I made the simple function tester to confirm the CPLD operation.


The above is the operation confirmation situation of the 5 Binary Counter.

The confirmation of the operation of CPLD is complicated.
This tester can make the ON/OFF condition for the input, the input of the clock pulse and the confirmation of the output level.
Consumption electric power is suppressed by using high brightness LED.
The current when lighting up all LEDs including the 7 segment LED was about 70 mA.

Functions of the tester are shown below.

Function	Quantity	Remarks
DIP switch	12	ON : L level, OFF : H level
Square wave oscillator	1	1-Hz square wave
BCD switch	1	ON bit : L level, OFF bit : open
LED	10	Each LED lights up by the H level
7 segment LED	1	Each segment lights up by the L level

Circuit drawing Pattern drawing Circuit explanation Parts explanation

The examined state which connects with the CPLD programmer.