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ICS1893BKILF Datasheet(PDF) 22 Page - Renesas Technology Corp |
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ICS1893BKILF Datasheet(HTML) 22 Page - Renesas Technology Corp |
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22 / 133 page  ICS1893BF, Rev. F, 5/13/10 May, 2010 22 Chapter 4 Operating Modes Overview ICS1893BF Data Sheet - Release Copyright © 2009, IDT, Inc. All rights reserved. 4.8 Auto-MDI/MDIX Crossover (New) The ICS1893BF 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. |
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