PAL20X10                                      PAL DESIGN SPECIFICATION
P7008 (PMSI405)                                  BIRKNER/COLI 07/19/81
9-BIT REGISTER
MMI SUNNYVALE, CALIFORNIA
CLK D0 D1 D2 D3 D4 D5 D6 D7 D8 /LD GND
/OC NC Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1  Q0 VCC
 
 
/Q0 := /Q0*/LD     ;HOLD Q0
     + /D0* LD     ;LOAD D0
 
/Q1 := /Q1*/LD     ;HOLD Q1
     + /D1* LD     ;LOAD D1
 
/Q2 := /Q2*/LD     ;HOLD Q2
     + /D2* LD     ;LOAD D2
 
/Q3 := /Q3*/LD     ;HOLD Q3
     + /D3* LD     ;LOAD D3
 
/Q4 := /Q4*/LD     ;HOLD Q4
     + /D4* LD     ;LOAD D4
 
/Q5 := /Q5*/LD     ;HOLD Q5
     + /D5* LD     ;LOAD D5
 
/Q6 := /Q6*/LD     ;HOLD Q6
     + /D6* LD     ;LOAD D6
 
/Q7 := /Q7*/LD     ;HOLD Q7
     + /D7* LD     ;LOAD D7
 
/Q8 := /Q8*/LD     ;HOLD Q8
     + /D8* LD     ;LOAD D8

 
FUNCTION TABLE
 
/OC CLK /LD D8 D7 D6 D5 D4 D3 D2 D1 D0 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0

;/ C /    DATA IN     DATA OUT
;O L L   DDDDDDDDD   QQQQQQQQQ
;C K D   876543210   876543210     COMMENT
----------------------------------------------------------
 L C L   LLLLLLLLL   LLLLLLLLL     LOAD ALL ZEROS
 L C H   XXXXXXXXX   LLLLLLLLL     HOLD ALL ZEROS
 L C L   HHHHHHHHH   HHHHHHHHH     LOAD ALL ONES
 L C H   XXXXXXXXX   HHHHHHHHH     HOLD ALL ONES
 L C L   LHLHLHLHL   LHLHLHLHL     LOAD EVEN CHECKERBOARD
 L C H   XXXXXXXXX   LHLHLHLHL     HOLD EVEN CHECKERBOARD
 L C L   HLHLHLHLH   HLHLHLHLH     LOAD ODD  CHECKERBOARD
 L C H   XXXXXXXXX   HLHLHLHLH     HOLD ODD  CHECKERBOARD
 H X X   XXXXXXXXX   ZZZZZZZZZ     TEST HI-Z
----------------------------------------------------------
 
 
DESCRIPTION
 
THIS 9-BIT REGISTER LOADS THE DATA (D8-D0) ON THE RISING EDGE OF
THE CLOCK (CLK) IF THE LOAD LINE (/LD) IS ASSERTED (LOW ON PIN 11)
AND OTHERWISE HOLDS THE ORIGINAL VALUE.

THE 9-BIT ARCHITECTURE MAKES THIS REGISTER IDEAL FOR PARITY BUS
INTERFACING IN MICROPROGRAMMED SYSTEMS.

THESE OPERATIONS ARE EXERCISED IN THE FUNCTION TABLE AND SUMMARIZED
IN OPERATIONS TABLE:

      /OC  CLK  /LD  D8-D0  Q8-Q0    OPERATION
      -----------------------------------------
       H    X    X     X      Z      HI-Z
       L    C    H     X      Q      HOLD
       L    C    L     D      D      LOAD
      -----------------------------------------