TLK100_11 Datasheet, PDF (13/88 Pages) Texas Instruments – Industrial Temp, Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver

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).
AN_EN
0
0
0
0
AN_EN
1
1
1
1
Table 3-1. Auto-Negotiation Modes
AN_1
0
0
1
1
AN_1
0
0
1
1
AN_0
0
1
0
1
AN_0
0
1
0
1
Forced Mode
10BASE-T, Half-Duplex
10BASE-T, Full-Duplex
100BASE-TX, Half-Duplex
100BASE-TX, Full-Duplex
Advertised Mode
10BASE-T, Half/Full-Duplex
10BASE-TX, Half/Full-Duplex
10BASE-T, Half Duplex
100BASE-TX, Half Duplex
10BASE-T, Half/Full-Duplex
100BASE-TX, Half/Full-Duplex
Copyright © 2009, Texas Instruments Incorporated
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Configuration
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