Re: More basic questions about Spartan 2 IOB

On a sunny day (Sat, 15 Nov 2003 18:32:18 -0000) it happened
[EMAIL PROTECTED] (Hal Murray) wrote in
<[EMAIL PROTECTED]>:
>
>>So what are the exact commands for the UCF file to:
>>Switch off / on the input register.
>>Select a pos or neg clock for the input and output registers.
>>What are the defaults?
>
>The usual approach is that your code or schematics makes the registers
>and tri-state buffer, and then you place them in the IOB (if that's
>where you want them).
OK, I see, so it is more a matter of to pick a setup, and then force it
to be in the IOB...
Somehow I got confused about this.... thought IOB was perhaps a complete
block with all those control / clock lines as input...
If not then, if you place it in the IOB or not, only has influence on routing
and thus speed?


>There are probably convenient library elements that may help you
>easily get what you want.  You probably want to find the library
>documentation anyway - lots of good ideas in there, especially
>for the details like you are asking about.
I will go over all docs again until any confusion is gone.
Thank you (all) for the help so far.