I've created a circuit that gets a 3-bit code and changes it to either from binary to gray code (if c is low) or from gray code to binary (if c is high):
now for the question with the 7 bit, this is what I came up with (the F component is the circuit from before), I wanted to know if I'm right in my thinking or if I might miss something:
Try to create separate 7-bit Gray to binary and binary to Gray converters first (or start with 4-bit convertors to make it simple). Look at the similarities between the two, and it should be obvious where you would add the MUXs.
If you look at your own logic block, it's easy to see that it only has four inputs and one output.
So just make a module out of the red-circled portion, like this:
I'll call it GB for now.
Then the 7-bit converter would look like:
Except that the highest order GB can be replaced with a simple XOR, since it's G input doesn't connect to a higher-order bit's stage and the C input can be ignored since it selects the same thing either way:
You were just on the verge of getting there, I suspect.
I haven't tested this as I trust you already did good work before. But it looks correct to me. That said, you shouldn't trust what I write. Verify it.
