By Jan Vanhoof, Karl Van Rompaey, Ivo Bolsens, Gert Goossens, Hugo De Man
High-Level Synthesis for Real-Time electronic sign Processing is a entire reference paintings for researchers and practising ASIC layout engineers. It specializes in tools for compiling complicated, low to medium throughput DSP process, and at the implementation of those equipment within the CATHEDRAL-II compiler.
The emergence of self sustaining silicon foundries, the diminished fee of silicon actual property and the shortened processing turn-around time convey silicon know-how close by of approach homes. Even for low volumes, electronic platforms on application-specific built-in circuits (ASICs) have gotten an economically significant substitute for normal forums with analogue and electronic commodity chips.
ASICs hide the applying sector the place inefficiencies inherent to general-purpose elements can't be tolerated. although, full-custom hand made ASIC layout is usually no longer cheap during this aggressive industry. lengthy layout occasions, a excessive improvement price for an extremely low creation quantity, the inability of silicon designers and the shortcoming of perfect layout amenities are inherent problems to guide full-custom chip layout.
to beat those drawbacks, complicated structures need to be built-in in ASICs a lot quicker and with no wasting an excessive amount of potency in silicon sector and operation pace in comparison to hand made chips. the space among method layout and silicon layout can in simple terms be bridged through new layout (CAD). the assumption of a silicon compiler, translating a behavioural approach specification at once into silicon, was once born from the attention that the facility to manufacture chips is certainly outrunning the power to layout them. At this second, CAD is one order of value not on time. Conceptual CAD is the key-phrase to getting to know the layout complexity in ASIC layout and the subject of this publication.
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Code, but they are not mandatory. Instead, multi-rate semantics can be attached to other syntactical SILAG. constructs, such as conditional expressions and loops. 6), in order to perform rate control transformations manually. 3 DSP target architectures Many aspects of architecture synthesis are specific to the architectural style envisioned. AL-II target architecture in particular will be described. The physical details of the architecture will be abstracted up to the level the synthesis programs are working on.
L-n, the designer allocate, the type, that can be used by the compiler. Depending on the arithmetic complexity of the algorithm, the frame rate, the maximal chip area, the total power dissipation and on special constraints concerning I/O, the designer takes into account the module siles, the power dissipation, the versatility and the execution speed of the individual operators. 4. BUILDING A DSP SILICON COMPILER 45 factors. Memor;y management For descriptions with multidimensional data streams, efficient organiltJtion of the memory is crucial for the final design efficiency.
For instance, a delay line can be implemented in dual-port registers, in a FIFO or in a single-port RAM. The compiler is responsible for allocating and organising the memory efficiently, based on the lifetimes of all signal values. This can be done at compile time (see chapter 3). 5 Operations Signals are transformed by applying operations. Operations are represented by function call.. GII description must contain one main function. , no user-supplied definition is required. GII offers a number of primitive functions, such as the delay operator, particularly suited for describing DSP systems.