cs--dsp c extension to c

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Presented by : Bijay Kumar Tripathy CS200117244

THE DSP-C EXTENSION TO C

Technical Seminar Report On


under the guidance of

Mr. R.K. Shial

submitted by

Bijay Kumar Tripathy CS200117244


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Introduction

DSP-C offers DSP developers the opportunity to write

their application in a portable manner. DSP-C is a

language extension to C that provides the programmer

with direct access to performance enhancing features in

DSP processors.


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The Glory of DSP-C Emulation

DSP-C emulation allows you to develop, test and debug the

DSP application algorithms on your PC or workstation without

having access to the actual processor.

DSP-C emulation simplifies the design flow significantly,reducing both the headaches associated with maintaining two

sets of code.

It also increases market opportunity by reducing developmenttime.


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Typical DSP Architecture


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DSP processors have a highly specialized architecture toachieve the performance requirements for signal processingapplications within the limits of cost and power consumptionset for consumer applications.

Unlike a conventional Load-Store (RISC) architecture, DSPprocessors have a data path with memory access units.

A further specialization of the data path is the coupling of

multiplication and addition to form a single cycle multiply-Accumulate MAC unit


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DSP-C FEATURES

Arithmetic Features

Multiple Memories

Circular Buffers

Portability Implementation


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ArithmeticFeatures

The fixed Type :-The fixed type offers fixed point

arithmetic in the range of [-1.0, +1.0> (-1.0 included but

not +1.0).

The accum Type :-The accum is also a fixed point type

and can also be qualified with short and long.

The sat Qualifier:- It makes that all operations withoperands of sat qualified type are saturated.


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The unsigned Qualifier :-The unsigned qualifier can

also be applied to the fixed point types.

Arithmetic Operations :-The arithmetic operations forfixed and accum include all those defined for the int type,

but exclude , ~, &, | and ^.


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Portability

By design, a DSP-C implementation is adapted to the

processor for which it is implemented.

The portability of DSP-C programs is not alwaysguaranteed.

As not all processors are equal, not all DSP-C

implementations can be equal.


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Multiple Memories

Multiple memory access is implemented as type

qualifiers.

There are no predefined keywords for this, as the actual

memory segmentation is left to the implementation.

As an example, assume that X is a memory qualifier.

The definition:

__X int a[25] ;

Means that a is an array of 25 integers which is locatedin the X memory.


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Implementation

DSP-C should consider providing a specification of how

the language features are best used to achieve the

highest performance.

The implementation might also consider that some parts

of DSP-C cannot be implemented at all without

significant performance overheads.


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THE FUTURE OF DSP-C

Embedded C :-

Embedded C differs from DSP-C on

details, but it fully subscribes to its design rationale. It

bridges the gap between the signal processing

application, plain C, and signal processing hardware,

instead of introducing abstract notions that have no

counterpart in the processor. Embedded C is important

because it guarantees portability of important common

performance enhancing features of DSP processors


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CONCLUSION

DSP-C is a relatively small extension to the C language,

but its impact on the programmability of DSP processors

is enormous. Specialized high performance features are

the reasons why DSP processors exist. The DSP-C

approach will become the standard solution for high levellanguage programming of the many billions of DSP

processors out in the field.


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THANK YOU!!!

cs--dsp c extension to c

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