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olliie
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olliie
Posts: 4
Registered: ‎03-08-2012
0

select io wizard 3.3 and spartan 6

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‎03-29-2012 02:45 AM

I have create an LVDS interface with the coregen wizard

The problem I've had is that it creates a IBUFGDS_DIFF_OUT component for the incomming clock.

With ISE 13.4 this is completely unplaceable anywhere.

 

I've changed it to a IBUFDS_DIFF_OUT and now i get through PAR.

 

My question is will this affect the timing of this interface? and is this the right thing to do.

 

Also can you fix either the wizard or ISE ?

 

Cheers

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eteam00
Posts: 7,505
Registered: ‎07-21-2009
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Re: select io wizard 3.3 and spartan 6

[ Edited ]
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‎03-29-2012 03:03 AM - edited ‎03-29-2012 03:03 AM

Please describe what you are trying to design.  Perhaps the SelectIO wizard is not the best solution, or perhaps the selection options in the wizard are not sufficiently clear.

 

-- Bob Elkind

SIGNATURE:
README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

Summary:
1. Read the manual or user guide. Have you read the manual? Can you find the manual?
2. Search the forums (and search the web) for similar topics.
3. Do not post the same question on multiple forums.
4. Do not post a new topic or question on someone else's thread, start a new thread!
5. Students: Copying code is not the same as learning to design.
6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).
7. You are not charged extra fees for comments in your code.
8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.
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bassman59
Posts: 4,679
Registered: ‎02-25-2008
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Re: select io wizard 3.3 and spartan 6

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‎03-29-2012 09:42 AM

olliie wrote:

I have create an LVDS interface with the coregen wizard

The problem I've had is that it creates a IBUFGDS_DIFF_OUT component for the incomming clock.

With ISE 13.4 this is completely unplaceable anywhere.

 

I've changed it to a IBUFDS_DIFF_OUT and now i get through PAR.

 

My question is will this affect the timing of this interface? and is this the right thing to do.

 

Also can you fix either the wizard or ISE ?

 

Cheers

Why use CoreGen for this?

Simply instantiate the proper buffer in your code.


----------------------------------------------------------------
Yes, I do this for a living.
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