LAN9730 Datasheet, PDF (132/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
6.3.9 LED GENERAL PURPOSE IO CONFIGURATION REGISTER (LED_GPIO_CFG)
Address:
024h
Size:
32 bits
This register configures the external GPIO[10:8] pins.
In order for a GPIO to function as a wake event or interrupt source, it must be configured as an input. GPIO pins used
to generate wake events must also be enabled by the GPIO_WAKE register, see Section 6.3.20, "General Purpose IO
Wake Enable and Polarity Register (GPIO_WAKE)".
Bits
Description
31 LED Select (LED_SEL)
This bit determines the functionality of external LED pins.
Bit
Value
Pin Name
Function
0
nSPD_LED
nLNKA_LED
nFDX_LED
Speed Indicator
Link and Activity Indicator
Full Duplex Link Indicator
1
nSPD_LED
nLNKA_LED
nFDX_LED
Note:
Hardware defaults to Activity
Indicator. Software must
manipulate to provide full-duplex
indication.
Speed Indicator
Link Indicator
Activity Indicator
Type
R/W
Default
Note 6-5
Note: This field is protected by Reset Protection (RST_PROTECT).
30:26 RESERVED
RO
-
25:24 GPIO 10 Control (GPCTL10)
R/W
00b
The value of this field determines the function of the external GPIO10 pin as
follows:
00 = GPIO10
01 = nSPD_LED (Ethernet speed indicator LED)
10 = RXD0
11 = RXD3
Note:
When enabled as RXD0 or RXD3, the external device pin will reflect
the state of the corresponding internal MII signal. This feature is
useful as a diagnostic tool.
23:22 RESERVED
RO
-
21:20 GPIO 9 Control (GPCTL9)
R/W
00b
The value of this field determines the function of the external GPIO9 pin as fol-
lows:
00 = GPIO9
01 = Note 6-6
10 = RXD1
11 = nPHY_RST
Note:
When enabled as RXD1 or nPHY_RST, the external device pin will
reflect the state of the corresponding internal MII signal. This feature
is useful as a diagnostic tool.
19:18 RESERVED
RO
-
DS00001946A-page 132
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