XC9572XL breakout board: Frequency counter

Jason implemented a frequency counter on an XC9572XL CPLD. It uses a 1Mhz clock to count the duration of the input signal pulse, and shows the output on a 6 digit display.

Initially he had to use additional 7400 logic ICs to convert BCD output from the CPLD to the 7-segment displays. With some tweaking of VHDL code he was able to squeeze it into the CPLD as well.

Get your own XC9572XL based CPLD dev board for $15 and start experimenting with programmable logic today.

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