Latches

Latches - Latches Password_None Copyright 2009 Daniel...

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

View Full Document Right Arrow Icon
Latches Password____None _________ © Copyright 2009 Daniel Tylavsky
Background image of page 1

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

View Full DocumentRight Arrow Icon
Combinational Logic Circuits: Present State (output) depends only on present value of the inputs. Sequential Circuits: Present State depends on the present input AND previous state. R S Latches
Background image of page 2
Latch- a storage device with one input used for storing a “1” and one input used to store a “0”. R S Q Q Q (State) is the stored output of the device. Reset (R) input resets the state to “0”. Set (S) input sets the state to “1”. Latches
Background image of page 3

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

View Full DocumentRight Arrow Icon
Let: Q= Present State of the device Q + = Next State of the device Let’s show that the static device characteristics are as follows: S R Q + 0 0 Q 0 1 0 1 0 1 1 1 ---- Invalid State R S Q Q Latches
Background image of page 4
S R Q + 0 0 Q 0 1 0 1 0 1 1 1 ---- R S Q Q R S Timing Diagram Q Q 0= 0= S->1, 1 T =0 =1 0 Gate Delay 1 S->0, 0 R->1, 1 0 1 S->1 1 0 Start in a state of “0.” Assume R=S=0 initially. Assume gate delay = 0. Writing “1” Storing “1” Writing “0” Storing “0” Invalid State Latches
Background image of page 5

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

View Full DocumentRight Arrow Icon
Open “rs_nor.cct” and determine that the
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 10/21/2010 for the course CSE 120 taught by Professor Matar during the Spring '08 term at ASU.

Page1 / 12

Latches - Latches Password_None Copyright 2009 Daniel...

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