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ICS1893 数据表(PDF) 40 Page - Integrated Circuit Systems |
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ICS1893 数据表(HTML) 40 Page - Integrated Circuit Systems |
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40 / 152 page  ICS1893 Rev C 6/6/00 June, 2000 40 Chapter 7 Functional Blocks ICS1893 Data Sheet - Release Copyright © 2000, Integrated Circuit Systems, Inc. All rights reserved. 7.2.1 Auto-Negotiation General Process The Auto-Negotiation sublayer uses a physical signaling technique that is transparent at the packet level and all higher protocol levels. This technique builds on the link pulse mechanism employed in 10Base-T operations and is fully compliant with clause 28 of the ISO/IEC 8802-3 standard. During the auto-negotiation process, both the ICS1893 and its remote link partner use Fast Link Pulses (FLPs) to simultaneously ‘advertise’(that is, exchange) information on their respective technology capabilities as follows: 1. For the auto-negotiation process to take place, both the ICS1893 and its remote link partner must first both support and be enabled for Auto-Negotiation. 2. The ICS1893 obtains the data for its FLP bursts from the Auto-Negotiation Advertisement Register (Register 4). 3. Both the ICS1893 and the remote link partner substitute Fast Link Pulse (FLP) bursts in place of the Normal Link Pulses (NLPs). In each FLP burst, the ICS1893 transmits information on its technology capability through its Link Control Word, which includes link configuration and status data. 4. Similarly, the ICS1893 places the Auto-Negotiation data received from its remote link partner's FLP bursts into the Auto-Negotiation Link Partner Ability Register (Register 5). 5. After the ICS1893 and its remote link partner exchange technology capability information, the ICS1893 Auto-Negotiation sublayer contrasts the data in Registers 4 and 5 and automatically selects for the operating mode the highest-priority technology that both Register 4 and 5 have in common. (That is, both the ICS1893 and its remote link partner use a predetermined priority list for selecting the operating mode, thereby ensuring that both sides of the link make the same selection.) As follows from Annex 28B of the ISO/IEC 8802-3 standard, the pre-determined technology priorities are listed from 1 (highest priority) to 5 (lowest priority): (1) 100Base-TX full duplex (2) 100Base-T4. (The ICS1893 does not support this technology.) (3) 100Base-TX (half duplex) (4) 10Base-T full duplex (5) 10Base-T (half duplex) Table 7-1 shows an example of how the selection process of the highest-priority technology takes place. 6. To indicate that the auto-negotiation process is complete, the ICS1893 sets bits 1.5 and 17.4 high to logic one. After successful completion of the auto-negotiation process, the ICS1893 Auto-Negotiation sublayer performs the following steps: a. It sets to logic one the Status Register’s Auto-Negotiation Complete bit (bit 1.5, which is also available in the QuickPoll register as bit 17.4). b. It enables the negotiated link technology (such as the 100Base Transmit modules and 100Base Receive modules). c. It disables the unused technologies to reduce the overall power consumption. Table 7-1. Example of Selection Process of Highest-Priority Technology If Register 4 Has These Technologies: If Register 5 Has These Technologies: Resulting Highest-Priority Common Technology from Auto-Negotiation Sublayer (3) 100Base-TX half duplex (1) 100Base-TX full duplex (3) 100Base-TX half duplex (4) 100Base-T full duplex (3) 100Base-TX half duplex |
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