User Guide

LM960 HW Design Guide
1VV0301485 Rev. 3 Page 46 of 74 2018-12-14
The recommended WAN_LED_N connection is the following:
Recommended WAN_LED_N connection
6.5.5. General Purpose I/O
The general-purpose I/O pins can be configured to act in three different ways:
 Input
 Output
 Dedicate Function (Customer Requirement)
Input pins can only be read and report digital values (high or low) present on the pin at the
read time. Output pins can only be written or queried and set the value of the pin output.
The following GPIOs are always available as a primary function on the LM960.
Below table lists the GPIO signals of LM960.
GPIOs
Pin no. Signal I/O Function Type Drive
Strength
3 GPIO_01 I/O Configurable
GPIO
Pull-Down
1.8V
2-16 mA
5 GPIO_02 I/O Configurable
GPIO
Pull-Down
1.8V
2-16 mA
44 GPIO_03 I/O Configurable
GPIO
Pull-Down
1.8V
2-16 mA
46 GPIO_04 I/O Configurable
GPIO
Pull-Down
1.8V
2-16 mA
6.5.5.1. Using a GPIO Pin as Input
GPIO pins, when used as inputs, can be tied to a digital output of another device and
report its status, provided the device interface levels are compatible with the GPIO 1.8V
CMOS levels.
If a digital output of a device is tied to GPIO input, the pin has interface levels different
than 1.8V CMOS. It can be buffered with an open collector transistor with a 47 k pull-up
resistor to 1.8V.