ICS1893CFILF datasheet(29/126 Pages) ICST

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Chapter 6 Functional Blocks

ICS1893CF, Rev. F, 03/01/07

Mar. 2007

ICS1893CF Data Sheet Rev. F - Release

6.2.5 Auto-Negotiation: Progress Monitor

Under typical circumstances, the Auto-Negotiation sublayer can establish a connection with the

ICS1893CF’s remote link partner. However, some situations can prevent the auto-negotiation process from

properly achieving this goal. For these situations, the ICS1893CF has an Auto-Negotiation Progress

Monitor to provide detailed status information to its Station Management (STA) entity. With this status

information, the STA can diagnose the failure mechanism and – in some situations – establish the link by

correcting the problem.

When enabled, the auto-negotiation process typically requires less than 500 ms to execute, independent of

the link partner's ability to perform the auto-negotiation process. Typically, an STA polls both the

Auto-Negotiation Complete bit (bit 1.5) and the Link Status bit (bit 1.2) to determine when a link is

successfully established, either through auto-negotiation or parallel detection. The STA can then poll the

Auto-Negotiation Link Partner Ability Register and determine the highest-performance operating mode in

common with the capabilities it is advertising.

6.3 Functional Block: 100Base-X PCS and PMA Sublayers

The ICS1893CF 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.

6.3.1 PCS Sublayer

The ICS1893CF 100Base-X PCS sublayer provides two interfaces: one to a MAC and the other to the

ICS1893CF 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

6.3.2 PMA Sublayer

The ICS1893CF 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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