TLK100_11 Datasheet, PDF (33/88 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
To disable the auto-negotiation function during operation, clear register BMCR (0x0000h) bit 12. During
operation, setting/resetting this register does not affect the TLK100 operation. For the changes to take
place, issue a restart command through register BMCR (0x0000h) bit 9.
5.5.3 Configuration Bits
The auto-negotiation options can be configured through the configuration bits AN_EN, AN_1 and AN_0 as
described in Table 5-3. 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 5-3. Auto-Negotiation Modes
AN_1
0
0
1
1
AN1
0
0
1
1
AN_0
0
1
0
1
AN0
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
5.5.4 Next Page Support
The TLK100 supports the optional feature of the transmission and reception of auto-negotiation additional
(vendor specific) next pages.
If next pages are needed, then the user must set register ANAR(0x0004h) bit 15 to '1'. The next pages are
then sent and received through registers ANNPTR(0x0007h) and ANLNPTR(0x0008h), respectively. The
user must poll register ANER(0x0006h) bit 1 to check whether a new page has been received, and then
read register ANLNPTR for the received next page's content. Only after register ANLNPTR is read may
the user write to register ANNPTR the next page to be transmitted. After register ANNPTR is written, new
next pages overwrite the contents of register ANLNPTR.
If register ANAR(0x0004h) bit 15 is set, then the next page sequence is controlled by the user, meaning
that the auto-negotiation function always waits for register ANNPTR to be written before transmitting the
next page.
If additional user-defined next pages are transmitted and the link partner has more next pages to send, it
is the user's responsibility to keep writing null pages (of value 0x2001) to register ANNPTR until the link
partner notifies that it has sent its last page (by setting bit 15 of its transmitted next page to zero).
Copyright © 2009, Texas Instruments Incorporated
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