By Francky Catthoor, Sven Wuytack, G.E. de Greef, Florin Banica, Lode Nachtergaele, Arnout Vandecappelle

The major purpose of this publication is to offer an influence of the cutting-edge in system-level reminiscence administration (data move and garage) comparable matters for complicated data-dominated real-time sign and knowledge processing purposes. the fabric relies on learn at IMEC during this quarter within the interval 1989- 1997. as a way to care for the stringent timing necessities and the knowledge ruled features of this area, we've got followed a aim structure type and a scientific method to make the exploration and optimization of such platforms possible. Our method can be very seriously program­ pushed that's illustrated by means of a number of sensible demonstrators, in part used as red-thread examples within the ebook. furthermore, the publication addresses simply the stairs above the conventional high-level synthesis (scheduling and allocation) or compilation (traditional or ILP orientated) initiatives. The latter are almost always focussed on scalar or scalar flow operations and knowledge the place the inner constitution of the complicated information kinds isn't exploited, unlike the methods mentioned right here. The proposed methodologies are principally autonomous of the extent of programmability within the data-path and controller in order that they are worthwhile for the realisation of either and software program platforms. Our aim area involves sign and information processing structures which care for quite a lot of data.

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3. Use of a hierarchical memory organisation where the smaller memories (with reduced accessed the most and the larger ones are accessed the least. Claad) are 4. Avoidance of the use of multi-port memories if I-port alternatives with a reasonable cost can be used instead, because more area but also more interconnect (and hence energy-delay) is required for these multi-port components. Also the energy per memory access is significantly increased. These principles can be enabled by applying an appropriate system design methodology.

It is however limited to the SIMD context and only takes into account the minimisation of the cycle cost. Moreover, it does not support data-dependent access. The recent work at Ecole des Mines de Paris [IS] on data mapping is closer already to what is desired for multi-media applications. It tries to derive a good memory allocation in addition to the partitioning of operations over a distributed memory MIMD processor. It does not support optimisations inside 20 CUSTOM MEMORY MANAGEMENT METHODOLOGY the processor memory however, so the possibility to map signals in-place on top of one another in the memory space is not explored yet and every processor has a single memory.

Later on extensions and improvements have been proposed for scheduling based on cyclo-static models [364], list scheduling including loop folding [165], pipeline interleaving [231], pipelined multi-processors [211], and the combination of scheduling and transformations [424, 423]. An evaluation of several scheduling approaches has been described in [186]. In addition, instruction-level parallelism (ILP) has become a major issue in the RISC compiler community. Examples of this can be found in the ILP workshop embedded in Europar'96 [150].

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Custom Memory Management Methodology: Exploration of Memory by Francky Catthoor, Sven Wuytack, G.E. de Greef, Florin
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