STMicroelectronics has developed an embeddable digital signal processor (DSP) core that can be implemented in versions that run at above 600 MHz or that consume less than 0,1 mW/MMAC (Million MAC) in a typical portable telecom application. Based on ST's ST100 DSP architecture that allows user-customised instruction sets, the company's ST122 Dual MAC core is supported by an evaluation chip and a complete development platform.
Available in the form of synthesizable IP, the ST122-DSP can be mapped into various versions ranging from ultra-low power to high-speed operation. This flexibility makes it suitable for a broad spectrum of applications including new generation mobile terminals, cellular infrastructure equipment, networking, broadband modems, voice-over-IP, data storage and mobile multimedia.
Like all ST100 architecture-based cores, the ST122 combines VLIW and RISC features to achieve the best balance between performance and code size. Flexible instruction modes allow a mixture of 16, 32 and 128-bit instructions and instruction sets can be customised to add applications-specific operators. Custom extensions have demonstrated an important performance boost in ADSL, GPRS/EDGE, audio and video algorithms while adding minimal silicon overhead. Custom instructions are controlled through the ST100's tightly coupled co-processor extension interface and are fully supported by the ST100 DSP toolchain.
To support the demanding performance needs the dual-MAC ST122 core can fetch four 32-bit instructions using 128-bit instruction mode and execute them in a single clock cycle. Highly efficient memory interfaces allow the connection of a large amount of flat data memory. The ST122 evaluation device includes 16 KB of L1 Program cache, 256 KB of L2-Program memory and 2x64 KB of data memory accessed at the DSP core's maximum clock speed.
Designed for easy and optimal integration into complex system-on-chip products, the ST122 is supported by a full range of peripherals.
For more information contact Simon Churches, Arrow Altech Distribution, 011 923 9600, [email protected]
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