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Beginner
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What's state of I/O pins in Cyclone V GX FPGA, during POR, Configuration, & Initialization state ?

In 2011 documentation i found it as tri state during POR and Configuration. But in Latest Documentation , there is flowchart that shows all I/O pins are weak Pull Up. PLease clarify the value of all I/O pins during the 3 states of POR,Config and Initialization?

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Employee
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Hi Kapil,

 

Weak Pull Up means that the I/O is in tri-state. Thus, all I/O pin are in tri-state during POR, Configuration.

 

Regards,

YL

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Beginner
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Thanks for clarifying. Can you please tell, After Configuration and till all Registers are initialized, do I/O pins remain in tri-state? ie the the first value output on I/O line is the initialized value after an I/O leaves tri-state? is that understanding correct?. having issues on board regarding power sequence implementation in cyclone V FPGA.

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Employee
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Hi Kapil,

 

Yes, unused IO will remain tri-state. May i know what is the problem with power sequence?

 

Regards,

YL

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