TLK2208B

The TLK2208B is the third generation of Gigabit Ethernet transceivers from Texas Instruments combining high port density and ultralow power in a small form-factor footprint. The TLK2208B provides for high-speed full-duplex point-to-point data transmissions based on the IEEE 802.3z 1000-Mbps Ethernet specification. The

TLK2208B supports data rates from 1.0 Gbps through 1.3 Gbps.

The primary application of this device is to provide building blocks for developing point-to-point baseband data transmission over controlled impedance media of 50 . The transmission media can be printed circuit board traces, copper cables or fiber-optical interface modules. The ultimate rate and distance of data transfer is dependent upon the attenuation characteristics of the media and the noise coupling to the environment.

The TLK2208B performs the data encoding, decoding, serialization, deserialization, clock extraction and clock tolerance compensation functions for a physical layer interface device. Each channel operates at up to 1.3 Gbps providing up to 8.32 Gbps of aggregate data bandwidth over copper or optical-media interfaces.

The TLK2208B supports two selectable reduced-pin-count double-data-rate (DDR) timing interfaces, nibble mode and multiplexed channel mode, to a protocol device. In the nibble interface mode, the parallel interface accepts nibble-wide unencoded or 8b/10b encoded data aligned to both the rising and falling edges of the transmit clock.

In the multiplexed channel mode, the parallel interface accepts 8-bit-wide unencoded or 10-bit-wide 8b/10b encoded data with channels A, C, E, and G aligned to the falling edge of the source synchronous transmit clock and channels B, D, F, and H aligned to the rising edge of the transmit clock. The receive path interface is done in the same manner.

The TLK2208B aligns the recovered data clock frequency to the reference clock on each channel by means of a clock tolerance compensation circuit and internal FIFO that inserts or drops 20-bit IDLE codes as needed in the interpacket gap (IPG). In synchronous mode, the received data for all channels is aligned to a single receive data clock that is a buffered version of the reference clock.

The TLK2208B supports a selectable IEEE 802.3z compliant 8b/10b encoder/decoder in all its modes of operation.

The TLK2208B automatically locks onto incoming data without the need to pre-lock.

The TLK2208B provides a comprehensive series of built-in tests for self-test purposes including loopback and PRBS generation and verification. An IEEE 1149.1 JTAG port is also supported to aid in board manufacturing testing.

The TLK2208B is housed in a small form-factor 19*19-mm, 289-terminal BGA with 1,0-mm ball pitch. The ball out and footprint are compatible with those of the PMC-Sierra PM8352 8-channel transceiver.

The TLK2208B is characterized to support the commercial temperature range of 0°C to 70°C.

The TLK2208B consumes 1.3 W when operating at nominal conditions.

The TLK2208B is designed to be hot-plug capable. A power-on reset puts the serial side output signal terminals

TX+/TX− in the high-impedance state during power up.