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SK_VA's avatar
SK_VA
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

How to constrain Jtag signals of Cyclone 4 FPGA?

I constrained all I/Os of my FPGA Cyclone 4 device.

But still it shows unconstrained path for jtag signals:-

altera_reserved_tdi,altera_reserved_tdo,altera_reserved_tms,altera_reserved_tck.

Can I set Jtag signals as false path?

How to constrain these signals?

3 Replies

  • SK_VA's avatar
    SK_VA
    Icon for Occasional Contributor rankOccasional Contributor

    These are reserved signals.But Timing analysis shows unconstrained paths for these pins.

    How to solve this?

    • Knug's avatar
      Knug
      Icon for Contributor rankContributor

      Same question I have.

      Timing STA analysis showed

      • no output delay : altera_reserved_tdo
      • no input delays : altera_reserved_tms, altera_reserved_tck & alrera_reserved_tdi

      How do we constrain them ?