41
1745D–ATARM–04-Nov-05
AT91M55800A
Figure 11-19. 0 Wait States, 16-bit Bus Width, Word Transfer
ADDR
ADDR+1
B
2
B
1
B
4
B
3
B
4
B
3
B
2
B
1
MCK
A1 - A23
NCS
NRD
D0 - D15
Internal Bus
X X B
2
B
1
READ ACCESS
NRD
B
2
B
1
B
4
B
3 D0 - D15
WRITE ACCESS
NWE
B
2
B
1
B
4
B
3 D0 - D15
NLB
NUB
· Standard Protocol
· Early Protocol
· Byte Write/
Byte Select Option