![]() ![]() The CPLDs has predictable timing characteristics hence are suitable for critical control applications and other applications where a high performance level is required. The complexity of a typical PAL device is around few hundred logic gates whereas the complexity of CPLD is around tens of thousands of logic gates. This shows that, some of the connections between function block outputs and inputs are not supported in the CPLD. Further, switch matrix in a CPLD may or may not be fully connected. A switch matrix is used for function blocks to function blocks interconnections. The function blocks has programmable interconnections. Figure below shows the typical CPLD architecture having four function blocks of PLDs. ![]() CPLD contains the circuitry similar to PAL devices. A complex programmable logic device (CPLD), is a complex device than programmable logic devices discussed in previous sections.
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