10 gpio, Table 4-1, Gpio description – Artesyn COMX-P2020 Installation and Use (February 2015) User Manual
Page 83: Functional description
Functional Description
COMX-P2020 Module Installation and Use (6806800K97E)
83
4.10 GPIO
There are total 14 GPIO PIN used at COMX-P2020; GPIO8 and GPIO9 are used for SDHC
function.
Table 4-1 GPIO Description
Name
Intput/ Output Reset Value Description
GPIO 0
Input
connected to the COM Express carrier board
GPIO 1
Input
connected to the COM Express carrier board
GPIO 2
Input
connected to the COM Express carrier board
GPIO 3
Input
connected to the COM Express carrier board
GPIO 4
Output
0
connected to the COM Express carrier board
GPIO 5
Output
0
connected to the COM Express carrier board
GPIO 6
Output
0
connected to the COM Express carrier board
GPIO 7
Output
0
connected to the COM Express carrier board
GPIO 8
Multiplex as SDHC_CD: which is used to check if
the SD insert or not.
GPIO 9
Multiplex as SDHC_WP: which is used to check
the SD is write protect or not.
GPIO 10
Output
0
can be used to clear WDT timer.
If the pin is set to 1, the WDT timer will be
cleared.
GPIO 11
Input
connected to the COM Express carrier board
GPIO 12
Output
1
If this pin is set to 1, and s3[14] is set to OFF, then
Serdes#2 is switch to COMe PCI #2;
If this pin is set to 0, or s3[14] is set to ON, then
Serdes#2 is switch to GEPHY2.
For COMX-P2020, GPIO[12] must be set to 1 and
s3[14] must be set to OFF.
GPIO 13
Input
connected to the COM Express carrier board
GPIO 14
Input
connected to the COM Express carrier board
GPIO 15
Input
connected to the COM Express carrier board