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ICS1893CFIT Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS1893CFIT Datasheet(HTML) 8 Page - Integrated Circuit Systems |
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8 / 126 page  ICS1893CF, Rev. F, 03/01/07 Mar. 2007 8 Chapter 3 Overview of the ICS1893CF ICS1893CF Data Sheet - Release Copyright © 2007, Integrated Device Technology, Inc. All rights reserved. 3.1 100Base-TX Operation During 100Base-TX data transmission, the ICS1893CF accepts packets from a MAC and inserts Start-of-Stream Delimiters (SSDs) and End-of-Stream Delimiters (ESDs) into the data stream. The ICS1893CF encapsulates each MAC frame, including the preamble, with an SSD and an ESD. As per the ISO/IEC Standard, the ICS1893CF replaces the first octet of each MAC preamble with an SSD and appends an ESD to the end of each MAC frame. When receiving data from the medium, the ICS1893CF removes each SSD and replaces it with the pre-defined preamble pattern before presenting the nibbles to its MAC Interface. When the ICS1893CF encounters an ESD in the received data stream, signifying the end of the frame, it ends the presentation of nibbles to its MAC Interface. Therefore, the local MAC receives an unaltered copy of the transmitted frame sent by the remote MAC. During periods when MAC frames are being neither transmitted nor received, the ICS1893CF signals and detects the IDLE condition on the Link Segment. In the 100Base-TX mode, the ICS1893CF transmit channel sends a continuous stream of scrambled ones to signify the IDLE condition. Similarly, the ICS1893CF receive channel continually monitors its data stream and looks for a pattern of scrambled ones. The results of this signaling and monitoring provide the ICS1893CF with the means to establish the integrity of the Link Segment between itself and its remote link partner and inform its Station Management Entity (STA) of the link status. For 100M data transmission, the ICS1893CF MAC Interface is configured to provide a 100M Media Independent Interface (MII). 3.2 10Base-T Operation During 10Base-T data transmission, the ICS1893CF inserts only the IDL delimiter into the data stream. The ICS1893CF appends the IDL delimiter to the end of each MAC frame. However, since the 10Base-T preamble already has a Start-of-Frame delimiter (SFD), it is not required that the ICS1893CF insert an SSD-like delimiter. When receiving data from the medium (such as a twisted-pair cable), the ICS1893CF uses the preamble to synchronize its receive clock. When the ICS1893CF receive clock establishes lock, it presents the preamble nibbles to its MAC Interface. The 10M MAC Interface uses the standard MII Interface. In 10M operations, during periods when MAC frames are being neither transmitted nor received, the ICS1893CF signals and detects Normal Link Pulses. This action allows the integrity of the Link Segment with the remote link partner to be established and then reported to the ICS1893CF’s STA. |
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