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XC9572XL breakout board: Frequency counter

Posted on Wednesday, November 2nd, 2011 in CPLD by DP

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.

Via the forum

This entry was posted on Wednesday, November 2nd, 2011 at 11:00 am and is filed under CPLD. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

2 Responses to “XC9572XL breakout board: Frequency counter”

  1. Sjaak says:

    Nice display, real vintage ;)

  2. ChrisW says:

    CPLD/FPGA development contest?

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