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xytech's avatar
xytech
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7 years ago

Can A10 INIT_DONE be pulled up to 3.3V?

Hi there, We plan to connet INIT_DONE signal to MCU(3.3V) so we could know when A10 FPGA enters user mode. Although INIT_DONE is an Open-Drain output, however, A10 pin-connection guide.pdf page10 ...
ChiaLing_T_Intel's avatar
ChiaLing_T_Intel
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7 years ago

Hi,

By referring to Arria 10 Device Datasheet, the maximum value of VCCPGM is 1.89V.

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/arria-10/a10_datasheet.pdf

When you use the optionally open-drain output dedicated INIT_DONE, you would need to connect this pin to an external 10kohm pull up resistor to VCCPGM. Since the VCCPGM can only be connected to 1.2V, 1.5V and 1.8V power supply, you should NOT pull up to 3.3V.

Thank you

Wishing you a Happy New Year!

Regards,

Chia Ling

  • xytech's avatar
    xytech
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    7 years ago

    Hi Ling,

    Thanks for answer.

    Although PCG doc tells that we shoud pull up this pin to VCCPGM, however, I am not sure about INIT_DONE pin is powered by who. From pin-out file and Quartus Pin Planner, this pin locates at Bank 2A​ (pin AG18) rahter than Bank CSS. To me, it seems that INIT_DONE should be pull up to VCCIO_Bank2A.....How do you think?

    XY