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,
Regards, A.
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)
A.
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
ax.
?the maximum frequency is 37 MHz, and no i m not using any PLL, I asked atcel but i m still waiting for the answer!!!
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