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Altera_Forum
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17 years ago

setup and hold time with set_input_delay

Hello,

I have some problem understanding the set_input_delay min and max

constraint.

Assume that you have an interface that is connected to an FPGA.

This interface has a clock (Clk) and a databus (DB).

The datavalid window is centered around the rising edge of Clk. Assume

a setup time of 1ns and a hold time of 2 ns. The clk period is 10 ns.

How should I constrain this with the set_input_delay command?

thanks for helping me,

21 Replies

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

    Rysc, thank you kindly for your posts and clearing up IO constraints. The Quartus Documentation is extremely shotty. Thanks again.