ics1893ck-40 Integrated Device Technology, ics1893ck-40 Datasheet - Page 15
ics1893ck-40
Manufacturer Part Number
ics1893ck-40
Description
3.3-v 10base-t/100base-tx Integrated Phyceiver
Manufacturer
Integrated Device Technology
Datasheet
1.ICS1893CK-40.pdf
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4.8 Auto-MDI/MDIX Crossover (New)
ICS1893CK-40, Rev. C, 06/02/09
The ICS1893CK-40 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 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.
ICS1893CK-40 Data Sheet Rev. C - Release
Copyright © 2009, Integrated Device Technology, Inc.
All rights reserved.
15
Chapter 4 Operating Modes Overview
June 2009
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