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12408 Discussions

Cyclone v HPS SDRAM PLL source

Honored Contributor I

According to handbook, there are 3 plls inside HPS. And one of them is SDRAM PLL. SDRAM PLL source can be programmed to EOSC1, EOSC2 or f2h_reference_clk. But i could not find anywhere in Qsys to change this. 

Is it possible to switch the pll source in GUI, or it has to be done in the generated codes manually? 

Thank you.
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1 Reply
Honored Contributor I

You are right, it looks like there is no selection in the HPS Qsys component. Perhaps you should file a ticket to Altera to fix this :) 


Currently it looks like user will need to modify the file pll_config.h in the hw/sw handoff folder