Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 22

AGB Programming Manual
If the Prefetch Buffer Flag is disabled, the fetch is done from the Game Pak
ROM. There is a wait based on the wait state associated with the fetch
instruction to the Game Pak ROM in respect to the CPU.
WAITCNT [d12 - 11] PHI Terminal Output Control
Controls the output from the PHI terminal. This should always be set to
00(No Output).
WAITCNT [d10 - 08],[d07 - 05],[d04 - 02] Wait State Wait Control
Individual wait cycles for each of the three areas(Wait States 0-2) that
occur in Game Pak ROM can be set. The relation between the wait control
settings and wait cycles is as follows. Use the appropriate settings for the
device you are using.
Wait Control Value
000
001
010
011
100
101
110
111
After executing the System ROM (when the User Program is started) the Wait
Control Value is 000. In the Game Pak Mask ROM used with the actual
manufactured product, the specifications are 1
In this case, set the Wait Control Value to 101.
WAITCNT [d01 - 00] Game Pak RAM Wait Control
Wait cycles for the Game Pak RAM can be set. The relation between the
wait control settings and wait cycles is as follows. Use the appropriate
settings for the device you are using.
©1999 - 2001 Nintendo of America Inc.
st
1 Access
4
3
2
8
4
3
2
8
Wait Control Value
00
01
10
11
Wait Cycles
nd
2
Wait State Wait State
0
2
2
2
2
1
1
1
1
st
Access/3 Wait, 2
Wait Cycles
4
3
2
8
22
AGB Memory
Access
Wait State
1 2
4 8
4 8
4 8
4 8
1 1
1 1
1 1
1 1
nd
Access/1 Wait.
D.C.N. AGB-06-0001-002B4