Module gba_addresses::rom

Read Only Memory (ROM).

A GBA's ROM can be up to 32MB.

An interesting detail is that the ROM content is mirrored to three different locations in the address space:

• Wait State 0: 0x0800_0000, this is the "normal" access point.
• Wait State 1: 0x0A00_0000.
• Wait State 2: 0x0C00_0000.

By using the [WAITCNT_ADDR] you can modify the wait states required for each of the three ROM mirrors independently.

• Size: up to 32MB
• Wait states: variable (default is 4), but always more than zero.
• Bus Size: 16-bit
• Reads: 8/16/32

Constants

ROM_WAIT0_BASE_ADDR	ROM base address for wait state 0.
ROM_WAIT1_BASE_ADDR	ROM base address for wait state 1.
ROM_WAIT2_BASE_ADDR	ROM base address for wait state 2.