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ANBARASU's avatar
ANBARASU
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11 months ago

CYCLONE V FPGA POWER-UP SEQUENCE

Currently i am using the below cyclone V FPGA for my design, Part: 5CGTFD7D5F27I7N As per the CV-52001 (2023.10.18) -Volume 1: Device Interfaces and Integration The recommended power-up sequence g...
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Farabi's avatar
Farabi
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11 months ago

Hello,


Ok, you may ramp up together VCCPD=2.5V and VCCIO=1.35V. Otherwise, VCCPD need to ramp up first then VCCIO. Both ways will make the device power up successfully.


regards,

Farabi


  • ANBARASU's avatar
    ANBARASU
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    11 months ago

    Hi Farabi,

    Thanks ! I got all queries resolved. Summary,

    1) VCCPD Current transient:

    Feedback:

    It is important to power up all the power rails in Group 1 first, followed by Group 2 to avoid this kind of failure.

    The maximum current transient will be ~1000mA for at least 50us will happen if you dont follow the power up sequence. You may need to add decoupling capacitors to smoothen the current transient if you dont follow the power up sequence. So to avoid this, it is recommended to follow the power up sequence as mention in user guide.

    2) VCCPD and VCCIO different voltage at same bank

    Feedback:

    Ok, you may ramp up together VCCPD=2.5V and VCCIO=1.35V. Otherwise, VCCPD need to ramp up first then VCCIO. Both ways will make the device power up successfully.