cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Visitor
Visitor
8,345 Views
Registered: ‎12-25-2013

place and route problem

I have a current design that I want to keep its exact routing. When I add more circuits to this design, it changes the routing of the original design, even though the new circuitry does not effect the original design. 

 

when I use UCF constraints to constrain the original design to the updated design, many nets are changed and the design will not map.

 

How would I go about this problem? 

0 Kudos
Reply
6 Replies
Scholar
Scholar
8,343 Views
Registered: ‎02-27-2008

r,

 

Why do you care?  What problem are you trying to solve?

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose
0 Kudos
Reply
Scholar
Scholar
8,332 Views
Registered: ‎07-01-2008

It sounds like the design coming out of synthesis no longer matches the UCF constraints leading to errors. You can get around this by applying the constraints in the RTL so that the resulting names no longer matter. I could give a more specific answer if you told us what constraints you are using and what errors you are seeing. I would also like to know what problem you are trying to solve with this approach.

0 Kudos
Reply
Community Manager
Community Manager
8,319 Views
Registered: ‎07-23-2012

If you don't want to disturb the initial part of the design, why don't you consider partitioning the design. Refer to http://www.xilinx.com/support/documentation/sw_manuals/xilinx13_1/Hierarchical_Design_Methodology_Guide.pdf for more details.

-----------------------------------------------------------------------------------------------
Please mark the post as "Accept as solution" if the information provided answers your query/resolves your issue.

Give Kudos to a post which you think is helpful.
0 Kudos
Reply
Visitor
Visitor
8,272 Views
Registered: ‎12-25-2013

I'm using a phase detector with state machine with a 65ps windows that needs dedicated routing

0 Kudos
Reply
Visitor
Visitor
8,270 Views
Registered: ‎12-25-2013

bwade,

 

that is just what I was looking for.

 

Thanks

0 Kudos
Reply
Visitor
Visitor
8,269 Views
Registered: ‎12-25-2013

smarell,

 

This document will be great for bigger projects. 

 

Thanks

0 Kudos
Reply