Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
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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?

BAdam1
Beginner
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What are the ramifications of not sequencing these power rails? Does it cause configuration issues, functional problems, or long term reliability issues?

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BAdam1
Beginner
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This is for a Cyclone 10 GX device. The device part number is 10CX085YU484I5G.

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Busy
Novice
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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...

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JonWay_C_Intel
Employee
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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#qwj1528888537561

 

You will need to follow the sequencing, to guarantee the reliability and not to damage the device.

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