TLK105_16 Datasheet, PDF (10/104 Pages) Texas Instruments – TLK105 TLK106 Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK105
TLK106
SLLSEB8C – AUGUST 2012 – REVISED APRIL 2016
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3.3 IO Pins Hi-Z State During Reset
The following IO or output pins are in hi-Z state when RESET is active (Low).
PIN NAME
TXD_3
TX_EN
INT/PWDN
LED_LINK
MDIO
RX_DV
CRS
RX_ER
TYPE
IO
IO
IO
IO
IO
IO
IO
IO
INTERNAL
PU/PD
PD
PD
PU
PU
PD
PU
PU
PIN NAME
COL
RXD_0
RXD_1
RXD_2
RXD_3
TX_CLK
RX_CLK
TYPE
IO
IO
IO
IO
IO
O
O
Internal
PU/PD
PU
PD
PD
PD
PD
3.4 Auto-Negotiation
The TLK10x device auto-negotiates to operate in 10Base-T or 100Base-TX. With Auto-Negotiation
enabled, the TLK10x negotiates with the link partner to determine the speed and duplex mode. If the link
partner cannot Auto-Negotiate, the TLK10x device enters parallel-detect mode to determine the speed of
the link partner. Parallel-detect mode uses fixed half-duplex mode.
The TLK10x 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. Control the Auto-Negotiation function within the TLK10x by
internal register access according to the IEEE specification.
Alternatively, control the HD-FD functionality by configuring the AN_0 pins. The state of AN_0 selects full
or half duplex mode, both in Auto-negotiation or force 100/10 mode as given in Table 3-2. The state of
AN_0 upon power-up/reset, determines the state of bits [8:5] of the ANAR register (0x04h).
Auto-Negotiation advertises ANEN, 100BT by default. Full-Duplex or Half-Duplex configuration is available
through the AN_0 bit. Internal register access configures the device for a specific mode.
Table 3-2. Auto-Negotiation Modes
AN_0
0
1
FORCED MODE
10Base-T, Half-Duplex
100Base-TX, Half-Duplex
10Base-T, Half or Full-Duplex
100Base-TX, Half or Full-Duplex
Internal register access controls the Auto-Negotiation function, as defined by the IEEE 802.3u
specification. For further detail regarding Auto-Negotiation, see Clause 28 of the IEEE 802.3u
specification.
3.5 Auto-MDIX
The TLK10x device automatically determines whether or not it needs to cross over between pairs,
eliminating the requirement for an external crossover cable. If the TLK10x interoperates with a device that
implements MDI/MDIX crossover, a random algorithm as described in IEEE 802.3 determines which
device performs the crossover.
Auto-MDIX is enabled by default and can be configured via pin strap, control register CR1 (0x09h), bit 14
or via register PHYCR (0x19h), bit 15.
The crossover can be manually forced through bit 14 of the PHYCR (0x19h) register. Neither Auto-
Negotiation nor Auto-MDIX is required to be enabled in forcing crossover of the MDI pairs.
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Hardware Configuration
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