1893CKI-40LF datasheet(7/121 Pages) IDT

Part #	1893CKI-40LF

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

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Manufacturer	IDT [Integrated Device Technology]

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Chapter 3 Overview of the ICS1893CK-40

ICS1893CK-40, Rev. C, 06/02/09

June 2009

7

ICS1893CK-40 Data Sheet Rev. C - Release

Chapter 3 Overview of the ICS1893CK-40

The ICS1893CK-40 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 ICS1893CK-40

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 ICS1893CK-40 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 ICS1893CK-40 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 ICS1893CK-40 can interface

directly to the MAC.

The ICS1893CK-40 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 ICS1893CK-40 does not affect, nor is it affected by, the

underlying structure of the MAC frame it is conveying.

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