PAL16L8                                          PAL DESIGN SPECIFICATION
P7047                                                 B. BRAFMAN 03/13/81
ERROR CORRECTION UNIT #1
MMI FIELD APPLICATIONS ENGINEER YORBA LINDA, CALIFORNIA
/S3 /S2 /S1 /S0 B7  B6  B5  B4  B3  GND
 B2  NC  NC B2C B3C B4C B5C B6C B7C VCC


IF (VCC) /B7C =  S3* S2*/S1*/S0* B7      ;CORRECTION OF B7
              + /S3*/B7                  ;NO CORRECTION
              + /S2*/B7                  ;NO CORRECTION
              +  S1*/B7                  ;NO CORRECTION
              +  S0*/B7                  ;NO CORRECTION

IF (VCC) /B6C =  S3*/S2* S1* S0* B6      ;CORRECTION OF B6
              + /S3*/B6                  ;NO CORRECTION
              +  S2*/B6                  ;NO CORRECTION
              + /S1*/B6                  ;NO CORRECTION
              + /S0*/B6                  ;NO CORRECTION

IF (VCC) /B5C =  S3*/S2* S1*/S0* B5      ;CORRECTION OF B5
              + /S3*/B5                  ;NO CORRECTION
              +  S2*/B5                  ;NO CORRECTION
              + /S1*/B5                  ;NO CORRECTION
              +  S0*/B5                  ;NO CORRECTION

IF (VCC) /B4C =  S3*/S2*/S1* S0* B4      ;CORRECTION OF B4
              + /S3*/B4                  ;NO CORRECTION
              +  S2*/B4                  ;NO CORRECTION
              +  S1*/B4                  ;NO CORRECTION
              + /S0*/B4                  ;NO CORRECTION

IF (VCC) /B3C = /S3* S2* S1* S0* B3      ;CORRECTION OF B3
              +  S3*/B3                  ;NO CORRECTION
              + /S2*/B3                  ;NO CORRECTION
              + /S1*/B3                  ;NO CORRECTION
              + /S0*/B3                  ;NO CORRECTION

IF (VCC) /B2C = /S3* S2* S1*/S0* B2      ;CORRECTION OF B2
              +  S3*/B2                  ;NO CORRECTION
              + /S2*/B2                  ;NO CORRECTION
              + /S1*/B2                  ;NO CORRECTION
              +  S0*/B2                  ;NO CORRECTION


FUNCTION TABLE

S3 S2 S1 S0 B7 B6 B5 B4 B3 B2 B7C B6C B5C B4C B3C B2C

;SYNDROME    INPUT     CORRECTED
;  SSSS      BBBBBB     BBBBBB
;  3210      765432     765432        COMMENTS
------------------------------------------------
   LLLL      HHHHHH     HHHHHH        NO ERROR
   LLLL      LLLLLL     LLLLLL        NO ERROR
   HHLL      HHHHHH     LHHHHH        CORRECT B7
   HHLL      LLLLLL     HLLLLL        CORRECT B7
   HLHH      HHHHHH     HLHHHH        CORRECT B6
   HLHH      LLLLLL     LHLLLL        CORRECT B6
   HLHL      HHHHHH     HHLHHH        CORRECT B5
   HLHL      LLLLLL     LLHLLL        CORRECT B5
   HLLH      HHHHHH     HHHLHH        CORRECT B4
   HLLH      LLLLLL     LLLHLL        CORRECT B4
   LHHH      HHHHHH     HHHHLH        CORRECT B3
   LHHH      LLLLLL     LLLLHL        CORRECT B3
   LHHL      HHHHHH     HHHHHL        CORRECT B2
   LHHL      LLLLLL     LLLLLH        CORRECT B2
------------------------------------------------


DESCRIPTION

THIS PAL PERFORMS ERROR CORRECTION ON BITS B2-B7 BASED ON THE 4-BIT
ERROR SYNDROME S0-S3.