LAN9730 Datasheet, PDF (133/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
Bits
17:16
Description
GPIO 8 Control (GPCTL8)
The value of this field determines the function of the external GPIO8 pin as fol-
lows:
Type
R/W
Default
00b
00 = GPIO8
01 = Note 6-6
10 = RXD2
11 = CRS
Note:
When enabled as RXD2 or CRS, the external device pin will reflect
the state of the corresponding internal MII signal. This feature is
useful as a diagnostic tool.
15:11 RESERVED
RO
10:8 GPIO Buffer Type (GPBUF[10:8])
R/W
When set, the output buffer for the corresponding GPIO signal is configured
as a push/pull driver. When cleared, the corresponding GPIO signal is config-
ured as an open-drain driver. Bits are assigned as follows:
-
000b
GPBUF8 – bit 8
GPBUF9 – bit 9
GPBUF10 – bit 10
7 RESERVED
RO
6:4 GPIO Direction (GPDIR[10:8])
R/W
When set, enables the corresponding GPIO as an output. When cleared the
GPIO is enabled as an input. Bits are assigned as follows:
-
000b
GPDIR8 – bit 4
GPDIR9 – bit 5
GPDIR10 – bit 6
3 RESERVED
RO
2:0 GPIO Data (GPD[10:8])
R/W
When enabled as an output, the value written is reflected on GPIOn. When
read, GPIOn reflects the current state of the corresponding GPIO pin. Bits are
assigned as follows:
-
Note 6-7
Note 6-5
Note 6-6
Note 6-7
GPD8 – bit 0
GPD9 – bit 1
GPD10 – bit 2
The default value for this bit is 0 when no EEPROM is present. If an EEPROM is present, the default
value is the value of the LED Select bit in the Configuration Flags of the EEPROM. A USB Reset or
Lite Reset (LRST) will cause this bit to be restored to the image value last loaded from EEPROM, or
to be set to 0 if no EEPROM is present.
Determined by the LED Select (LED_SEL) setting.
The default value depends on the state of the GPIO pin.
 2012-2015 Microchip Technology Inc.
DS00001946A-page 133