MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH ANALOG DEVICES VISUALDSP PLUSPLUS Instrukcja Użytkownika Pobierz pdf (Strona 21)

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20 DSP Selection Guide

SPA DSP Software Algorithms

SPA Code Modules

The table on the previous pages summarize the key

resources used by SPA’s most commonly used DSP

software code modules. Please contact SPA or refer to

the SPA web site (www.analog.com/spa) for a full set

of available algorithms. Apart from the addition of

new modules, SPA also continuously revises existing

implementations in order to further reduce MIPS and

memory figures.

Optimized Assembler Code

The algorithms presented have been implemented for

execution on the Analog Devices ADSP-218x series of

fixed-point DSPs and are currently being ported to the

new ADSP-219x series of fixed-point DSPs. The

code has been written in highly optimized assembler

code and is hand-crafted by experienced DSP engi-

neers in order to provide the lowest possible use of

DSP resources (MIPS, Program Memory and Data

Memory).

MIPS & Multiple Channels

It should be noted that SPA provides both peak and

average MIPS figures, as any MIPS budget should use

peak figures in order to choose a DSP of sufficient

resources. Most of SPA’s code modules have been writ-

ten to be multiple-instance capable. This means multi-

ple channels of the same function can be run on one

DSP. For example, six channels of G.729A can be exe-

cuted concurrently on an 80 MIPS ADSP-218xN DSP.

Program & Data Memory

Running multiple channels of the same algorithm on

the same DSP requires only one copy of the program,

thus keeping Program Memory (PM) usage low. Each

additional instance of the same algorithm also requires

less Data Memory (DM), due to re-use of common

tables and variables. This is referred to as DM+ in the

table overleaf. A similar concept applies to storage of

data in Program Memory for additional instances, and

is referred to as PM+ in the table.

Multiple Functions

Low MIPS and memory not only allows multiple

channels of the same module to be run on one DSP, it

also allows many different functions/modules to be

run on one DSP. For example, you could run G.723.1,

G.729A, G.726, G.168 and DTMF detection simulta-

neously on one 52 MIPS DSP.

Choice of DSPs

The table on the previous pages allows you to calculate

how many MIPS and how much memory will be

required by a given set of functions. Knowing these

figures, and allowing for any user specific shell or func-

tions, will enable you to select the most appropriate

DSP (of sufficient resources) from the ADSP-218x

product range. With the release of the new 160 MIPS

based ADSP-219x core comes an even higher channel

density capability per DSP. Added benefits of the high-

er MIPS DSPs include lower power consumption per

channel and lower board space per channel.

Standards Compliance & Code Quality

SPA code modules are compliant with international

standards such as the International Telecommunications

Union (ITU) and the voice coders are 100% bit compli-

ant with the ITU test vectors. SPA’s algorithms have

been extensively tested, are used by numerous compa-

nies world-wide and have proven interoperability. SPA

code modules have a common Application

Programming Interface (API) based on a memory

mapped interface scheme. Detailed specification sheets

are available for download from the SPA web site

(www.analog.com/spa). Other support documentation

includes developer’s guides and test reports.

Commercial Aspects

SPA can provide demonstration code for evaluation pur-

poses and has excellent customer support to assist with

selection and integration issues. Specialized customiza-

tion and consulting services are also available. SPA

provides flexible pricing and licensing arrangements.

The benefits of licensing SPA’s code, compared to in-

house development, include improved time-to-market,

experienced support, reduced risk, controlled cost and

the ability to allocate resources to other projects.

To Order - Contact SPA

Analog Devices - SPA Technology Centre

Analog Devices Australia Pty Ltd

Unit 3, 97 Lewis Road

Wantirna, Victoria, 3152, Australia

Tel: +61 3 9800 2000 Fax: +61 3 9800 2111

[email protected] www.analog.com/spa

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