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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Timing constraints

Hi,

I followed instructions on the toutorial for Time Quest Analyzer, in order to put a constraint on my clock input to the design.

I chose the clock (clock_50), and gave it a 10ns constarint.

still i get the following - Warning (332060): Node: CLOCK_50 was determined to be a clock but was found without an associated clock assignment.

can anyone advise?

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor

    You didn't show your constraint, but SDC is case sensitive by default. (I think there's a -no_case option with a lot of them).

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor

    Hi,

    thanks for the answer..

    here is the constraint (BTW, i generated it through the create clock option in the Time Quest Analyzer GUI):

    # **************************************************************

    # Time Information

    # **************************************************************

    set_time_format -unit ns -decimal_places 3

    # **************************************************************

    # Create Clock

    # **************************************************************

    create_clock -name {CLOCK_50} -period 10.000 -waveform { 0.000 5.000 } [get_ports {CLOCK_50}]

    # **************************************************************

    # Create Generated Clock

    # ********
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor

    Did you include the .sdc file on your project? (Assignments -> Settings -> Timequest Timing Analyzer)