Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
10
External Memory Bus
D0–D15 Data Bus I/O Pulled-up input at reset
A0–A23 Address Bus Output 0 at reset
Static Memory Controller - SMC
NCS0–NCS7 Chip Select Lines Output Low
NWR0–NWR1 Write Signal Output Low
NRD Read Signal Output Low
NWE Write Enable Output Low
NBS0–NBS1 Byte Mask Signal Output Low
NWAIT External Wait Signal Input Low
NAND Flash Controller - NFC
NANDOE NAND Flash Output Enable Output Low
NANDWE NAND Flash Write Enable Output Low
NANDRDY NAND Ready Input
NANDCLE
NAND Flash Command Line
Enable
Output Low
NANDALE NAND Flash Address Line Enable Output Low
SDRAM Controller - SDRAMC
SDCK SDRAM Clock Output Tied low after reset
SDCKE SDRAM Clock Enable Output High
SDCS SDRAM Controller Chip Select Line Output Low
BA[1:0] Bank Select Output
SDWE SDRAM Write Enable Output Low
RAS - CAS Row and Column Signal Output Low
NBS[1:0] Byte Mask Signals Output Low
SDA10 SDRAM Address 10 Line Output
High Speed Multimedia Card Interface - HSMCI
MCCK Multimedia Card Clock I/O
MCCDA Multimedia Card Slot A Command I/O
MCDA0–MCDA7 Multimedia Card Slot A Data I/O
MCCDB Multimedia Card Slot B Command I/O
MCDB0–MCDB3 Multimedia Card Slot A Data I/O
Universal Synchronous Asynchronous Receiver Transmitter - USARTx
SCKx USARTx Serial Clock I/O
TXDx USARTx Transmit Data I/O
RXDx USARTx Receive Data Input
RTSx USARTx Request To Send Output
CTSx USARTx Clear To Send Input
Table 3-1. Signal Description List (Continued)
Signal Name Function Type
Active
Level
Voltage
Reference Comments