The Knowledge Base shows that Vcc (0.9V), and Vccp (1.8V) should come up before Vcceram (0.9V), Vccr_gxb (1.8V), and Vcct_gxb (0.95V). This requires splitting the voltages and adding power switches to sequence the voltages. Is this required?

Question

What are the ramifications of not sequencing these power rails?  Does it cause configuration issues, functional problems, or long term reliability issues?

badam1 · Answer

This is for a Cyclone 10 GX device.  The device part number is 10CX085YU484I5G.

busy · Answer

Intel recommends power sequencing... If you do not respect them, correct behaviour is not guaranteed and the causes of the dysfunctions may be difficult to detect.AN692 can help you...

jonway_altera · Answer

Thanks @Busy​  Just to top up some info for @BAdam1​ , you may also want to refer to the https://www.intel.com/content/www/us/en/programmable/documentation/vua1487061384661.html#qwj1528888537561You will need to follow the sequencing, to guarantee the reliability and not to damage the device.

Forum Discussion

The Knowledge Base shows that Vcc (0.9V), and Vccp (1.8V) should come up before Vcceram (0.9V), Vccr_gxb (1.8V), and Vcct_gxb (0.95V). This requires splitting the voltages and adding power switches to sequence the voltages. Is this required?

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