Re: CIAs and PLA in a CPLD?

From: Mark McDougall <>
Date: Mon, 03 Sep 2012 09:26:00 +1000
Message-ID: <>
On 2/09/2012 10:25 PM, wrote:

> For example:  with a CASE  xx OF  .... END CASE; .. a WHEN OTHERS is
> required for lattice / xylinx, not for quartus (I still don’t know what
> is correct or not) (still learning..)

Not strictly correct. It depends on which libraries you're using, what the 
data type you're using for the CASE statement, and of course, which cases 
your statements cover! In general, for Quartus using 'modern' libraries and 
std_logic, you will require WHEN OTHERS as there are many different values 
for a std_logic_vector - not only '0' & '1'. In any case, it's good practice 
to include one anyway.


|              Mark McDougall                | "Electrical Engineers do it
|  <>   |   with less resistance!"

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Received on 2012-09-03 00:00:05

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