ICS1892 Integrated Circuit Systems, ICS1892 Datasheet - Page 41
ICS1892
Manufacturer Part Number
ICS1892
Description
10Base-T/100Base-TX Integrated PHYceiver
Manufacturer
Integrated Circuit Systems
Datasheet
1.ICS1892.pdf
(148 pages)
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7.3 Functional Block: 100Base-X PCS and PMA Sublayers
7.3.1 PCS Sublayer
7.3.2 PMA Sublayer
ICS1892, Rev. D, 2/26/01
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.
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:
•
•
•
Note:
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:
•
•
•
•
•
PCS Transmit sublayer, which provides the following:
PCS Receive sublayer, which provides the following:
Two PCS controls, which provide the following functions for the MAC/Repeater Interface:
Link Monitoring
Carrier Detection
NRZI encoding/decoding
Transmit Clock Synthesis
Receive Clock Recovery
– Parallel-to-serial conversion
– 4B/5B encoding
– Collision detection
– Serial-to-parallel conversion
– 4B/5B encoding
– Carrier detection
– Code group framing
– 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)
ICS1892
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.
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
41
Chapter 7 Functional Blocks
February 26, 2001
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