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Oct, 2015

ROLE OF DIGITAL SIGNAL PROCESSING IN FPGA AND ASICs

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Importance of Digital Signal Processors:-

Digital Signal Processors are those microcomputers whose specifications are optimized for those applications which process high-speed numeric data­. When DSPs acts as digital filter, they receives digital values of signal samples and calculate results based on filter functions.

DSPs were proved outstanding in respect of time to market.

When we see in context of real time applications, DSPs were also proved excellent in context of performance.

DSPs were judged brilliant in terms of feature flexibility.

ASIC and FPGA:-

If we compare DSPs and FPGA, FPGAswere bestin context of time to market. FPGAs provide field-ready alterations to attain functionality. Their tractability is not as high as software programmable options, so they are less demanded than DSP in context of time to market. Although they are far better than ASSP in terms of cycle time and support.

ASICswere proved fair in context of time to market. ASICs were estimated exceptional in the matter of execution. For ASIC, if we consider a specific application, it is essential that ASIC must offer high execution. ASICs were considered good in context of price also. ASIC must be application oriented so there are less chances for cost efficiency; therefore ASICs offer good prices but price is good but somewhat behind Digital Signal Processing. If we talk about power than ASICs are best. Since ASICs are application oriented so it should consume less power. But as we know ASIC should be more optimized in respect of cost than power, so it is behind DSP

. ASSP was judged fair in the matter of development ease. This assumes that it will have some challenges achieving differentiated features that may slow down development somewhat. In terms of development help, ASSP is expected to have application-specific knowledge, but only the turnkey-oriented solution. Thus, they don’t have good development help. ASSP was judged poor in the matter of feature flexibility. ASSPs are by nature going to be somewhat poor in flexibility as they are inherently to their own specific application, and precisely to a unique solution approach to the targeted applications. These specifically focus and optimization is a tradeoff for flexibility.

Application-specific ICs can be tailored to perform specific functions extremely good, and can be improved to have quite good power efficiency. However, since ASICS are not particularly field-programmable and also their functionality cannot be iteratively changed or updated while in product development. As in every new update version of the product requires a redesign and trips through the foundry, expensive proposition, and impediment. The advanced programmable Digital Signal Processing devices, on the other hand, can be enhanced without making any change in the silicon, a small change in the software program, efficiently reducing development costs, and providing after market feature improvements with small code downloads. Consequently, it is more likable than nothing, when we consider ASICs design in the real time signal processing application they are typically employed as bus interfaces, glue logic, and/or functional accelerators for a programmable DSP-based system.

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