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DP83924 Datasheet(PDF) 30 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83924
Description  Quad 10 Mb/s Ethernet Physical Layer - 4TPHY?
PDF  42 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83924 Datasheet(HTML) 30 Page - National Semiconductor (TI)

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6.0 User Information (Continued)
30
www.national.com
6.6 Link pulse template:
Issue:
The 924B will not link if the received NLPs have under-
shoot exceeding 800 mV for a duration exceeding 80 ns.
Description:
IEEE 802.3 Clause 14, section 14.3.1.2.1 Figure 14-12
shows the template for link test pulse. This template allows
undershoot up to -3.1V. For link pulses fitting this template
but having large undershoot, the 924B will not correctly
detect link.
Impact:
We don’t believe the above is a problem, because there
are no NIC cards which have the extreme undershoots
allowed in the above template. The 924B is robust enough
to link even with NLPs having large undershoot, as long as
the undershoot doesn’t exceed -800 mV and lasts less
than 80 ns.
Die Revision Plan:
None.



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