By Tilman Glökler
After a quick creation to low-power VLSI layout, the layout house of ASIP guide set architectures (ISAs) is brought with a different concentrate on vital positive aspects for electronic sign processing. in line with the levels of freedom provided through this layout area, a constant ASIP layout movement is proposed: this layout circulate begins with a given program and makes use of incremental optimization of the ASIP undefined, of ASIP coprocessors and of the ASIP software program through the use of a top-down technique and by means of making use of application-specific variations on all degrees of layout hierarchy. A huge diversity of real-world sign processing purposes serves as motor vehicle to demonstrate every one layout selection and gives a hands-on method of ASIP layout. eventually, entire case experiences exhibit the feasibility and the potency of the proposed method and quantitatively evaluation the advantages of ASIPs in an commercial context.
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Additional resources for Design of energy-efficient application-specific set processors
However, instead of a structural processor description, the behavioral LISA description is used. Furthermore, speculative execution on an instruction set simulator together with user-deﬁned rules guarantee that meaningful test scenarios can be generated in a short amount of time. 7 Please refer to Chapter 6 for a description of the LISA tools suite. This page intentionally left blank Chapter 3 Efﬁcient Low-Power Hardware Design From a hardware perspective, an ASIP represents a complex ﬁnite state machine where the state transitions are triggered by the input data and the ASIP software.
On the other hand, more elaborate compression schemes result in typically signiﬁcant hardware effort and energy to decompress the code due to large look-up tables. 1, where application-speciﬁc instructions have been implemented to increase the number of parallel operations per instruction without a signiﬁcant impact on the overhead energy. 2 Register Transfer and Logic Level Low-power techniques on the register transfer (RTL) and on the logic level can be subdivided into techniques for lowering the capacitance and the switched voltage as well as into techniques to reduce the toggle rate of nodes with a high relative capacitance.
COSY , if the ASIP is intended for high level language programming support (a good ﬁt of the instruction set class results in a lower effort for compiler retargeting) For many of the above-mentioned parameters of the implementation the associated slack between constraint and parameter can be quantitatively evaluated. For a selected set of N important slack values that are subject to explicit optimization, it is useful to deﬁne a quantitative efﬁciency in order to compare architectural alternatives.