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Manuel Scilab >> xcos > palettes > Integer palette > SRFLIPFLOP

SRFLIPFLOP

SR flip-flop

Block Screenshot

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/modules/scicos_blocks/macros/IntegerOp/SRFLIPFLOP.sci

Compiled Super Block content

Authors

Fady NASSIF - INRIA

Scilab Enterprises
Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors
Last updated:
Wed Jan 26 16:24:17 CET 2011