GPIO Pin Assignments
(v2.0 digital boards)

GPIO Part Signal Schematic
Page		 Alternate 
Function
0 hand-held device VOL- Power 2 none
1 Xilinx FIQ/R/_B Digital 4 none
2 Xilinx IRQ Digital 4 High-order data pins for split-screen color LCD support

 
3 Xilinx GPIO3 Digital 4
4 Xilinx GPIO4 Digital 4
5 Xilinx GPIO5 Digital 4
6 Xilinx GPIO6 Digital 4
7 Xilinx GPIO7 Digital 4
8 ARM 5v supply ena Power 1
9 ARM Angel heartbeat  
10 Xilinx GPIO10/CS1 Digital 4 SSP transmit
11 Xilinx PROG/ Digital 4 SSP receive
12 Xilinx DONE Digital 4 SSP serial clock
13 Xilinx INIT/ Digital 4 SSP frame clock
14       UART transmit
15 hand-held device TALK/LISTEN Power 2 UART receive
16       SDLC geoport clock out
17 hand-held device MODE1 Power 2 SDLC abort after frame control
18 hand-held device MODE2 Power 2 UART1 external clock
19 hand-held device MODE3 Power 2 SSP external clock
20       UART3 external clock
21       MCP external clock (input). Either TIC acknowledge or MBGNT (output).
22 hand-held device MODE4 Power 2 Either TIC request A or MBREQ
23 hand-held device VOL+ Power 2 TIC request B
24 20MHz oscillator EN (shutdown) Digital 4 none
25 codec RESET/ Digital 5 RTC trimmed 1-Hz clock
26 flash RDY/_BSY Digital 3 Internal clock/2

27

 reserved for RTC calibration Raw 32.768-kHz oscillator output

Color codes:
    Not available for general use. 
    Available after boot.
    Driven by buffers on v1 power board, available if v2 power board is used.
    Available if codec is not installed on digital board.