Eurotech Appliances VIPER / VIPER-LITE PXA255 - Manual (Page 22)

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
285H
30
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
47H
Interrupt assignments
(page
284H
30 )
5 0 Reserved Input NA Input Reserved
286H
Reserved – LK2 (page
287H
98 )
6 0 PSU_DATA Output NA 0 Microprocessor Core
Voltage DAC Data
288H
Processor power
management
(page
289H
81 )
7 0 USER_CONFIG1 Input NA Input User Config 1, Jumper
LK3
290H
User configurable jumper
1 – LK3
(page
291H
98 )
8 0 CF_RDY Input NA Input CompactFLASH
Ready/nBusy
48H
Interrupt assignments ,
(page
292H
30 and
293H
CompactFLASH
page
294H
28 )
9 0 BLKEN Output High 0 LCD Backlight Enable
295H
LCD backlight enable
(page
296H
37 )
10 0 LCDEN Output High 0 LCD Logic Supply
Enable
297H
LCD logic supply enable
(page
298H
37 )
11 0 PSU_CLK Output 0 Microprocessor Core
Voltage DAC Clock
299H
Processor power
management
(page
300H
81 )
12 0 SHDN Output High 1 COM 1, 2, 3 & 4 UART
Shutdown
301H
UART power management
(page
302H
83 )
13 0 USB_WAKEUP Output High 0 Wake Up USB Host
from suspend
303H
USB power management
(page
304H
83 )
continued …
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