Shift register

Library

Linear

Description

This block realizes a shift register. At every input event, the register is shifted one step.

Dialog Box

Set delay parameters
Register initial condition	0;0;0;0;0;0;0;0;0;0

• Register initial condition: A column vector. It contains the initial state of the register.

Default properties

• always active: no
• direct-feedthrough: no
• zero-crossing: no
• mode: no
• number/sizes of inputs: 1 / 1
• number/sizes of outputs: 1 / 1
• number/sizes of activation inputs: 1 / 1
• number/sizes of activation outputs: 0 /
• continuous-time state: no
• discrete-time state: yes
• name of computational function: delay

Interfacing function

scilab/macros/scicos_blocks/linear/REGISTER_f.sci

Computational function (type 0)

      subroutine delay(flag,nevprt,t,xd,x,nx,z,nz,tvec,ntvec,
     &     rpar,nrpar,ipar,nipar,u,nu,y,ny)
c     Copyright INRIA

c     Scicos block simulator
c     Ouputs nx*dt delayed input
c
      double precision t,xd(*),x(*),z(*),tvec(*),rpar(*),u(*),y(*)
      integer flag,nevprt,nx,nz,ntvec,nrpar,ipar(*)
      integer nipar,nu,ny

c
      if(flag.eq.1.or.flag.eq.4.or.flag.eq.6) then
         y(1)=z(1)
      elseif(flag.eq.2) then
c     .  shift buffer   
         do 10 i=1,nz-1
            z(i)=z(i+1)
 10      continue
c     .  add new point to the buffer
         z(nz)=u(1)
      endif
      end