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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ICS1893AG датащи(PDF) 39 Page - Integrated Circuit Systems |
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ICS1893AG датащи(HTML) 39 Page - Integrated Circuit Systems |
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39 / 135 page  Chapter 7 Functional Blocks ICS1893AG, Rev. A 04/14/05 April, 2005 39 ICS1893AG Data Sheet - Preliminary Copyright © 2005, Integrated Circuit Systems, Inc. All rights reserved. 7.3 Functional Block: 100Base-X PCS and PMA Sublayers The ICS1893AG 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 ICS1893AG 100Base-X PCS sublayer provides two interfaces: one to a MAC/repeater and the other to the ICS1893AG 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 ICS1893AG 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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