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ICS1893AF 数据表(PDF) 86 Page - Renesas Technology Corp |
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ICS1893AF 数据表(HTML) 86 Page - Renesas Technology Corp |
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86 / 137 page  ICS1893AF, Rev D 10/26/04 October, 2004 86 Chapter 8 Management Register Set ICS1893AF Data Sheet - Release Copyright © 2004, Integrated Circuit Systems, Inc. All rights reserved. 8.11.7 Invalid Error Code Test (bit 16.2) The Invalid Error Code Test bit allows an STA to force the ICS1893AF to transmit symbols that are typically classified as invalid. The purpose of this test bit is to permit thorough testing of the 4B/5B encoding and the serial transmit data stream by allowing generation of bit patterns that are considered invalid by the ISO/IEC 4B/5B definition. When this bit is logic: • Zero, the ISO/IEC defined 4B/5B translation takes place. • One – and the TXER signal is asserted by the MAC/repeater – the MII input nibbles are translated according to Table 8-17. 8.11.8 ICS Reserved (bit 16.1) See Section 8.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here. 8.11.9 Stream Cipher Disable (bit 16.0) The Stream Cipher Disable bit allows an STA to control whether the ICS1893AF employs the Stream Cipher Scrambler in the transmit and receive data paths. When this bit is set to logic: • Zero, the Stream Cipher Encoder and Decoder are both enabled for normal operations. • One, the Stream Cipher Encoder and Decoder are disabled. This action results in an unscrambled data stream (for example, the ICS1893AF transmits unscrambled IDLES, and so forth. Note: The Stream Cipher Scrambler can be used only for 100-MHz operations. Table 8-17. Invalid Error Code Translation Table Symbol Meaning MII Input Nibble Translation V Invalid Code 0000 00000 V Invalid Code 0001 00001 V Invalid Code 0010 00010 V Invalid Code 0011 00011 H Error 0100 00100 V Invalid Code 0101 00101 V Invalid Code 0110 00110 R ESD 0111 00111 V Invalid Code 1000 00000 T ESD 1001 01101 V Invalid Code 1010 01100 K SSD 1011 10001 V Invalid Code 1100 10000 V (S) Invalid Code 1101 11001 J SSD 1110 11000 I Idle 1111 11111 |
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