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LauraC
Beginner
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Perturbations on altera cyclone IV e configuration signals

Hi,

My question is about the Nstatus and ConfDone signals behavior when Nconfig is submitted to perturbations:

Assuming we have a 10kohm pull-up with the 3V3 on Nconfig as suggested by Altera's documentation, and a short but high perturbation occurs forcing Nconfig to less than 1V during a few hundreds nanoseconds, how does an Altera Cyclone IV e react? During this short amount of time, will the Users I/O turn to High Z? is the FPGA going in reset state? How about Nstatus and Confdone signals?

 

 

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ShafiqY_Intel
Employee
101 Views

 

Hi LauraC,

 

If the nCONFIG is driven LOW in short amount of time, the FPGA will go to RESET state. 

And the USER I/Os are tri-stated until the device enters user mode.

sss1412674135661.jpg

 

Thanks.

Regards,

Matt

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