4 Device Description
The CPS-10Q is optimized for cost-effective high performance RapidIO switching, typically used in embedded applications. Typical applications
include backplane switching and intensive signal processing where the switch is key to switching on the data path. These applications include wireless
infrastructure base station and RNCs, radar and sonar, and medical imaging. It can serve equally as backplane or linecard switch, supporting up to 16
ports. It is an end-point free (switch) device in an sRIO network.
The CPS-10Q receives packets from up to 16 ports. The device offers full support for normal switching as well as enhanced functions:
1) Normal Switching: All packets are switched in accordance with standard serial RapidIO specifications, with packet destination IDs determining
how the packet is routed.
Three major options exist within this category:
a. Multicast: If a Multicast ID is received, the CPS-10Q performs a multicast as defined in the sRIO multicast registers.
b. Unicast: specified by sRIO.
c. Maintenance packets: As specified by sRIO.
The CPS-10Q supports a peak throughput of 100 Gbps which is the line rate for 10 ports in 4x configuration, each at 10 Gbps (3.125 Gbps minus the
sRIO-defined 8b/10b encoding), and switches dynamically in accordance with the packet headers and priorities.
2) Enhanced functions
Enhanced features are provided for support of system debug. These features which are optional for the user consist of two major functions:
a. Packet Trace: The Packet Trace feature provides at-speed checking of the first 160 bits (header plus a portion of any payload) of every incom-
ing packet against user-defined comparison register values. The trace feature is available on all serial RapidIO ports, each acting indepen-
dently from one another. If the trace feature is enabled for a given port, every incoming packet is checked for a match against up to 4
comparison registers. In the event of a match, either of two possible user defined actions may take place:
i) not only does the packet route normally through the switch to its appropriate destination port, but this same packet is replicated and sent to
a “trace port.” The trace port itself may be any of the standard serial RapidIO ports. The port used for the trace port is defined by the user
through simple register configuration.
ii) the packet is dropped.
If there is no match, the packets route normally through the switch with no action taken.
The Packet Trace feature can be used during system bring-up and prototyping to identify particular packet types of interest to the user. It might
be used in security applications, where packets must be checked for either correct or incorrect tags in either of the header or payload. Identi-
fied (match) packets are then routed to the trace port for receipt by a host processor, which can perform an intervention at the software level.
b. Port Loopback: The CPS-10Q offers internal loopback for each port that may be used for system debug of the high speed sRIO ports. By
enabling loopback on a given port, packets sent to the port’s receiver are immediately looped back at the physical layer to the transmitter -
bypassing the higher logical or transport layers.
c. Broadcast: Each multicast mask can be configured so that the source port is included among the destination ports of that multicast operation.
The CPS-10Q can be programmed through any one or combination of sRIO, I2C, or JTAG. Note that any sRIO port may be used for programming.
The device can also configure itself on power-up by reading directly from ROM over I2C in master mode.
2010 Integrated Device Technology, Inc. All rights reserved.
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January 18, 2011