VHDL

Now, I used the state machine to apply to VHDL. In my case, there are
two states, S0 and S1.
When I press a button, S0 is transit to S1 such that the LED display
some of the segments,like segment a,b,c. And press this button again,
S1 is back to S0. How can I present in VHDL so that the LED display in
segment a,b,c ? Thanks!!

Why don't you have a look at a common VHDL book ?
There are so many simple examples which show
how to describe a state machine ...

You could design your state machine on a piece
of paper first,=20
later try to describe in VHDL ...

Rgds
Andr=E9

if you are trying to learn vhdl by asking simple questions to this group 
  you'll never learn.
Download a good tutorial from the web and start working with the 
provided examples.

Aurash

laura_pretty05@yahoo.com.hk wrote:
> Now, I used the state machine to apply to VHDL. In my case, there are
> two states, S0 and S1.
> When I press a button, S0 is transit to S1 such that the LED display
> some of the segments,like segment a,b,c. And press this button again,
> S1 is back to S0. How can I present in VHDL so that the LED display in
> segment a,b,c ? Thanks!!
> 

I want to know which VHDL book is better for learning...??

Hello,
   A good source of information is the tutorial EVITA 
(http://www.aldec.com/products/tutorials/) and 
(http://www.vhdl-online.de/tutorial/). Also, you can use the google to 
find others. I started using the book "VHDL starter's guide"

    Fabio

laura_pretty05@yahoo.com.hk wrote:
> I want to know which VHDL book is better for learning...??
> 

On 8 Mar 2006 10:31:12 -0800, laura_pretty05@yahoo.com.hk wrote:

>I want to know which VHDL book is better for learning...??

A good starting point is Peter Ashenden's "VHDL Cookbook".
You should be able to find it online for free download, using Google.

His bigger book "Designer's Guide to VHDL" is very good too.

- Brian

Brian Drummond wrote:


> A good starting point is Peter Ashenden's "VHDL Cookbook".

I disagree. It is a real nice book for advanced VHDL designers, but not 
for beginners. It shows a lot of not synthesizable code, a lot of 
features of the VHDL language (which may be confusing for a beginner), 
uses the data type bit / bit_vector which is not recommended and so on ...

For me Douglas J. Smith "HDL Chip Design" has of great help learning 
both VHDL and Verilog.

Ralf