Design a 1 minute clock, counting from 00 to 59 seconds and then starting back at 00 again (note that you need 2 digits, which will be referred to as the 10-seconds digit and the 1-second digit). The 555 timer will supply the clock pulse for the 1-second digit. You need to design a method to reset that counter (note that the seconds should count from 0 to 9 and then back to 0 again). When the 1-second digit transitions from 9 to 0, you must find a way to clock the 10-seconds digit. Also note that the 10-seconds digit should count from 0 to 5, then return to 0. Create a way to set your clock to 00 (and hold it at 00) using an input from a dipswitch. Other than these requirements, the design for the combinational circuit is left completely up to you. Use whatever devices you want.

Output the numbers from your counters to 2 7-segment displays. You may use 74LS47 BCD to 7-segment display decoders to convert the output of your counter to the displays. The 74LS47 has open collector outputs so you will not need a resistor from the output of the 74LS47 to the input of the 7-segment display. Use a resistor on your common inputs to 5V in order to control the intensity of the light (you may burn out your 7 segment displays if you dont include these resistors). Simulate your clock using LogicWorks.

What I am really interested in is the logic works simulation needed to implement the circuit because I can't seem to get it to work.