ICS1893CKIT datasheet(7/127 Pages) IDT

Part #	ICS1893CKIT

Description	3.3-V 10Base-T/100Base-TX Integrated PHYceiver?

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Chapter 3 Overview of the ICS1893CF

ICS1893CF, Rev. J, 08/11/09

August, 2009

7

ICS1893CF Data Sheet Rev. J - Release

Chapter 3 Overview of the ICS1893CF

The ICS1893CF is a stream processor. During data transmission, it accepts sequential nibbles from its

MAC (Media Access Control) converts them into a serial bit stream, encodes them, and transmits them

over the medium through an external isolation transformer. When receiving data, the ICS1893CF converts

and decodes a serial bit stream (acquired from an isolation transformer that interfaces with the medium)

into sequential nibbles. It subsequently presents these nibbles to its MAC Interface.

The ICS1893CF implements the OSI model’s physical layer, consisting of the following, as defined by the

ISO/IEC 8802-3 standard:

• Physical Coding sublayer (PCS)

• Physical Medium Attachment sublayer (PMA)

• Physical Medium Dependent sublayer (PMD)

• Auto-Negotiation sublayer

The ICS1893CF is transparent to the next layer of the OSI model, the link layer. The link layer has two

sublayers: the Logical Link Control sublayer and the MAC sublayer. The ICS1893CF can interface directly

to the MAC.

The ICS1893CF transmits framed packets acquired from its MAC Interface and receives encapsulated

packets from another PHY, which it translates and presents to its MAC Interface.

Note: As per the ISO/IEC standard, the ICS1893CF does not affect, nor is it affected by, the underlying

structure of the MAC frame it is conveying.

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