TLK10081 Datasheet, PDF (9/62 Pages) Texas Instruments – 10Gbps 1-8 CHANNEL MULTI-RATE SERIAL LINK AGGREGATOR

TLK10081
www.ti.com
SLLSEE9 – NOVEMBER 2013
3 FUNCTIONAL DESCRIPTION
The TLK10081 allows for high-speed interleaving/de-interleaving of 1 to 8 serial data streams to aggregate
them into a single physical link. The data processing required to support this functionality is detailed in the
following subsections.
3.1 Transmit (Interleaving) Direction
Two configurations for TLK10081 transmit data path with the device configured to operate in the normal
transceiver (mission) mode are shown in Figure 3-1 and Figure 3-2.
In the transmit direction, the lower-rate serial lanes to be interleaved are first received by a deserializer
(one per lane) capable of resolving data at up to 5 Gbps. This deserialized data can be optionally aligned
to 10-bit word boundaries (based on a user-defined 10-bit alignment character) and optionally 8b/10b
decoded. If these functions are not relevant to the data being received, they can be bypassed. The
received data on each is input to a FIFO in order to compensate for phase differences between the low
speed serial links and the high speed side of the chip. This FIFO is also capable of clock tolerance
compensation if needed.
The high speed side can then aggregate the data in one of two ways – (1) word interleaving or (2) bit
interleaving. If word interleaving is chosen, the low speed data streams are interleaved in a round-robin
fashion 10 bits at a time. If bit interleaving is chosen, the interleaving is performed on a bit-by-bit basis. In
either case, provisions need to be taken so that the far-end receiver is able to correctly identify the lane
assignments. This is handled by the device’s lane ordering logic, described in Section 3.3.
The high-speed aggregate data stream can then be optionally 8b/10b encoded and optionally scrambled
by a polynomial scrambling function. These functions provide different ways of ensuring the high speed
serial output can be received properly by a device at the other end of the link (by increasing the transition
density and by giving a more even distribution of high and low levels). Note that if both the encoding and
scrambling functions are used, the user can determine whether to first encode the data and then scramble
or to first scramble the data and then encode. If the latter option is chosen, scrambling is not performed on
control codes (Kx.x). The resulting data is then output by a serializer capable of data rates up to 10 Gbps.
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FUNCTIONAL DESCRIPTION
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