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Altera_Forum's avatar
Altera_Forum
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12 years ago

Is it a mistake"Tco_ext = Tsu of external device"

hello, I learned a lot from the "TimeQuest User Guide" edited by Rysc. But I was confused that the Tco_ext has different expression on page 20 and page 21 as follows: P20 External device pa...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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You are right but TCO_ext is not = TCO of external device rather it is just another name for it.

The issue you raised is because some chips do not give you TCO but rather tSU/tH required at receiving device and then this translates to:

TCO(max) = UI - tSU

TCO(min) = tH

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Thank you,kaz.

TCO(max) = UI - tSU，UI is the Tperiold? how to understand your translation" TCO(max) = UI - tSU; TCO(min) = tH". Is there any reference paper to introduce this relationship?