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Altera_Forum
Honored Contributor I
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Cyclone IV GX PLL static power

Cyclone IV FPGA PLL power have 2 components  

1. Analog - VCCA (2.5V) 

2. Digital - VCCD_PLL (1.2V) 

 

Powerplay power analyzer reports & board measurements (GX development) shows static current as 34mA for analog supply (VCCA) even when PLL is not in used in design. Why PLL static power is so high ? Is there any way to shut off the static power. 

 

Thanks, 

N
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2 Replies
Altera_Forum
Honored Contributor I
58 Views

Both supplies have to be powered even if the PLLs are not used. Refer to the pin connection guidelines: 

 

https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/dp/cyclone-iv/pcg-01008.p...
Altera_Forum
Honored Contributor I
58 Views

Thanks rsefton. I got it. 

 

I also see increase in static power by enabling more PLLs in the design. Is this an expected behavior? 

 

Regards, 

N
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