lec11 - CS 140 Lecture 11 Sequential Networks: Timing and...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
CS 140 Lecture 11 Sequential Networks: Timing and Retiming Professor CK Cheng CSE Dept. UC San Diego 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sequential Networks Timing: Setup Time and Hold Time Constraints D Q Q’ CLK 2
Background image of page 2
Combinational CLK CLK A B C A typical sequential network has both a combinational circuit and flip-flips. D Sequential Networks 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Combinational CLK CLK A B C t cq + t comb + t setup < T t hold < t cq + t comb Clock period Shortest path 4
Background image of page 4
Input Timing Constraints • Setup time: t setup = time before the clock edge that data must be stable (i.e. not changing) • Hold time: t hold = time after the clock edge that data must be stable • Aperture time: t a = time around clock edge that data must be stable ( t a = t setup + t hold ) CLK t setup D t hold t a 5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
• Propagation delay: t pcq = time after clock edge that the output Q is guaranteed to be stable (i.e., to stop changing) • Contamination delay: t ccq = time after clock edge that Q might be unstable (i.e., start changing) CLK t ccq t pcq Q 6
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/07/2011 for the course CSE 140 taught by Professor Rosing during the Spring '06 term at UCSD.

Page1 / 17

lec11 - CS 140 Lecture 11 Sequential Networks: Timing and...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online