ICS1893 datasheet(19/152 Pages) ICST

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Chapter 5

Operating Modes Overview

ICS1893 Rev C 6/6/00

June, 2000

ICS1893 - Release

Chapter 5

Operating Modes Overview

The ICS1893 operating modes and interfaces are configurable with one of two methods. The HW/SW

(hardware/software) pin determines which method the ICS1893 is to use, either its hardware pins or its

hardware pins have priority over the internal registers for establishing the configuration settings of the

ICS1893. When the HW/SW bit is logic one the ICS1893 is in software mode. In software mode, the

internal register bits have priority over the hardware pins for establishing the configuration settings of the

ICS1893. The register bits are typically controlled from software.

The ICS1893 register bits are accessible through a standard MII (Media Independent Interface) Serial

Management Port. Even when the ICS1893 MAC/Repeater Interface is not supporting the standard MII

Data Interface, access to the Serial Management Port is provided (that is, operation of the Serial

Management Port is independent of the MAC/Repeater Interface configuration).

The ICS1893 provides a number of configuration functions to support a variety of operations. For example,

the MAC/Repeater Interface can be configured to operate as a 10M MII, a 100M MII, a 100M Symbol

Interface, a 10M Serial Interface, or a Link Pulse Interface. The protocol on the Medium Dependent

Interface (MDI) can be configured to support either 10M or 100M operations in either half-duplex or

full-duplex modes.

The ICS1893 is fully compliant with the ISO/IEC 8802-3 standard, as it pertains to both 10Base-T and

100Base-TX operations. The feature-rich ICS1893 allows easy migration from 10-Mbps to 100-Mbps

operations as well as from systems that require support of both 10M and 100M links.

This chapter is an overview of the following ICS1893 modes of operation:

• Section 5.1, “Reset Operations”

• Section 5.2, “Power-Down Operations”

• Section 5.3, “Automatic Power-Saving Operations”

• Section 5.4, “Auto-Negotiation Operations”

• Section 5.5, “100Base-TX Operations”

• Section 5.6, “10Base-T Operations”

• Section 5.7, “Half-Duplex and Full-Duplex Operations”

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