Uart - SMART Embedded Computing COMX-P2020 Installation And Use Manual

Functional Description
Table 4-1
Name
GPIO 2
GPIO 3
GPIO 4
GPIO 5
GPIO 6
GPIO 7
GPIO 8
GPIO 9
GPIO 10
GPIO 11
GPIO 12
GPIO 13
GPIO 14
GPIO 15
4.11

UART

The COMX-P2020 Module consists of two universal asynchronous receiver/transmitters
(UARTs). The UARTs act independently. Each UART is clocked by the platform clock
(600MHz). The DUART programming model is compatible with the PC16552D.
76
GPIO Description (continued)
Intput/ Output Reset Value
Input
Input
Output 0
Output 0
Output 0
Output 0
Output 0
Input
Output 1
Input
Input
Input
Description
connected to the COM Express carrier board
connected to the COM Express carrier board
connected to the COM Express carrier board
connected to the COM Express carrier board
connected to the COM Express carrier board
connected to the COM Express carrier board
Multiplex as SDHC_CD: which is used to check if
the SD insert or not.
Multiplex as SDHC_WP: which is used to check
the SD is write protect or not.
can be used to clear WDT timer.
If the pin is set to 1, the WDT timer will be cleared.
connected to the COM Express carrier board
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.
connected to the COM Express carrier board
connected to the COM Express carrier board
connected to the COM Express carrier board
COMX-P2020 Module Installation and Use (6806800K97F)
Functional Description