Filter
Top Products
VIPER Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue E 22
PXA255 GPIO pin assignments
The following table summarizes the use of the 85 PXA255 GPIO pins, their direction,
alternate function and active level.
For embedded Linux the GPIO pins are setup by Redboot. Under VxWorks and
Windows CE, they are setup by the OS and not by the bootloader.
Key:
AF Alternate function.
Dir Pin direction.
Active Function active level or edge.
Sleep Pin state during sleep mode (all Hi-Z states are to ‘1’ during sleep).
GPIO
No
AF
Signal name Dir Active Sleep Function See section…
0 0 ETHER_INT Input Input Ethernet Interrupt
1 0 PC/104_IRQ Input See
page
285H30
Input CPLD Interrupt
2 0 USB_IRQ Input Input USB Interrupt
3 0 UART_INT1 Input Input COM 5 Interrupt
4 0 UART_INT2 Input Input COM 4 Interrupt
47HInterrupt assignments
(page
284H30)
5 0
Reserved
Input NA Input
Reserved
286HReserved – LK2 (page 287H98)
6 0 PSU_DATA Output NA 0 Microprocessor Core
Voltage DAC Data
288HProcessor power
management
(page 289H81)
7 0
USER_CONFIG1
Input NA Input User Config 1, Jumper
LK3
290HUser configurable jumper
1 – LK3
(page 291H98)
8 0 CF_RDY Input NA Input CompactFLASH
Ready/nBusy
48HInterrupt assignments,
(page
292H30 and
293HCompactFLASH
page
294H28)
9 0 BLKEN Output High 0 LCD Backlight Enable 295HLCD backlight enable
(page
296H37)
10 0 LCDEN Output High 0 LCD Logic Supply
Enable
297HLCD logic supply enable
(page
298H37)
11 0 PSU_CLK Output 0 Microprocessor Core
Voltage DAC Clock
299HProcessor power
management
(page 300H81)
12 0 SHDN Output High 1 COM 1, 2, 3 & 4 UART
Shutdown
301HUART power management
(page 302H83)
13 0 USB_WAKEUP Output High 0 Wake Up USB Host
from suspend
303HUSB power management
(page
304H83)
continued…
VL
VL
VL