ICS1893AF datasheet(40/137 Pages) RENESAS

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ICS1893AF, Rev D 10/26/04

October, 2004

Chapter 7

Functional Blocks

ICS1893AF Data Sheet - Release

7.3

Functional Block: 100Base-X PCS and PMA Sublayers

The ICS1893AF is fully compliant with clause 24 of the ISO/IEC specification, which defines the 100Base-X

Physical Coding sublayer (PCS) and Physical Medium Attachment (PMA) sublayers.

7.3.1

PCS Sublayer

The ICS1893AF 100Base-X PCS sublayer provides two interfaces: one to a MAC/repeater and the other to

the ICS1893AF PMA sublayer. An ICS1893’s PCS sublayer performs the transmit, receive, and control

functions and consists of the following:

• PCS Transmit sublayer, which provides the following:

– Parallel-to-serial conversion

– 4B/5B encoding

– Collision detection

• PCS Receive sublayer, which provides the following:

– Serial-to-parallel conversion

– 4B/5B encoding

– Carrier detection

– Code group framing

• PCS control functions, which provide:

– Assertion of the CRS (carrier sense) signal

– Assertion of the COL (collision detection) signal

7.3.2

PMA Sublayer

The ICS1893AF 100Base-X PMA Sublayer consists of two interfaces: one to the Physical Coding sublayer

and the other to the Physical Medium Dependent sublayer. Functionally, the PMA sublayer is responsible

for the following:

• Link Monitoring

• Carrier Detection

• NRZI encoding/decoding

• Transmit Clock Synthesis

• Receive Clock Recovery

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