Design a mod-4 up/down counter (not a counter slice) with asynchronous active-low reset. Design a mod-4 up/down counter (not a counter slice) with both synchronous and asynchronous reset capabilities...

Design a mod-4 up/down counter (not a counter slice) with asynchronous active-low reset. Design a mod-4 up/down counter (not a counter slice) with both synchronous and asynchronous reset capabilities. 5.22. Design a 3-bit gray-code counter with both synchronous and asynchronous reset signals.