homework help please. the assignment is to design a countdown timer that goes from 67 to 0 and back to 67. the output is two DCD_HEX displays. what i've done is divide the circuit into two parts, one for the ones digit (4 bits) and the other is for the tens digit (3-bits). i then used truth tables and karnaugh maps to design each sub-circuit. i need help designing a loadable counter because i want the ones digit display to start countdown from 7, but then proceed to loop normally (from 9 to 0). any links to online resources or direct help would be greatly appreciatred.