FreeLists / si-list / [SI-LIST] Re: Random behaiour of Virtex 4 FPGA

[steve weir <weirsi@xxxxxxxxxx>]

Vijayan, it sounds like you have PCB defects by design or fabrication.


Steve.

vijayan wrote:
> Hi all,
> I am using  Virtex 4 FPGA (XC4VFX100) in our application. In this, we find 
> some random behaiour of FPGA.
>
> Whenever the bit file is loaded into the FPGA, there is a drop in core 
> voltage(power module getting shutdown).Bit file gives such random behaviour 
> uses particular three banks for its logic. Here we thought like this, it may 
> be due to any internal damage in FPGA IOBs around that three banks.
>
> Here is the few points added,
>
> * We tried with a bit file that has high logic utilization (logic is not on 
> that faulty banks. it uses other banks). It works fine.
> * Also we tried some other bit files with low logic utilization using that 
> banks is working properly (power won't disturbed).
> * Whatever signals from that faulty banks are not shorted with VCC/GND. We 
> probed it.
> * Good core voltage power solution.
>
> Pls suggest me the solution to identify the exact source of that random 
> behaviour.
>
> Regards,
> Vijayan Sivamani
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