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TLK100 Datasheet(PDF) 13 Page - Texas Instruments |
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TLK100 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 88 page  TLK100 www.ti.com SLLS931B – AUGUST 2009 – REVISED DECEMBER 2009 3 Configuration This section includes information on the various configuration options available with the TLK100. The configuration options described below include: • Auto-Negotiation • Auto-MDIX • PHY Address • LED Interface • Loopback Functionality • BIST • Cable Diagnostics 3.1 Auto-Negotiation The TLK100 device can auto-negotiate to operate in 10BASE-T or 100BASE-TX. If Auto-Negotiation is enabled, then the TLK100 device negotiates with the link partner to determine the speed and duplex with which to operate. If the link partner is unable to Auto-Negotiate, the TLK100 device would go into the parallel detect mode to determine the speed of the link partner. Under parallel detect mode, the duplex mode is fixed at half-duplex. The TLK100 supports four different Ethernet protocols (10 Mb/s Half Duplex, 10 Mb/s Full Duplex, 100 Mb/s Half Duplex, and 100 Mb/s Full Duplex), so the inclusion of Auto-Negotiation ensures that the highest performance protocol will be selected based on the advertised ability of the Link Partner. The Auto-Negotiation function within the TLK100 can be controlled either by internal register access or by the use of the AN_EN, AN_1 and AN_0 pins. The state of AN_EN, AN_0 and AN_1 pins determines whether the TLK100 is forced into a specific mode or Auto-Negotiation will advertise a specific ability (or set of abilities) as given in Table 2-1. These pins allow configuration options to be selected without requiring internal register access. The state of AN_EN, AN_0 and AN_1, upon power-up/reset, determines the state of bits [8:5] of the ANAR register (0x04h). Table 3-1. Auto-Negotiation Modes AN_EN AN_1 AN_0 Forced Mode 0 0 0 10BASE-T, Half-Duplex 0 0 1 10BASE-T, Full-Duplex 0 1 0 100BASE-TX, Half-Duplex 0 1 1 100BASE-TX, Full-Duplex AN_EN AN_1 AN_0 Advertised Mode 1 0 0 10BASE-T, Half/Full-Duplex 1 0 1 10BASE-TX, Half/Full-Duplex 1 1 0 10BASE-T, Half Duplex 100BASE-TX, Half Duplex 1 1 1 10BASE-T, Half/Full-Duplex 100BASE-TX, Half/Full-Duplex Copyright © 2009, Texas Instruments Incorporated Configuration 13 Submit Documentation Feedback Product Folder Link(s): TLK100 |
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