PAL16C1                                                PAL DESIGN SPECIFICATION
P7091                                                     VINCENT COLI 11/13/82
16 INPUT PRIORITY ENCODER INTERRUPT FLAG (CHIP No. 2)
MMI SUNNYVALE, CALIFORNIA
I0 I1  I2  I3    I4      I5    I6  I7  I8  GND
I9 I10 I11 I12 POS_INT NEG_INT I13 I14 I15 VCC


NEG_INT = /I0*/I1*/I2*/I3*/I4*/I5*/I6*/I7*/I8*/I9*/I10*/I11*/I12*/I13*/I14*/I15


FUNCTION TABLE

I15 I14 I13 I12 I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0 NEG_INT POS_INT

; SIXTEEN INPUTS    INTERRUPT
;111111               FLAG
;5432109876543210    NEG POS     COMMENTS
------------------------------------------------------------------------
 XXXXXXXXXXXXXXXH     L   H      I0  INTERRUPT (HIGHEST PRIORITY INPUT)
 XXXXXXXXXXXXXXHL     L   H      I1  INTERRUPT
 XXXXXXXXXXXXXHLL     L   H      I2  INTERRUPT
 XXXXXXXXXXXXHLLL     L   H      I3  INTERRUPT
 XXXXXXXXXXXHLLLL     L   H      I4  INTERRUPT
 XXXXXXXXXXHLLLLL     L   H      I5  INTERRUPT
 XXXXXXXXXHLLLLLL     L   H      I6  INTERRUPT
 XXXXXXXXHLLLLLLL     L   H      I7  INTERRUPT
 XXXXXXXHLLLLLLLL     L   H      I8  INTERRUPT
 XXXXXXHLLLLLLLLL     L   H      I9  INTERRUPT
 XXXXXHLLLLLLLLLL     L   H      I10 INTERRUPT
 XXXXHLLLLLLLLLLL     L   H      I11 INTERRUPT
 XXXHLLLLLLLLLLLL     L   H      I12 INTERRUPT
 XXHLLLLLLLLLLLLL     L   H      I13 INTERRUPT
 XHLLLLLLLLLLLLLL     L   H      I14 INTERRUPT
 HLLLLLLLLLLLLLLL     L   H      I15 INTERRUPT (LOWEST PRIORITY INPUT)
 LLLLLLLLLLLLLLLL     H   L      NO  INTERRUPT INPUT
------------------------------------------------------------------------


DESCRIPTION

THE 16 INPUT PRIORITY ENCODER INTERRUPT FLAG ACCEPTS SIXTEEN ACTIVE-LOW INPUTS
(I0-I15) IN ORDER TO GENERATE AN ACTIVE LOW (NEG_INT) AND ACTIVE HIGH (POS_INT)
INTERRUPT FLAG.

UP TO FOUR INTERRUPT ENABLE PINS OF ANY POLARITY CAN BE ADDED IF A PAL20C1 IS
SUBSTITUTED.