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Visitor samitbanerji
Visitor
8,358 Views
Registered: ‎06-16-2010

unable to understand current variations using Digilent Adept power meter

I am booting up linux on my Digilent Atlys board and using adept for power and current measurements. I notice a drop in current and power on the 1.2V rail (used by the FPGA) and a rise in the 1.8V rail (used by the DDR2) whenever i run a process. Can anyone explain this variation? 

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Scholar austin
Scholar
8,343 Views
Registered: ‎02-27-2008

Re: unable to understand current variations using Digilent Adept power meter

s,

 

When running, less power is needed for the 1.2v, and more power is needed on the 1.8v.

 

What is the process you run?  If it runs and uses DDR, then the DDR memory needs more power.  While the DDR memory gets refreshed, accessed, and it row or column changes, the processor may be just idle (waiting), so the 1.2v draws less power....

 

Do you caches for the MicroBlaze(tm) in the FPGA?  What happens if you make the caches larger?

Austin Lesea
Principal Engineer
Xilinx San Jose
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