|
|
|
Last change: 15/02/2002
1) Introduction
The successor of the GameBoy has a dot screen of 240x160 pixels, being able to show 16 bits coded colored pictures (a set of 32768 colors).
The GameBoy Advance run with a 32 bits ARM7TDMI 16,78 Mhz processor (Risc architecture) This processor allow the use of two kind of instruction: a 32 bits instructions in the ARM mode, and a 16 bits instructions in the THUMB mode. and is also combinated with a graphic processor witch execute the biggest part of 2d operation. The GameBoy Advance contain a second processor (Z80) that maintain the downward compatibility with the old Gameboy / GameBoy Color.
The GBA use severale memories: 96Ko of video ram (adressable etheir in 16 or 32 bits), 1Ko of ram palette (16/32 bits), 1Ko for the sprite properties (16/32 bits), 32ko of 'fast' ram (8/16/32 bits) and 256 ko of external 'slow' ram (8/16/32 bits).
There's a stereo sound generated on 6 channel. The first four channel are the same of the GameBoy, and the two others allow to play a continuous stream of data (like the *.WAV wave file).
Finally we have a directional trigger and 6 buttons (Start, Select, A, B, left and right trigger) and a plug for communication cable.
2) Memory Map of the GBA
|
Adresse
|
Description
|
Size
|
Bus
|
| 0x0E00FFFF
0x0E000000 |
RAM
of the Game Cartridge (Game Pak RAM) |
64
Ko Max
|
8
|
| 0x0DFFFFFF
0x0C000000 |
Mirror
of the Cartridge ROM (Game ROM Mirror) |
8
Mo (32 MB)
|
8/16/32
|
| 0x0BFFFFFF
0x0A000000 |
Mirror
of the Cartridge ROM (Game ROM Mirror) |
8
Mo (32 MB)
|
8/16/32
|
| 0x09FFFFFF
0x08000000 |
Cartridge
ROM (Game ROM) |
8
Mo (32 MB)
|
8/16/32
|
| 0x070003FF
0x07000000 |
Sprites
RAM (OAM) |
1
Ko
|
16/32
|
| 0x06017FFF
0x06000000 |
Video
RAM (0x6010000 = Start location of sprite) |
96
Ko
|
16/32
|
| 0x050003FF 0x05000200 0x05000000 |
} RAM
Palette Sprites } RAM Palette Background |
1
Ko
|
16/32
|
|
0x04000000 |
I/O registers |
-
|
8/16/32
|
| 0x03007FFF
0x03000000 |
Processor
Internal RAM (Work RAM) |
32
Ko
|
8/16/32
|
| 0x0203FFFF
0x02000000 |
Processor
External RAM (External RAM) |
256
Ko
|
8/16/32
|
| 0x00003FFF
0x00000000 |
System ROM (bios) |
16
Ko
|
8/16/32
|