ICS1893AGILF datasheet(45/135 Pages) ICST

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Chapter 7 Functional Blocks

ICS1893AG, Rev. A 04/14/05

April, 2005

ICS1893AG Data Sheet - Preliminary

7.4.7 100Base-TX Operation: Auto Polarity Correction

The ICS1893AG can sense and then automatically correct a signal polarity that is reversed on its

Twisted-Pair Receiver inputs. A signal polarity reversal occurs when the input signals on the TP_RXP and

TP_RXN pins are crossed or swapped (a problem that can occur during network installation or wiring). This

function is primarily a 10Base-T function, however, it is also active during Auto-Negotiation. For more

information on the 10Base-T Auto Polarity Correction, see Section 7.5.13, “10Base-T Operation: Auto

Polarity Correction”

7.4.8 100Base-TX Operation: Isolation Transformer

The ICS1893AG interfaces with a medium through isolation transformers. The PHY requires two isolation

transformers: one for its Twisted-Pair Transmitter and the other for its Twisted-Pair Receiver. These

isolation transformers provide both physical isolation as well as the means for coupling a signal between

the ICS1893AG and the medium for both 10Base-T and 100Base-TX operations.

Note: For information on isolation transformers (also referred to as magnetic modules), see Section 6.3,

“Twisted-Pair Interface”.

ICS1893AGILF Datasheet(PDF) 45 Page - Integrated Circuit Systems