[time-nuts] CPLDs for clock dividers

[Bob Camp]

Hi

All of these packages have a *lot* of crazy optimizations you can do. The defaults work pretty well in Quartus with one exception.

They are in the process of moving from their "classic timing analyzer" to another timing analyzer (TimeQuest?). Right now the classic analyzer is disabled by default, but it still sets it's self up ok for simple stuff. By default you will get error messages about "timing driven synthesis" unless you do a timing constraints file. If you just go to the timing analyzer section and flip over to the classic analyzer,  the messages will go away. You can go back and fiddle with timing files after you have the basic design in and running.

The other alternative is of course to do the timing file first and then put in the design. Nothing wrong with that, if its the work flow you prefer.

Bob

On Feb 4, 2010, at 11:12 PM, paul swed wrote:

> I used the link and the file downloaded reasonably
> Install tomorrow
> Thanks
> 
> On Thu, Feb 4, 2010 at 8:31 PM, Luis Cupido <cupido at mail.ua.pt> wrote:
> 
>> You may try Altera. Quatus web 9.1 is 1.5Gb and painless to setup.
>> 
>> https://www.altera.com/support/software/download/altera_design/quartus_we/dnl-quartus_we.jsp
>> 
>> lc.
>> ct1dmk.
>> 
>> 
>> paul swed wrote:
>> 
>>> I also did the web install and need to go back and add more options.
>>> How painful. Enough to drive me away from this project
>>> 
>>> On Thu, Feb 4, 2010 at 6:26 PM, Gerhard Hoffmann <dk4xp at arcor.de> wrote:
>>> 
>>> paul swed wrote:
>>>> 
>>>> Well not having a lot of luck with the xilinx wise application.
>>>>> Its a 6.5 GB tar and after a good 5 hr plus download the tar doesn't
>>>>> open
>>>>> with zipgenious
>>>>> But 6.5 GB to work a cpld. Seems crazy to me.
>>>>> 
>>>>> 
>>>>> I also had no luck two weeks ago with the single file download.
>>>> The web install worked ok, however. It downloads many smaller
>>>> files. I think my very slow DSL connection is to blame here.  :-(
>>>> 
>>>> Two years ago, when I still lived in Berlin, Xilinx used to have one of
>>>> the
>>>> few servers that were capable to max out my (then) 16 MBit/s link.
>>>> 
>>>> 
>>>> @ Ulrich:
>>>> Did you see a show stopper with the Xilinx Coolrunners?
>>>> I have used them before and liked them. Really fast and they
>>>> consume close to no power. I'd like to deploy them for something
>>>> jitter-critical very soon.
>>>> 
>>>> regards, Gerhard dk4xp
>>>> 
>>>> 
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