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March 31, 2008

IDT80KSW0004

Datasheet

5 Applications

Central switch based wireless processing

Figure 2 Application Overview

Note: The CPS-12 provides direct support for backplane connections using the serial RapidIO standard. The addition of an appropriate bridge (e.g.,

CPRI

↔ sRIO) allows for further backplane flexibility, accommodating designs based on a wide range of standards such as CPRI, OBSAI, GbE or

PCIe.

In a macro wireless station, a switch-based raw data combination and distribution architecture is widely adoped. Switch based architecture provides

high flexibility and high resource efficiency. The raw data from the Radio Unit is distributed to one or more processing cards by unicast or multicast.

Aggregating raw data from processing cards to a buffer-less chain can be done by a fast non-blocking swich.

Media Gateway and general processing

Note: The CPS-12 provides direct support for backplane connections using the serial RapidIO standard.

Though SAR and RTP is usually processed by NP/Processor, DSP is more efficient for TDM conversion and compression. A low jitter switch enables

the full utilization of DSP processing power. Priority support, fast switching, and multicasting will differentiate class of traffic to provide QoS.

6 Functional Overview

IDT’s CPS-12 is optimized for either board-level DSP/ASIC cluster applications or module-level distributed processing application. Up to 12 serial

RapidIO ports fully meet the standard V1.3 specification. The physical lanes may be configured to work at 3.125Gbps, 2.5Gbps or 1.25Gbps and in

short haul or long haul.

The CPS-12 switch has a sustained 30Gbps bandwidth. Also three major options exist within this category:

a.

Multicast: If a Multicast ID is received, the CPS-12 performs a multicast as defined by the device’s configurable sRIO multicast

mask registers. Also optional for broadcast.

b.

Unicast: All other operations are performed as specified in sRIO.

c.

Maintenance packets: As specified in sRIO.

The CPS-12 supports a “Store and Forward” and an optional “Cut Through” packet forward methodology. Refer to “CPS-12 User Manual” for details.

The CPS-12 can be programmed through a CPU or a DSP connected to one of the sRIO ports of the device or with a CPU connected to an I2C or

JTAG bus. It can also work along with a I2C configuration memory. This option is added to allow the CPS-12 to work in “remote stand alone” mode.

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