PM9313 datasheet(79/343 Pages) PMC

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PM9311/2/3/5 ETT1™ CHIP SET

PMC-2000164

ISSUE 3

ENHANCED TT1™ SWITCH FABRIC

Released

Data Sheet

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

PMC-Sierra, Inc.

1.6.5

LCS PHY Layer

The LCS PHY provides a high-speed parallel transfer of data in the form of framed, fixed-sized segments

that have been channelized across multiple media connections. Higher segment rates are also supported

through trunking options, while lower segment rates are supported through multiplexing options.

The channelization, framing, and transmission functions of the LCS PHY have been specified to allow use

of a variety of available Serdes (serialization/deserialization) and parallel fiber optics components. Portions

of this specification will refer to examples of media types. The LCS PHY specification does not preclude

other compatible options.

Channelization requirements include the mapping of segments to multiple channelized frames, channel

skew specifications, and interchannel (segment) alignment operation.

Frame alignment, encapsulation, retiming and the required code-points for a parallel, full-duplex interface

are included in the framing function.

Transmission requirements include the clocking requirements and electrical characteristics of the parallel

interface.

The parallel interface used by the LCS PHY is based on widely available Serdes implementations that

include their own endec (encoder/decoder) functionality. These components also fit well with the available

and emerging parallel fiber optics components. Optionally, an LCS device can include the Serdes and

8B/10B Endec functions, but these are not strictly required by the LCS specification. In fact, LCS

implementations that forego the use of optical transceivers or Serdes and endecs altogether for single

board design are also compliant with the LCS specification.

1.6.5.1

Link Speed

The LCS PHY for ETT1 supports one in link speed option, 1.5 Gbaud. This link speed has various

requirements that affect channelization and framing functions, discussed here and in the LCS

specification. Serdes and optical transceiver components are available to support the 1.5 Gbaud links.

1.6.5.2

Segment Payload Options

The LCS Protocol for ETT1 uses an eight byte prepend and supports two segment payload sizes, a

64-byte payload with an eight byte LCS prepend (8+64 byte segment) and a 76-byte payload with an eight

byte LCS prepend (8+76 byte segment). Discussion of these options is also covered in the channelization

and framing sections here and in the LCS specification.

1.6.5.3

Segment Channelization

The LCS Physical Layer includes the external interface for receiving and transmitting LCS segments from

and to the linecard. The interface consists of parallel “ganged” interfaces that each carry a serialized

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