cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
saranshmeh
Adventurer
Adventurer
5,801 Views
Registered: ‎04-09-2010

Routing issues in Virtex 6

Hello,

 

I am using xc6vlx760-2ff1760 FPGA. The resource utilization as shown by synplify is 50% only. But while doing PAR on ISE, I find that there are many signals being unrouted. (Even due to which, ISE threw error and stopped)

 

I have went through the manual for v-6 logic optimizations (to avoid routing congestion) available on xilinx website, but most of it talks about manual techniques. Are there some attributes and constraints available to avoid so? What other steps I could take for its optimization?

 

Thanks and regards

Saransh

0 Kudos
3 Replies
evgenis1
Advisor
Advisor
5,791 Views
Registered: ‎12-03-2007

Hi Saransh,

 

A few questions:

 

Why do you think it's the routing congestion that is causing the error ?

What's your clock frequencies ?

What is the utilization reported by MAP ?

Is the design floorplanned ?

Have you tried running PAR without timing constraints ?  Sometimes when PAR fails to meet timing in a large chip it gives an error. Doing PAR without timing constraints (or relaxed timing, such as 25MHZ instead of 250) can give some clues.

 

 

Thanks,

Evgeni

Tags (1)
0 Kudos
viviany
Xilinx Employee
Xilinx Employee
5,785 Views
Registered: ‎05-14-2008

Why do you post a routing issue on the Synthesis board?

Routing is one of the processes of Implementation. Your question should go to the Implementation board. I'll move your message to that board.

 

Vivian

-------------------------------------------------------------------------------------------------
Don’t forget to reply, kudo, and accept as solution.
-------------------------------------------------------------------------------------------------
如果提供的信息能解决您的问题,请标记为“接受为解决方案”。
如果您认为帖子有帮助,请点击“奖励”。谢谢!
-------------------------------------------------------------------------------------------------
0 Kudos
bwade
Scholar
Scholar
5,769 Views
Registered: ‎07-01-2008

0 Kudos