ICS1892 datasheet(41/148 Pages) ICST

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Chapter 7

Functional Blocks

ICS1892, Rev. D, 2/26/01

February 26, 2001

ICS1892

7.3

Functional Block: 100Base-X PCS and PMA Sublayers

Clause 24 of the ISO/IEC specification defines the 100Base-X Physical Coding sublayer (PCS) and

Physical Medium Attachment (PMA) sublayers. The ICS1892 is fully compliant with this clause in its

implementation.

7.3.1

PCS Sublayer

The ICS1892 100Base-X PCS sublayer provides two interfaces: one to a MAC/repeater and the other to

the ICS1892 PMA sublayer. In addition, it performs the transmit, receive, and control functions in

compliance with the ISO/IEC 8802-3 standard.

The ICS1892 100Base-X PCS PCS sublayer 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

• Two PCS controls, which provide the following functions for the MAC/Repeater Interface:

– Assertion of the CRS carrier sense signal (which is part of the carrier sense modules)

– Assertion of the COL collision detection signal (which is part of the transmit modules)

Note:

When configured for 100M Symbol mode operations, the MAC/Repeater Interface bypasses most

of the PCS. When the ICS1892 MAC/Repeater Interface is in this mode, most of its PCS Transmit

and Receive modules are inactive. However, its PCS control functions (CRS and COL) remain

operational.

7.3.2

PMA Sublayer

The ICS1892 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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