DP83640_14 Datasheet, PDF (115/129 Pages) Texas Instruments – Precision PHYTER - IEEE® 1588 Precision Time Protocol Transceiver

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DP83640
SNOSAY8D – SEPTEMBER 2007 – REVISED NOVEMBER 2012
NOTE
These specifications represent transmit timings.
4.4.2.21 100BASE-TX Signal Detect Timing
PMD Input
Pair
SD+ internal
T2.21.1
T2.21.2
Figure 4-21. 100BASE-TX Signal Detect Timing
Parameter
Description
Notes
Min
Typ
Max
Units
T2.21.1
SD Internal Turn-on Time
1
ms
T2.21.2
SD Internal Turn-off Time
Default operation
Fast link-loss indication enabled
250
300
µs
1.3
µs
NOTE
The signal amplitude on PMD Input Pair must be TP-PMD compliant.
NOTE
Fast Link-loss detect is enabled by setting the SD_CNFG[8] register bit to a 1.
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Electrical Specifications 115