Manual

145
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
21.2 I/O Lines Description
Table 21-1. EBI I/O Lines Description
Name Function Type Active Level
EBI
D0 - D31 Data Bus I/O
A0 - A25 Address Bus Output
NWAIT External Wait Signal Input Low
SMC
NCS0 - NCS5 Chip Select Lines Output Low
NWR0 - NWR3 Write Signals Output Low
NRD Read Signal Output Low
NWE Write Enable Output Low
NBS0 - NBS3 Byte Mask Signals Output Low
EBI for CompactFlash Support
CFCE1 - CFCE2 CompactFlash Chip Enable Output Low
CFOE CompactFlash Output Enable Output Low
CFWE CompactFlash Write Enable Output Low
CFIOR CompactFlash I/O Read Signal Output Low
CFIOW CompactFlash I/O Write Signal Output Low
CFRNW CompactFlash Read Not Write Signal Output
CFCS0 - CFCS1 CompactFlash Chip Select Lines Output Low
EBI for NAND Flash Support
NANDCS NAND Flash Chip Select Line Output Low
NANDOE NAND Flash Output Enable Output Low
NANDWE NAND Flash Write Enable Output Low
DDR/SDRAM Controller
SDCK DDR/SDRAM Clock Output
SDCKN DDR Inverted Clock Output
DQS0 DDR Data Qualifier Strobe 0 I/O
DQS1 DDR Data Qualifier Strobe 1 I/O
SDCKE DDR/SDRAM Clock Enable Output High
SDCS DDR/SDRAM Chip Select Line Output Low
BA0 - BA1 DDR/SDRAM Bank Select Output
SDWE DDR/SDRAM Write Enable Output Low
RAS - CAS DDR/SDRAM Row and Column Signal Output Low
NBS0 - NBS3 DDR/SDRAM Byte Mask Signals Output Low
SDA10 DDR/SDRAM Address 10 Line Output
Burst CellularRAM Controller