ICS1893AFILF datasheet(46/137 Pages) RENESAS

46 / 137 page

ICS1893AF, Rev D 10/26/04

October, 2004

Chapter 7

Functional Blocks

ICS1893AF Data Sheet - Release

7.4.7

100Base-TX Operation: Auto Polarity Correction

The ICS1893AF 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 ICS1893AF 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 ICS1893AF 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”.

ICS1893AFILF 数据表(PDF) 46 Page - Renesas Technology Corp