Digital systems design with FPGAs and CPLDs by Ian Grout

By Ian Grout

This textbook explains how one can layout and boost electronic digital structures utilizing programmable good judgment units (PLDs). absolutely functional in nature, the booklet good points quite a few (quantify whilst recognized) case research designs utilizing numerous box Programmable Gate Array (FPGA) and intricate Programmable good judgment units (CPLD), for more than a few purposes from keep an eye on and instrumentation to semiconductor automated test Read more...

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Extra info for Digital systems design with FPGAs and CPLDs

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This then led to the use of PLDs for prototyping digital ASIC designs, allowing for real hardware emulation of the ASIC prior to fabricating the ASIC itself. This was useful for design verification and design debugging purposes, but with the early PLDs, the limited speed of operation and size limitations meant that the PLD-based hardware emulation of the ASIC was physically large and slower than the resulting ASIC. Hence, it was not always possible to test the operation of the ASIC hardware emulator at the intended speed of operation of the ASIC.

Structured ASICs are similar to the mask programmable gate array in that they have customisable metal interconnect layers patterned on top of a prefabricated base. Either standard logic gates or look-up tables (LUTs) are fabricated in a 2-dimensional array that forms the underlying pattern of logic gates, memory, processors and IP blocks. This base is programmed using a small number of metal masks. The purpose of this is to reduce the non-recurring engineering (NRE) costs when compared to a standard cell ASIC approach and to bridge the gap that exists between the standard cell ASIC and FPGA where: 1.

14). This architecture is simpler than the PLA and removes the time delays associated with the programmable OR gate plane interconnect, hence producing a faster design. However, this comes at a cost of flexibility—the PALÒ is less flexible in the ways in which a digital logic design can be implemented than the PLA. 14: PALÒ architecture The PLA and PALÒ architectures as shown allow combinational logic designs to be implemented. If the design provides for feedback of the outputs to the inputs, then it is possible to implement latches and bistables, thereby also allowing sequential logic circuits to be implemented.

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