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Board Description
3.14
PIO Usage
Table 3-1. I/O Peripheral Controller A
I/O Line
PA0
PA1
Peripheral A
SPI0_MISO
SPI0_MOSI
Peripheral B
MCDB0
MCCDB
Comments
Function
SPI DataFlash, SPI/MCI SD/MMC/DataFlash Slot
(PA0..PA5)
PA2
SPI0_SPCK
PA3
PA4
PA5
PA6
PA7
PA8
PA9
SPI0_NPCS0
RTS2
CTS2
MCDA0
MCCDA
MCCK
MCDA1
MCDB3
MCDB2
MCDB1
Boot SD Card Slot (DAT0)
Boot SD Card Slot (CMD)
MCI SD/MMC/DataFlash Slot (CLK)
Boot SD Card Slot (DAT1)
1- Boot SD Card Slot (DAT2),
PA10
MCDA2
ETX2
2- ETHERNET DM9161A MII Interface (disconnected
by default, see R120)
1- Boot SD Card Slot (DAT3),
PA11
MCDA3
ETX3
2- ETHERNET DM9161A MII Interface (disconnected
by default, see R119)
PA12
PA13
PA14
PA15
PA16
PA17
PA18
PA19
PA20
PA21
ETX0
ETX1
ERX0
ERX1
ETXEN
ERXDV
ERXER
ETXCK
EMDC
EMDIO
ETHERNET DM9161A RMII Interface (PA12..PA19)
ETHERNET DM9161A MII/RMII Interface (PA20..PA21)
PA22
PA23
PA24
PA25
PA26
PA27
PA28
PA29
PA30
PA31
ADTRG
TWD
TWCK
TCLK0
TIOA0
TIOA1
TIOA2
SCK1
SCK2
SCK0
ETXER
ETX2
ETX3
ERX2
ERX3
ERXCK
ECRS
ECOL
RXD4
TXD4
High-Drive
High-Drive
High-Drive
ETHERNET DM9161A MII Interface
SERIAL EEPROM (SDA), WM8731 audio DAC
SERIAL EEPROM (SCL), WM8731 audio DAC
ETHERNET DM9161A MII Interface (PA25..PA29)
(BP3) User's interface Push Button
(BP4) User's interface Push Button
AT91SAM9G20-EK Evaluation Board User Guide
3-7
6413C–ATARM–18-Feb-09
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