Next question: I wrote a simple program to display the value of a
register on 8 LEDs. At the same time, a 4-digit 7-segment display is
multiplexed to show some numbers.

Single module version: http://pastebin.com/mYv7HVfy This one works.
Everything works as expected.

Two module version: http://pastebin.com/BbXkrWBW This one doesn't work
and I don't know how to make it work. I tried to split the
functionality into two modules and now the functionality of the
7-segment multiplexer is lost. What went wrong here?

Also, what exactly are modules in Verilog?
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