Rainbow Electronics AT91CAP9S250A User Manual
Page 144
144
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
Figure 21-1. Organization of the External Bus Interface
External Bus Interface
D[15:0]
A[15:2], A[22:18]
PIO
MUX
Logic
User Interface
Chip Select
Assignor
Static
Memory
Controller
Multi-port
DDR/SDRAM
Controller
Bus Matrix
APB
AHB
Address Decoders
A16/BA0
A0/NBS0
A1/NWR2/NBS2
A17/BA1
NCS0
NCS1/BCCS
NRD/CFOE
NCS3/NANDCS
NWR0/NWE/CFWE
NWR1/NBS1/CFIOR
NWR3/NBS3/CFIOW
SDCK
SDCKE/BCCRE
RAS/BCADV
CAS/BCOE
SDWE/BCWE
D[31:16]
A[24:23]
A25/CFRNW
NCS4/CFCS0
NCS5/CFCS1
NCS2
CFCE1
CFCE2
NWAIT
SDA10
NANDOE
NANDWE
NAND Flash
Logic
CompactFlash
Logic
ECC
Controller
Burst
CellularRAM
Controller
ARM926EJS
AHB
AHB
AHB
AHB
SDCKN
SDCS
DQS0
DQS1
BCOWAIT
BCCK
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