Scicos Block
fr - eng

##
SR flip-flop

### Contents

- SR flip-flop
  - Palette
  - Description
  - Dialog box
  - Default properties
  - Interfacing function
  - Compiled Super Block content
  - See also
  - Authors

### Palette

- Integer - Integer palette

### Description

This block describe the simplest and the most fundamental latch the SR flip flop. Where S and R are the input and Q and !Q are the outputs.If S (Set) is pulsed high while R is held low, then the Q output is forced high, and stays high when S returns low; similarly, if R (Reset) is pulsed high while S is held low, then the Q output is forced low, and stays low when R returns low. When both are low, Q(t) takes the same state as Q(t-1). When they are both high, both Q and !Q take the low values we are in an unstable state. Practically we have to avoid this case.This block is almost used with digital number, the input data type is int8.

The truth table of this block is

S | R | Q(t) | !Q(t)
0 | 0 | Q(t-1) | !Q(t-1)
0 | 1 | 0 | 1
1 | 0 | 1 | 0
1 | 1 | 0 | 0
-> This case is to avoid |  |  |

### Dialog box

- Initial Value
  Initial Value of the state Q.
  Properties : Type 'vec' of size 1.

### Default properties

- always active: no
- direct-feedthrough: yes
- zero-crossing: no
- mode: no
- regular inputs:
  - port 1 : size [1,1] / type 5
  - port 2 : size [1,1] / type 5
- regular outputs:
  - port 1 : size [1,1] / type 5
  - port 2 : size [1,1] / type 5
- number/sizes of activation inputs: 0
- number/sizes of activation outputs: 0
- continuous-time state: no
- discrete-time state: no
- object discrete-time state: no
- name of computational function: csuper

### Interfacing function

- SCI/macros/scicos_blocks/IntegerOp/SRFLIPFLOP.sci [view code]

### Compiled Super Block content

### See also

- DLATCH - D latch flip-flop (Scicos Block)
- DFLIPFLOP - D flip-flop (Scicos Block)
- JKFLIPFLOP - JK flip-flop (Scicos Block)

### Authors

Fady NASSIF INRIA