ICS1893CF datasheet(15/127 Pages) IDT

номер детали	ICS1893CF

подробное описание детали	3.3-V 10Base-T/100Base-TX Integrated PHYceiver?

PDF	127 Pages

Scroll/Zoom	100%

производитель	IDT [Integrated Device Technology]

домашняя страница	http://www.idt.com

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15 / 127 page

Chapter 4 Operating Modes Overview

ICS1893CF, Rev. J, 08/11/09

August, 2009

ICS1893CF Data Sheet Rev. J - Release

4.8 Auto-MDI/MDIX Crossover (New)

The ICS1893CF includes the auto-MDI/MDIX crossover feature. In a typical CAT 5 Ethernet installation the

transmit twisted pair signal pins of the RJ45 connector are crossed over in the CAT 5 wiring to the partners

receive twisted pair signal pins and receive twisted pair to the partners transmit twisted pair. This is usually

accomplished in the wiring plant. Hubs generally wire the RJ45 connector crossed to accomplish the

crossover. Two types of CAT 5 cables (straight and crossed) are available to achieve the correct

connection. The Auto-MDI/MDIX feature automatically corrects for miss-wired installations by automatically

swapping transmit and receive signal pairs at the PHY when no link results. Auto-MDI/MDIX is automatic,

but may be disabled for test purposes using the AMDIX_EN pin or by writing MDIO register 19 Bits 9:8 in

the MDIO register. The Auto-MDI/MDIX function is independent of Auto-Negotiation and preceeds

Auto-Negotiation when enabled.

ICS1893CF датащи(PDF) 15 Page - Integrated Device Technology