Evolution of implementation technologies

trend toward higher levels of integration

• Logic gates (1950s-60s)

• Regular structures for two-level logic (1960s-70s)

  • muxes and decoders, PLAs

• Programmable sum-of-products arrays (1970s-80s)

  • PLDs, complex PLDs

• Programmable gate arrays (1980s-90s)

  • densities high enough to permit entirely newclass of application, e.g., prototyping, emulation,acceleration

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