1893CY-10LFT IDT, 1893CY-10LFT Datasheet - Page 15
1893CY-10LFT
Manufacturer Part Number
1893CY-10LFT
Description
Ethernet ICs 3.3V 10/100 BASE TX INTEGRATED PHYCEIVER
Manufacturer
IDT
Datasheet
1.1893CFLF.pdf
(121 pages)
Specifications of 1893CY-10LFT
Rohs
yes
Part # Aliases
ICS1893CY-10LFT
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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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