WJLXT972MLC.A4 S L7U9 Intel, WJLXT972MLC.A4 S L7U9 Datasheet - Page 53

• Manufacturer Part Number: WJLXT972MLC.A4 S L7U9
• Manufacturer: Intel

Specifications of WJLXT972MLC.A4 S L7U9

• Lead Free Status / RoHS Status: Compliant

5.9.3
Datasheet
Document Number: 302875-005
Revision Date: 27-Oct-2005
LED Functions
The LXT972M Transceiver has these direct LED driver pins: LED/CFG1, LED/CFG2, and LED/
CFG3.
On power-up, all the drivers are asserted for approximately 1 second after reset de-asserts. Each
LED driver can be programmed using the LED Configuration Register
Configuration Register - Address 20, Hex 14” on page
conditions:
The LED drivers can also be programmed to display various combined status conditions. For
example, setting Register bits 20.15:12 to ‘1101’ produces the following combination of Link and
Activity indications:
For the LXT972M Transceiver, the LED driver pins also provide initial configuration settings. The
LED pins are sensitive to polarity and automatically pull up or pull down to configure for either
open drain or open collector circuits (10 mA Max current rating) as required by the hardware
configuration. For details, see the discussion of
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Collision Condition
Duplex Mode
Link Status
Operating Speed
Receive Activity
Transmit Activity
If Link is down, LED is off. If activity is detected from the MAC, the LED still blinks even if
the link is down.
If Link is up, LED is on.
If Link is up and activity is detected, the LED blinks at the stretch interval selected by Register
bits 20.3:2 and continues to blink as long as activity is present.
Intel
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver
“Hardware Configuration Settings” on page
87) to indicate one of the following
(Table 54, “LED
33.
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