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9.3 Sandbridge Technologies SB3010

Sandbridge Technologies has implemented a 3G multimedia handset design using their SB3010 base-band processor[16]. The processor integrates an ARM 9 RISC core, four of Sandbridge's own Sandblaster DSP cores, on-chip instruction caches and data memories and a programmable RF interface. In most broadband communication systems data is streamed from an A/D converter. To accommodate for this, their design uses scratchpad memories rather than data caches. Each Sandblaster core delivers 2 billion MAC operations per second and supports eight hardware threads. With a total performance of the order of 10 billion MACs per second, the SB3010 is able to run different wireless protocols such as WCDMA, as well as multimedia codecs such as MPEG-4 H.264 and MP-3.

The DSP architecture can be partitioned into an instruction fetch and branch unit, an integer and load store unit, and a SIMD vector unit. This SIMD unit consists of four vector processing elements (VPE), an accumulator register file, a shuffle unit, and a reduction unit. Integer operations 16, 32 and 40-bit fixed-point data types is supported. The Sandblaster DSP implements an unorthodox multi-threading method to avoid the hassles posed by data dependences and hazards in pipelined processors. Eight hardware threads are supported, but they issue instructions round-robin. Effectively, each thread issues an instruction every eighth cycle and its dependences resolve while it waits for other threads to take their turn.


next up previous contents
Next: 10 Stream Processor Based Up: 9 Current Solutions Previous: 9.2 Philips EVP   Contents
Binu K. Mathew, Ali Ibrahim