Re: flex10k family

Ed Casas (edc@ece.ubc.ca) Sun, 17 Sep 2000 11:59:53 -0700 

Date: Sun, 17 Sep 2000 11:59:53 -0700
From: Ed Casas <edc@ece.ubc.ca>
Subject: Re: flex10k family



Alex Lau said:

> I think this is the case for all of us since EPF10KRC240-4 does
> not exist in the program which leads me to believe that it is a
> mistake in the lab instructions.

The -3 and -4 suffixes on the part numbers refer to the
propagation delay (in nanoseconds) through one of the FPGA's a
logic blocks.

As King Yung pointed out, the dialog boxes that display the
different devices have an option to show only the highest speed
parts for each devices (since faster parts are more expensive
Altera stands to make more money if you use one of these :).

Just uncheck the box and you'll see the other parts.  

Don't worry about this too much: the time between button pushes
of the "clock" button won't come anywhere close to the minimum
clock period of your device even if you synthesize for the -3
part and use a -4 part.  And I don't think the device programmer
actually checks the speed grade of the part it is programming.

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