TLK111 datasheet(34/110 Pages) TI1

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TLK111

SLLSEF8B – AUGUST 2013 – REVISED JANUARY 2014

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5.3.4

Jabber Function

Jabber is a condition in which a station transmits for a period of time longer than the maximum permissible

packet length, usually due to a fault condition. The jabber function monitors the TLK111 output and

disables the transmitter if it attempts to transmit a packet of longer than legal size. A jabber timer monitors

the transmitter and disables the transmission if the transmitter is active for approximately 100ms.

When disabled by the Jabber function, the transmitter stays disabled for the entire time that the ENDEC

module's internal transmit enable is asserted. This signal must be de-asserted for approximately 500ms

(the unjab time) before the Jabber function re-enables the transmit outputs.

The Jabber function is only available and active in 10Base-T mode.

5.3.5

Automatic Link Polarity Detection and Correction

Swapping the wires within the twisted pair causes polarity errors. Wrong polarity affects the 10B-T PHYs.

The 100B-TX is immune to polarity problems because it uses MLT3 encoding. The 10B-T automatically

detects reversed polarity according to the received link pulses or data.

5.3.6

10Base-T Transmit and Receive Filtering

External 10Base-T filters are not required when using the TLK111, because the required signal

conditioning is integrated into the device. Only isolation transformers and impedance matching resistors

are required for the 10Base-T transmit and receive interface. The internal transmit filtering ensures that all

the harmonics in the transmit signal are attenuated by at least 30dB.

5.3.7

10Base-T Operational Modes

The TLK111 has two basic 10Base-T operational modes:

•

Half Duplex mode – In Half Duplex mode the TLK111 functions as a standard IEEE 802.3 10Base-T

transceiver supporting the CSMA/CD protocol.

•

Full Duplex mode – In Full Duplex mode the TLK111 is capable of simultaneously transmitting and

receiving without asserting the collision signal. The TLK111 10Mbs ENDEC is designed to encode and

decode simultaneously.

5.4

Auto Negotiation

The auto-negotiation function, described in detail in IEEE802.3 chapter 28, provides the means to

exchange information between two devices and automatically configure both of them to take maximum

advantage of their abilities.

5.4.1

Operation

Auto negotiation uses the 10B-T link pulses to encapsulate the transmitted data in a sequence of pulses,

also referred to as a Fast Link Pulses (FLP) burst. The FLP Burst consists of a series of closely spaced

10B-T link integrity test pulses that form an alternating clock/data sequence. Extraction of the data bits

from the FLP Burst yields a Link Code Word that identifies the operational modes supported by the remote

device, as well as some information used for the auto negotiation function’s handshake mechanism.

The information exchanged between the devices during the auto-negotiation process consists of the

devices' abilities such as duplex support and speed. This information allows higher levels of the network

(MAC) to send to the other link partner vendor-specific data (via the Next Page mechanism, see below),

and provides the mechanism for both parties to agree on the highest performance mode of operation.

Architecture

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