Re: lab problems

Ed Casas (edc@ece.ubc.ca) Sun, 17 Sep 2000 12:30:32 -0700 

Date: Sun, 17 Sep 2000 12:30:32 -0700
From: Ed Casas <edc@ece.ubc.ca>
Subject: Re: lab problems



> could someone please explain to me in detail what does the
> "behavior" part in the lab says? I'm totally lost.

It's a state machine.  The first paragraph defines the state
transitions and the required outputs in English.  The second
paragraph tells you that it is a synchronous Moore state machine.

If you're still lost (or even if you're not), follow the
step-by-step procedure given in the lecture notes for designing
state machines.

> and what does it mean when you get a eeror saying that: "WORK" does not 
> exist? I think it's talking about a library missing.

Well, sort of.  WORK is a library that VHDL uses to store
temporary files.  You'll get this message if the current
directory is undefined or is not writable. Typically this
happens because you haven't defined the project (follow the
instructions carefully) but it can also happen if the project
directory is on a CD, or on a floppy disk or hard disk with
insufficient space, etc.

> and how do you tell the counter after it moved to the next
> count to also show the next number on the 7-seg.

The segments on the display are the state machine outputs so this
is just part of the design of the state machine.  Follow the
steps given in the notes.

-- 
Ed Casas   edc@ece.ubc.ca   http://casas.ece.ubc.ca   +1 604 822-2592