CPS-1432 Datasheet, PDF (27/79 Pages) Integrated Device Technology – 14-Port, 32-Lane, 160Gbps, Gen2 RapidIO Switch

CPS-1432 Datasheet
13. S-RIO Ports
Overview
The CPS-1432’s SerDes are in full compliance to the RapidIO AC specifications for the LP-Serial Physical Layer [5]. This section provides those
specifications for reference only; the user should see the specification for complete requirements.
Chapter 9 of the LP-Serial Physical Layer Specification, “1.25 Gbaud, 2.5 Gbaud, and 3.125 Gbaud LP-Serial Links” defines Level I links
compatible with the 1.3 version of the Physical Layer Specification, that supports throughput rates of 1.25, 2.5, and 3.125 Gbaud. Chapter 10 of
the specification, “5 Gbaud and 6.25 Gbaud LP-Serial Links” defines Level II links that support throughput rates of 5 and 6.25 Gbaud.
A Level I link should:
• Allow 1.25, 2.5, or 3.125 Gbaud rates
• Support AC coupling
• Support hot swap
• Support short run (SR) and long run (LR) links achieved with two transmitters
• Support single receiver specification that will accept signals from both the short run and long run transmitter specifications
• Achieve Bit Error Ratio of lower than 10^-12 per lane
A Level II link should:
• Allow 5 or 6.25 Gbaud baud rates
• Support AC coupling
• Support hot swap
• Support short run (SR), medium run (MR), and long run (LR) links achieved with two transmitters and two receivers
• Achieve Bit Error Ratio of lower than 10^-15 per lane
Together, these specifications allow for solutions ranging from simple chip-to-chip interconnect to board-to-board interconnect driving two
connectors across a backplane. The faster and wider electrical interfaces specified here are required to provide higher density and/or lower cost
interfaces.
The short run defines a transmitter and a receiver that should be used mainly for chip-to-chip connections on either the same printed circuit board
or across a single connector. This covers the case where connections are made to a mezzanine (daughter) card. The smaller swings of the short
run specification reduces the overall power used by the transceivers.
The long run defines a transmitter and receiver that use larger voltage swings and channel equalization that allows a user to drive signals across
two connectors and backplanes.
The two transmitter specifications allows for a medium run specification that also uses larger voltage swings that can drive signals across a
backplane but simplifies the receiver requirements to minimize power and complexity. This option has been included to allow the system integrator
to deploy links that take advantage of either channel materials and/or construction techniques that reduce channel loss to achieve lower power
systems.
The electrical specifications are based on loss, jitter, and channel cross-talk budgets and defines the characteristics required to communicate
between a transmitter and a receiver using nominally 100 Ohm differential copper signal traces on a printed circuit board. Rather than specifying
materials, channel components, or configurations, this specification focuses on effective channel characteristics. Therefore, a short length of
poorer material should be equivalent to a longer length of premium material. A 'length' is effectively defined in terms of its attenuation rather than
physical distance.
©2017 Integrated Device Technology, Inc.
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June 26, 2017