LAN9353 Datasheet, PDF (492/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
Bits
Description
7:0 GPIO Buffer Type 7-0 (GPIOBUF[7:0])
This field sets the buffer types of the 8 GPIO pins.
0: Corresponding GPIO pin configured as an open-drain driver
1: Corresponding GPIO pin configured as a push/pull driver
As an open-drain driver, the output pin is driven low when the corresponding
data register is cleared, and is not driven when the corresponding data regis-
ter is set.
As an open-drain driver used for 1588 Clock Events, the corresponding
GPIO_POL_x bit determines when the corresponding pin is driven per the
following table:
GPIOx Clock Event Polarity
0
0
1
1
1588 Clock Event
no
yes
no
yes
Pin State
not driven
driven low
driven low
not driven
Type
R/W
Default
00h
DS00001925A-page 492
 2015 Microchip Technology Inc.