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Altera_Forum's avatar
Altera_Forum
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14 years ago

Active parallel/serial configuration of FPGA

Hi friends,

In QUartus II,When i set configuration as Active parallel/serial,the dual purpose pins get set according to the chosen configuration.It means the flash pins which are used to configure FPGA,get assigned to nodes by default(i.e. with node names which start like this ~ALTERA_pinname~).

So,i am not able to assign those pin to the exact location in the assignment editor/pin planner.If i assign,Fitter gives an error as "can't locate multiple nodes to the same pin".

but without assigning them to exact locations,if i run the fitter,i'm getting a warning as " those pins are not assigned to the exact location".Will this cause any problem while flashing the program.

Please reply me,if anyone knows about thjs?

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Do you mean you want to use these dual purpose pins as normal user pins after configuration? In that case, you need to set them in Assignments -> Settings -> Device -> Device and Pin Options .. -> Dual-Purpose Pins (from Quartus II main menu).

    As for the configuration function of these pins, Quartus II will take care of everything. It always knows which pins to use and their locations on your device, once you have set your configuration scheme.
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Hi wdshen,

    Thanks for your reply. From online service request,i got to know that there is a bug in the Quartus II tool version 10.0.So,in order to set dual purpose pin as "use as regular i/o" after configuration of FPGA,we have to manually add lines in .qsf file.

    I did the same,now it is okay.

    Regards,

    Raghavendra.S