TLK111_14 Datasheet, PDF (35/110 Pages) Texas Instruments – PHYTER® Industrial Temperature 10/100Mbs Ethernet Physical Layer Transceiver

TLK111
www.ti.com
SLLSEF8B – AUGUST 2013 – REVISED JANUARY 2014
When auto negotiation has started, the TLK111 transmits FLP on one twisted pair and listens on the other,
thus trying to find out whether the other link partner supports the auto negotiation function as well. The
decision on what pair to transmit/listen depends on the MDI/MDI-X state. If the other link partner activates
auto negotiation, then the two parties begin to exchange their information. If the other link partner is a
legacy PHY or does not activate the auto negotiation, then the TLK111 uses the parallel detection
function, as described in IEEE802.3 chapters 40 and 28, to determine 10B-T or 100B-TX operation
modes.
5.4.2 Initialization and Restart
The TLK111 initiates the auto negotiation function if it is enabled through the configuration jumper options
AN_EN, AN_1 and AN_0 (pins 34,35,36) and one of the following events have happened:
1. Hardware reset de-assertion
2. Software reset (via register)
3. Auto negotiation restart (via register BMCR (0x0000h) bit 9)
4. Power-up sequence (via register BMCR (0x0000h) bit 11)
The auto-negotiation function is also initiated when the auto-negotiation enable bit is set in register BMCR
(0x0000h) bit 12 and one of the following events has happened:
1. Software restart
2. Transitioning to link_fail state, as described in IEEE802.3
To disable the auto-negotiation function during operation, clear register BMCR (0x0000h) bit 12. During
operation, setting/resetting this register does not affect the TLK111 operation. For the changes to take
place, issue a restart command through register BMCR (0x0000h) bit 9.
5.4.3 Configuration Bits
The auto-negotiation options can be configured through the configuration bits AN_EN, AN_1 and AN_0 as
described in Table 5-2. The configuration bits allow the user to disable/enable the auto negotiation, and
select the desirable advertisement features.
During hardware/software reset, the values of these configuration bits are latched into the auto-negotiation
registers and available for user read and modification.
AN_EN
0
0
0
0
AN_EN
1
1
1
1
Table 5-2. 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 or Full-Duplex
100Base-TX, Half or Full-Duplex
10Base-T,Half-Duplex
100Base-TX, Half-Duplex
10Base-T,Half or Full-Duplex
100Base-TX, Half or Full-Duplex
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