I just know there are two files to be made. One deign and the other one for test.

Question:

Non-retum-to-zero inverted (NRZI) is a data coding scheme used to comminicate with universal serial bus (USB) devices. The output signal (z) of an NRZI generator transitions when the input bit (x) is 0 and remains at the constant previous value (0 or 1) when the input bit is 1. That is, from right to left, when the input to the NRZI generator is 0 0 000 0, its output from right to left will transition as 1 010 10. Its output for consecutive 1's at the input, however, will remain at the previous output value. For example, the NRZI generator outputs from right to left z: 00 00010111101011 for input X111100011100 001 1 read from right to left. Likewise, for X 0xCFOC, Z: 0xEFAE. Design the NRZI generator. (Hint: design a Mealy FSM)