Re: Power consumption problem

Amine.Miled@xxxxxxxxx wrote:
On 12 juin, 04:05, Jim Granville <no.s...@xxxxxxxxxxxxxxxxxxxxxx>
wrote:

Amine.Mi...@xxxxxxxxx wrote:

Hi,

when i implemented my architecture using ACTEL AFS600 (Fusion family)
i noticed that over 16MHz there is a gap in consumption, in fact when
i was changing my frequency from 1 kHz to 16 Mhz the power consumption
is varying from 13 mW till 20 mW when i reach 16 MHz there is a gap
and the power consumption jump directly to 30 mW,
anyone has any reason to explain this gap?

my speed grade is -2,

Is it operating normally over that threshold ?
Normally, such a current discontinuity, also infers
an operational discontinuity.

Does the slope continue at just under 0.5mW/Mhz above that threshold ?

I'd test again with some simpler code, that you know has a very high Fmax.

-jg


that's the problem: the FPGA is still working good.
Yes the slope continue at just 0.5mW/Mhz above that threshold,
i tested the FPGA with other code and what s strange is that this
discontinuity still exist but for higher frequency (again the fpga is
still working good)

Yes, that does sound strange - what was the higher freq in the other test ?
16MHz should be 'low' by FPGA standards - were you using (or had enabled?) any of the PLL/Clock multiplier resources ?

Did you ask Actel ? - those symptoms suggest they might not
be disabling everything they should, in the SW process ?

-jg

.

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