Architecture Exploration for Embedded Processors with LISA by Andreas Hoffmann

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By Andreas Hoffmann

Already this present day greater than ninety% of all programmable processors are hired in embedded structures. This quantity is absolutely now not magnificent, considering that during a customary domestic you may locate one or desktops built with excessive­ of embedded structures, functionality usual processors, yet most likely dozens together with digital leisure, loved ones, and telecom units, every one of them outfitted with a number of embedded processors. additionally, the elec­ tronic parts of upper-class vehicles comprise simply over 100 professional­ cessors. therefore, effective embedded processor layout is definitely a space worthy taking a look at. The query arises why programmable processors are so renowned in embed­ ded procedure layout. the reply lies within the undeniable fact that they assist to slender the space among chip ability and fashion designer productiveness. Embedded processors cores are not anything yet one step additional in the direction of superior layout reuse, simply alongside the traces of normal cells in common sense synthesis and macrocells in RTL synthesis in past instances of IC layout. also, programmable processors allow emigrate performance from to software program, leading to an excellent superior reuse issue in addition to vastly elevated flexibility.

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PLUNGE is a graphical notation for specifying the pipeline structure. However, it is not clear if cycle-based simulators for pipelined architectures can be generated automatically from PLUNGE. As with Valen-C, the introduction of separate languages describing different views of the architecture (instructionset, behavior, structure) implies the problem of consistency. 2 Architecture-Centric Languages Architecture-centric languages try to derive instruction-set information, valid composition of hardware operations, latencies, and constraints from synthesis oriented machine descriptions.

Software Designer Platform When the architecture is fully specified by the hardware designers, a set of production quality software development tools is needed to enable the appli- 50 ARCHITECTURE EXPLORATION FOR EMBEDDED PROCESSORS cation designers to comfortably program the architecture. As in the traditional processor design flow the exploration tools are realized manually by the hardware designer, the tools need to be re-written for the application design phase. The reason for this is founded in the different areas of application of the tools.

2: Specification of the resource model in LISA. Resources reproduce properties of hardware structures which can be accessed exclusively by one operation at a time. However, an arrangement of hardware resources, such as registers grouped to a register bank or memories, usually does not allow concurrent access to all elements. Here, dedicated ports for read and write are provided. Introduced by the keyword PORT the declaration is enclosed in curly braces. The number of read and write accesses is specified as a logical conjunction using the operators OR and XOR where the number of reads is assigned to the keyword READ and the number of writes to the keyword WRITE.

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