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Altera_Forum
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16 years ago

Can't explain why the required tsu be larger than the actual one

In Classic Timing Analysis, the equation of the slack is Required-actual,it is OK when it is positive and its not when negative. From the configuration of the tsu in quartus ii, we get that we can de...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

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Hi,pletz,

Glad to receive your reply.What I said is within the FPGA,no driving source,except the power supply device.What I mean is that we should define the minimal value,not the max one,cause that the setuptime is a margin that the much the better.So the slack should be actual - required.

regards

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Hi,

tsu and tco settings define the requirements for the inputs and outputs of the FPGA. They are not used for the internal timing. The internal setup and hold requirements are handled by Quartus itself by defining the required clock speed.

Kind regards

GPK