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Intelligent switch guides DSP clusters

Posted: 01 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Loring Wirbel? EE Times? Integrated Device Technology? preprocessing switch? 70K2000BR?

Integrated Device Technology Inc. (IDT) has developed a Serial RapidIO-based switch for controlling DSP clusters in cellular base stations. The 70K2000BR is being dubbed a "preprocessing switch," since it handles data formatting and summing for the TCI6482 Himalaya DSP. There are 40 individual bidirectional Serial RapidIO links on the chip, configurable in as many as 22 ports, in 1x or 4x configurations.

Each port can be configured to speeds of up to 3.125Gbps. The internal bandwidth of the switch is close to 100Gbps. Ports can be configured for short-haul chip-to-chip transmission or long-haul backplane applications, in speeds of 1.25-, 2.5- and 3.125Gbps.

While the biggest potential market is in 3G Node B base stations, the preprocessing switch (PPS) can also be used in the radio control network to allocate resources; and the core switching network for protocol and transcoding control.

Ron Jew, director of product management at IDT, said that logic for controlling DSP devices could be added to an FPGA or ASIC used in the control plane, but IDT claims the cost is reduced by adding the logic to the switching chip instead. The switch offloads the mundane tasks from core DSPs, allowing them to be dedicated to baseband signal-processing functions, and allocating resources in unicast, multicast or broadcast operations.

The switch has to control high-speed, static paths between the RF card and data path processors, as well as slower but bandwidth-adaptive paths across DSPs, and between DSPs and data path processors. By offloading such tasks as endian conversion, summation of packets, muxing packets and re-sequencing samples within packets, the PPS can cut cycle times of DSPs by as much as 20 percent.

IDT will offer demonstration AdvancedTCA boards that marry the PPS to four TI 6482 Himalaya processors, showing how the DSPs operate with a standard switching architecture and an intelligent switching architecture. The board allows users to assign a variety of traffic types and operations to the switch.

The switch, packaged in a 676-lead BGA that meets RoHS standards, is slated for production in November, when the chip will be priced at $125 each in quantities of 10,000.

- Loring Wirbel
EE Times

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