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"Input setup time" and "Input hold time"
softwareguy85
#1 Posted : Thursday, October 31, 2013 4:40:41 AM(UTC)
Rank: Newbie

Joined: 10/31/2013(UTC)
Posts: 2

hi all,

I'm a new to hardware, I have a question that you may find very basic. I'm reading a processor manual for an
mpc8568 and it give two values for Power on reset configs (POR) that I don't understand.

1) "Input setup time for POR configs (other than PLL config) with respect to
negation of HRESET" .....Min 4 SYSCLKs
2)"Input hold time for all POR configs (including PLL config) with respect to
negation of HRESET" .....Min 2 SYSCLKs

Both minimum values are given with respect to the negation of HRESET. How could minimum "hold time" have a value less than minimum "setup time" ?

Considering the "setup time" requirement would have to be satisfied before "hold time", I don't understand how "hold time" can have a lesser minimum value.

thank you!
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