SMSC LAN9500 - Manual (Page 15)

Hi-Speed USB 2.0 to 10/100 Ethernet Controller
Datasheet
SMSC LAN9500/LAN9500i 15 Revision 1.7 (10-02-08)
DATASHEET
1
Ethernet Link
Activity
Indicator LED
nLNKA_LED OD12
(PU)
Ethernet Link Activity Indicator LED (Active-
Low): This signal is driven low (LED on) when a
valid link is detected. This pin is pulsed high (LED
off) for 80mS whenever transmit or receive
activity is detected. This pin is then driven low
again for a minimum of 80mS, after which time it
will repeat the process if TX or RX activity is
detected. Effectively, LED2 is activated solid for a
link. When transmit or receive activity is sensed,
LED2 will function as an activity indicator.
General
Purpose I/O 9
GPIO9 IS/O12/
OD12
(PU)
General Purpose I/O 9
Note: By default this pin is configured as a
GPIO.
1
Ethernet
Speed
Indicator LED
nSPD_LED OD12
(PU)
Ethernet Speed Indicator LED (Active-Low):
This pin is driven low (LED on) when the Ethernet
operating speed is 100Mbs, or during auto-
negotiation. This pin is driven high during 10Mbs
operation, or during line isolation.
General
Purpose I/O
10
GPIO10 IS/O12/
OD12
(PU)
General Purpose I/O 10
Note: By default this pin is configured as a
GPIO.
1
Detect
Upstream
VBUS Power
VBUS_DET IS_5V
(PD)
Detect Upstream VBUS Power: Detects state of
upstream bus power. This pin must be tied to
VDD33IO when operating in bus powered mode.
1
Test 1 TEST1 - Test 1: This pin must always be connected to
VDD33IO for proper operation.
1
Test 2 TEST2 - Test 2: This pin must always be connected to
VSS for proper operation.
1
Test 3 TEST3 - Test 3: This pin must always be connected to
VSS for proper operation.
Table 2.4 Miscellaneous Pins (continued)
NUM PINS NAME SYMBOL
BUFFER
TYPE DESCRIPTION