || | || +--------- Output (to card) || ++----------- Related to card insertion?
SuperCard Lite
SCLT_ENABLE (0x9440000)
See also
notes/flashcart/scgba.txt · Last modified: by asie