[−][src]Module gba_addresses::sram

Save RAM (SRAM).

This lets you save/restore data for when the GBA is off.

Note that memory in the SRAM region can only be accessed one byte at a time.

  • Attempting to read 16-bit or 32-bit units from SRAM will produce garbage values. Specifically, you get the byte at the target address (as if it was a byte pointer) and then that byte is mirrored to the given width.
  • Attempting to write 16-bit or 32-bit values will write garbage to the target. Specifically, the target has data ROR address*8 written to it (as if it was a byte pointer).

SRAM cannot be accessed via any of the DMA units.

SRAM is mirrored for 32MB starting at the base address. If the cart only has 32kb of SRAM, then that is mirrored across the 64kb span.

  • Size: up to 64kb
  • Wait states: variable (default is 4), but always more than zero.
  • Bus Size: 8-bit
  • Reads: 8

Constants

SRAM_BASE_ADDR

Base Address of SRAM

SRAM_COUNT

There is up to 64kb of memory in SRAM.

SRAM_ENTRY_SIZE

SRAM must be accessed byte by byte.