FLLXT971ABC.A4 Intel, FLLXT971ABC.A4 Datasheet - Page 59

• Manufacturer Part Number: FLLXT971ABC.A4
• Manufacturer: Intel

Specifications of FLLXT971ABC.A4

• Lead Free Status / RoHS Status: Not Compliant

5.9.4
Datasheet
Document Number: 249414-003
Revision Date: June 18, 2004
Figure 21. LED Pulse Stretching
LED Pulse Stretching
The LED Configuration Register also provides optional LED pulse stretching to 30, 60, or 100 ms.
The pulse stretch time is extended further if the event occurs again during this pulse stretch period.
When an event such as receiving a packet occurs, the event is edge detected and it starts the stretch
timer. The LED driver remains asserted until the stretch timer expires. If another event occurs
before the stretch timer expires, then the stretch timer is reset and the stretch time is extended.
When a long event (such as duplex status) occurs, the event is edge detected and it starts the stretch
timer. When the stretch timer expires, the edge detector is reset so that a long event causes another
pulse to be generated from the edge detector, which resets the stretch timer and causes the LED
driver to remain asserted.
Figure 21
Event
LED
Note: The direct drive LED outputs in this diagram are shown as active L ow.
shows how the stretch operation functions.
stretch
Intel
stretch
®
LXT971A Single-Port 10/100 Mbps PHY Transceiver
stretch
B3475-01
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