CPLDs are the most basic chips (right now) in programmable logic. You can make an AND, OR; make combinational gates, state machines and any combination of circuitry hardware that you want.
Its well suited to glue logic to get the cost of hardware production lower. I will explain a very basic introduction of CPLD and design flow to follow.
Finally i will leave you the JTAG interface schematic and some VHDL files for you to test. To view this entry go here.
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