ICS1894-40 datasheet(11/52 Pages) IDT

Part #	ICS1894-40

Description	10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

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Manufacturer	IDT [Integrated Device Technology]

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ICS1894-40

10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

PHYCEIVER

IDT™ / ICS™ 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE 11

ICS1894-40

REV C 092909

Auto-MDI/MDIX Crossover

The ICS1894-40 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.

Power Management

Clock Reference Interface

The REF_IN pin provides the ICS1894-40 Clock Reference

Interface. The ICS1894-40 requires a single clock reference

with a frequency of 25 MHz ±50 parts per million. This

accuracy is necessary to meet the interface requirements of

the ISO/IEEE 8802-3 standard, specifically clauses 22.2.2.1

and 24.2.3.4. The ICS1894-40 supports two clock source

configurations: a CMOS oscillator or a CMOS driver. The

input to REF_IN is CMOS (10% to 90% VDD), not TTL.

Alternately, a 25MHz crystal may be used.

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Integrated Device Techn...	ICS1894-40	341Kb / 53P	10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
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ICS1894-40 Datasheet(PDF) 11 Page - Integrated Device Technology

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