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11,199 Views
Registered: ‎01-30-2014

ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

Hi,
I am a beginner on synthesis and implementation and i am developing a university project using a Virtex 7 board.

I have got this error during the implementation phase with Vivado 2013.3:

[Vivado_Tcl 4-131] Power Optimization encountered an exception: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

 As the message says, there is an error during the Power Optimization. Actually the Log file does not even say where it encounterd the error exactly, and i have no idea what is 'i_gnet'.

The implementation works as long as i remove all the optimization settings, but doing in this way i get a very bad timing result, especially due to a clock of 500Mhz received as input on the top module and spreaded all around my logic without using any MMCM. 


Does anybody know how can i correct this error or at least other ways to recover the bad timing analysis?

Thanks

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9 Replies
Xilinx Employee
Xilinx Employee
11,194 Views
Registered: ‎09-20-2012

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

Hi,

 

Can you check this in vivado 2013.4?

 

Did you disable opt_design phase too? Rather than disabling the complete opt_design phase, you can just disable BRAM power optimization phase of opt_design. Write the below switches in more options field of opt_design.

 

 -retarget -propconst -sweep

 

Capture.PNG

 

Thanks,

Deepika.

Thanks,
Deepika.
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Community Manager
Community Manager
11,191 Views
Registered: ‎06-14-2012

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

There was a known CR for this power_opt. The number is 

743771.

 

This is fixed in 2013.4. Please try in 2013.4 and update us.

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11,179 Views
Registered: ‎01-30-2014

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

Thanks for your reply. 
Tomorrow, once back in my office, i will upgrade vivado and try again. 

However, i disabled opt_design to avoid optimizations. I will also try yout trick

 

Antonio

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Community Manager
Community Manager
11,177 Views
Registered: ‎06-14-2012

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

Sure Please keep me posted. If it doesnt work in 2013.4, we have to investigate and file a CR if applicable.

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11,176 Views
Registered: ‎01-30-2014

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

Ok, i will upgrade it and try again.
Do you think i will have problems with my design suite license with the upgrade?

Antonio
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Community Manager
Community Manager
11,173 Views
Registered: ‎06-14-2012

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

Please check with the version limit of your license. 

The following AR mentions the least duration of the version limits.

 

http://www.xilinx.com/support/answers/33770.htm

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11,142 Views
Registered: ‎01-30-2014

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

The trick proposed by vemulad worked. 
Actually i still have to upgrade Vivado to the 2013.4 version. In the next few days, i will let you know when i will have done.

In the meanwhile thanks to everyone.

 

Antonio

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Community Manager
Community Manager
11,137 Views
Registered: ‎06-14-2012

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

Thanks for your update. Please keep us posted. 

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Community Manager
Community Manager
11,044 Views
Registered: ‎06-14-2012

Re: ERROR: [Common 17-70] Application Exception: i_gnet->isConstant()

antonio.verlotta  Did you get a chance to run this in latest toosl ?
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