Is hold time can be negative?

[shiva_107]

can time be negative

The answer is yes, but how is this possible. I mean how should i design my flipflop to get a hold time negative.
If i have a huge skew between clk and clkbar in flip flop or something else.

 

[shelby]

negative hold time

not sure if this is a good FF design or not, but if you buffer your D input inside the FF then your hold time can be negative. Of coarse this also makes your setup time worse.

 

[rakesh1234]

Yes in case of scan flops where it has mux at the D pin of the flop it could be negative