13-Value Example
CE-653 - Hazards and Analysis Methods
27
}CLK = <1, v, 0>, D = <1, 1, 1>
}Evaluate node e
}a = b = <1, v, 0>, c = <0, ^, 1>, e = <1, X, 1>
}Very conservative as it is based on zero delay gate model
}assumes no control over gate delays
d-latch-example.jpg
18/3/2014
SR latch is active low – d = (D . CLK)’, e = ((D . CLK)’ . CLK)’ = ((D’ + CLK’) . CLK)’ =
(D’ . CLK + CLK’ .CLK)’ = (D’ . CLK)’ . (CLK’.CLK)’ = (D’ . CLK)’ . 1