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SudheerV's avatar
SudheerV
Icon for New Contributor rankNew Contributor
4 years ago
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Cyclone V QSPI AS Configuration timing data

Hi, We are using Cyclone V (5CGXFC7B6M15I7N) in on of our design. We are doing the timing budget analysis for QSPI NOR Flash interface (AS Configuration). FPGA datasheet shows the DATA[] hold time...
  • TravisCovert's avatar
    TravisCovert
    4 years ago

    Hi Sudheer,

    You can use the 1.5nS. That will also protect you if you need to change to EPCQ-A device in the future because the EPCQ device is EOL (https://www.mouser.com/pcn/intel_corporation_pdn1708_rev_1.0.0.pdf).

    There is not much functional difference between the two. I think Intel's supplier for EPCQ shut down so they had to create a new part and called it EPCQ-A.

    Thanks,

    Travis

TravisCovert's avatar
TravisCovert
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

Hi Sudheer,

Please refer to the Device Handbook in the section on Evaluating Data Setup and Hold Timing.

https://www.intel.com/content/www/us/en/docs/programmable/683375/current/evaluating-data-setup-and-hold-timing.html

Cyclone V Device Timing: https://www.intel.com/content/www/us/en/docs/programmable/683801/current/active-serial-as-configuration-timing.html

Here is a migration guide that can also help. https://www.intel.com/content/www/us/en/docs/programmable/683340/current/fpga-configuration-device-migration.html

Be careful when calculating the hold time. You might need to add a 10pF capacitor on the data lines if you cannot meet the hold time in the calculation.

If you look at the timing waveforms, the data is captured on the falling edge.

Thanks,
Travis Covert

[email protected]