LAN9303 Datasheet, PDF (33/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
Table 3.5 GPIO/LED/Configuration Straps (continued)
NUM
PINS
NAME
LED 4
GPIO 4
1
Serial
Management
Mode[1] and
LED 4 Polarity
Configuration
Strap
SYMBOL
LED4
GPIO4
MNGT1_LED4P
BUFFER
TYPE
DESCRIPTION
O12/
OD12/
OS12
This pin is configured to operate as an LED when
the LED 4 Enable bit in the LED Configuration
Register (LED_CFG) is set. The buffer type
depends on the setting of the LED Function 1-0
(LED_FUN[1:0]) field in the LED Configuration
Register (LED_CFG) and is configured to be either
an push-pull or open-drain/open-source output.
When selected as an open-drain/open-source
output, the polarity of this pin depends up the
MNGT1_LED4P strap value sampled at reset.
IS/O12/
OD12
(PU)
This pin is configured to operate as a GPIO when
the LED 4 Enable bit of the LED Configuration
Register (LED_CFG) is clear. The pin is fully
programmable as either a push-pull output, an
open-drain output, or a Schmitt-triggered input by
writing the General Purpose I/O Configuration
Register (GPIO_CFG) and the General Purpose
I/O Data & Direction Register (GPIO_DATA_DIR).
IS
(PU)
This strap configures the Serial Management
Mode, as well as the polarity of the LED 4 pin when
it is an open-drain or open-source output. See
Note 3.6.
If the strap value is 0:
The LED is set as active high, since it is assumed
that a LED to ground is used as the pull-down.
If the strap value is 1:
The LED is set as active low, since it is assumed
that a LED to VDD is used as the pull-up.
SMSC LAN9303/LAN9303i
33
DATASHEET
Revision 1.3 (08-27-09)