TITLE      Registro universal de desplazamiento de 4 bits
PATTERN    eDigital_PRA11
REVISION   1.0
AUTHOR     F.G.S.
COMPANY    DIEEC/UNED DIEEAC/UCLM
DATE       03/11/2005



CHIP  REGUNI4BITS  PAL16R6

PIN 1 CLK 
PIN 2 A 
PIN 3 B 
PIN 4 C 
PIN 5 D 
PIN 6 CLEAR 
PIN 7 LOOP 
PIN 8 INV 
PIN 10 GND 
PIN 11 OE 
PIN 12 S1 
PIN 13 QD 
PIN 14 QC 
PIN 15 QB 
PIN 16 QA 
PIN 19 S0 
PIN 20 VCC 



EQUATIONS



     /QA  :=  /CLEAR 
           +  S1 * S0 * /A 
           +  S0 * /LOOP * /A 
           +  /S1 * /S0 * /QA 
           +  S1 * /S0 * /QB 
           +  /S1 * S0 * LOOP * INV * QD 
           +  /S1 * S0 * LOOP * /INV * /QD
     /QB  :=  /CLEAR 
           +  /S1 * /S0 * /QB 
           +  /S1 * S0 * /QA 
           +  S1 * /S0 * /QC 
           +  S1 * S0 * /B
     /QC  :=  /CLEAR 
           +  /S1 * /S0 * /QC 
           +  /S1 * S0 * /QB 
           +  S1 * /S0 * /QD 
           +  S1 * S0 * /C
     /QD  :=  /CLEAR 
           +  S1 * S0 * /D 
           +  S1 * /LOOP * /D 
           +  /S1 * /S0 * /QD 
           +  /S1 * S0 * /QC 
           +  S1 * /S0 * LOOP * INV * QA 
           +  S1 * /S0 * LOOP * /INV * /QA


SIMULATION

     TRACE_ON     CLK  QA  QB  QC  QD
     SETF     /OE  /CLEAR  /LOOP  /INV  A  B  C  D  
              /S1  /S0
     CLOCKF     CLK
     SETF     CLEAR  S1  /S0  LOOP  INV
     CLOCKF     CLK
     WHILE  QA +  QB +  QC +  QD  DO  BEGIN
          CLOCKF     CLK
     END
     SETF     CLEAR  /S1  S0  LOOP  INV
     CLOCKF     CLK
     WHILE  QA +  QB +  QC +  QD  DO  BEGIN
          CLOCKF     CLK
     END
     TRACE_OFF