ICS1893 datasheet(34/152 Pages) ICST

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ICS1893 Rev C 6/6/00

June, 2000

Chapter 6

Interface Overviews

ICS1893 Data Sheet - Release

6.6

Clock Reference Interface

The REF_IN pin provides the ICS1893 Clock Reference Interface. The ICS1893 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

ICS1893 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.

6.7

Configuration Interface

The following Configuration and Status Interface pins allow the ICS1893 to be completely configured and

controlled in hardware mode:

• 10/100SEL

• ANSEL

• DPXSEL

• HW/SW

• MII/SI

• NOD/REP

• RESETn

• RXTRI

These pins allow the ICS1893 to accommodate the following:

• 10M or 100M operations

• Four MAC/Repeater Interface configurations:

– 10M MII

– 100M MII

– 100M Symbol

– 10M Serial

• Node or repeater applications

• Full-duplex or half-duplex data links

In addition to the ISO/IEC-specified, MII control signals, the ICS1893 provides RXTRI, which is a tri-state

enable pin for the MII receive data path. When this pin is active (that is, a logic one), the following pins are

tri-stated:

• RXCLK

• RXD[3:0]

• RXDV

• RXER

Functionally, the RXTRI pin affects the MII receive channel in the same way as the Control Register’s

isolate bit, bit 0.10. (The isolate bit also affects the transmit data path.) The ICS1893 can tri-state these

seven signals for all five types of MAC/Repeater Interface configurations, not just the MII interface.

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