In the block diagram, the encryption unit has inputs (prs, rst, hex), and
the decryption unit only has input (hex). This is not correct. since the
decryption unit must also count key presses, it should have inputs of prs
and rst also, so that it can keep in sync with the encryption unit.
Also, the LED output units have an inputs of 4 bits. however, the
encrypted output is 8 bits. here is how things should match up:
encrypter output: 8 bit
encrypted output unit: input 8 bits (from encrypter)
encrypted output unit: output 16 bits (to 2 xstends leds)
decrypter input: 8 bits (from encrypter)
decrypted output unit: input 4 bits (hex digit)
decrypted output unit: output 8 bits (to xs40 led)
I will try to produce a new diagram tonight.
sorry about this :(
"Oh, there it is...
...Then what the heck was that other piece of code we changed?"
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