By Jan Vanhoof, Karl Van Rompaey, Ivo Bolsens, Gert Goossens, Hugo De Man
High-Level Synthesis for Real-Time electronic sign Processing is a accomplished reference paintings for researchers and practising ASIC layout engineers. It makes a speciality of equipment for compiling advanced, low to medium throughput DSP procedure, and at the implementation of those equipment within the CATHEDRAL-II compiler.
The emergence of self sustaining silicon foundries, the diminished cost of silicon genuine property and the shortened processing turn-around time convey silicon expertise within sight of method homes. Even for low volumes, electronic platforms on application-specific built-in circuits (ASICs) have gotten an economically significant replacement for standard forums with analogue and electronic commodity chips.
ASICs hide the appliance zone the place inefficiencies inherent to general-purpose elements can't be tolerated. in spite of the fact that, full-custom hand made ASIC layout is usually no longer reasonable during this aggressive industry. lengthy layout occasions, a excessive improvement price for an extremely low construction quantity, the inability of silicon designers and the inability of applicable layout amenities are inherent problems to guide full-custom chip layout.
to beat those drawbacks, advanced structures must be built-in in ASICs a lot swifter and with no wasting an excessive amount of potency in silicon quarter and operation pace in comparison to hand made chips. the distance among approach 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 power to manufacture chips is certainly outrunning the power to layout them. At this second, CAD is one order of importance not on time. Conceptual CAD is the key-phrase to learning the layout complexity in ASIC layout and the subject of this e-book.
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Programmable resources are controlled by a control input, which is a field in the instruction word, supplied by the output of the global controller. ingle thread of control. All resources follow the same program flow, so only one program CHAPTER 2. 28 DSPARC~ECTURESYNTHES~ micro-code ROM reset logic R o M customised crossbar switch -g.. -1J-. 5: VlIW architecture with multi-branch controller. 3. DSP TARGET ARCHITECTURES 29 counter is maintained. U-II supports multi-way pf'OgNm jump.. Local decoding and local storage of instruction fields may reduce the width of the instruction word and the sile of the micro-program ROM.
The preprocessor can transform the source code into behavioural equivalents, to which the compiler attaches different implementation semantics. For the applicative paradigm, these transformations are relatively easy to automate. Deciding which transformations to execute is however far more difficult. Optimi,ing compiler, automatically transform the source code to improve the performance of the program execution or to improve the implementation efficiency. Most optimising compilers essentially eliminate flaws in the source code, which could have been avoided by careful programming.
In standard cell designs, constraints on power dissipation can therefore be translated into the limitation of a weighted sum of operator counts. However, the power lost in charging and discharging the interconnedions can only be estimated after the 1l00rplan has been generated. For complex module generators, power dissipation information of complete modules is even harder to get than gate delay figures, as these modules have many strudural parameters. It is virtually impossible to charaderise all instances of these modules in advance.