TLK110 Datasheet, PDF (12/104 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK110
SLLS901A – DECEMBER 2011 – REVISED FEBRUARY 2012
3.3 IO Pins Hi-Z State During Reset
The following IO or output pins are in hi-Z state when RESETN is active (Low).
Pin Name
MII_TXD_3
MII_TX_EN
PWRDNN
LED_ACT
LED_SPEED
LED_LINK
MDIO
MII_RX_DV
MII_CRS
MII_RX_ER
MII_COL
MII_RXD_0
MII_RXD_1
MII_RXD_2
MII_RXD_3
MII_TX_CLK
CLK25MHZ_OUT
MII_RX_CLK
Type
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
O
O
O
Internal
PU/PD
PD
PD
PU
PU
PU
PU
PD
PU
PU
PU
PD
PD
PD
PD
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3.4 Auto-Negotiation
The TLK110 device can auto-negotiate to operate in 10Base-T or 100Base-TX. If Auto-Negotiation is
enabled, the TLK110 negotiates with the link partner to determine the speed and duplex mode with which
to operate. If the link partner is unable to Auto-Negotiate, the TLK110 device goes into parallel-detect
mode to determine the speed of the link partner. Under parallel-detect mode, the duplex mode is fixed at
half-duplex.
The TLK110 supports four different Ethernet protocols (10Mbs Half-Duplex, 10Mbs Full-Duplex, 100Mbs
Half-Duplex, and 100Mbs Full-Duplex). Auto-Negotiation selects the highest performance protocol based
on the advertised ability of the Link Partner. The Auto-Negotiation function within the TLK110 can be
controlled either by internal register access or by configuring the AN_EN, AN_1 and AN_0 pins.
The state of the AN_EN, AN_0 and AN_1 pins determine whether the TLK110 is forced into a specific
mode, or if Auto-Negotiation advertises a specific ability (or set of abilities) as given in Table 3-1. 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
12
Hardware Configuration
Table 3-1. Auto-Negotiation Modes
AN_1
0
0
1
1
AN_1
0
AN_0
0
1
0
1
AN_0
0
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
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