PAL DESIGN SPECIFICATION
PAT001  KEVIN M. OW-WING 6-22-85
4-BIT SLICE FOR AN 8 BIT BARREL SHIFTER
ADVANCED MICRO DEVICES

modified by SMS to demonstrate the output enable function

device 16r4;

CK        1
D7        2
D6        3
D5        4
D4        5
D3        6
D2        7
D1        8
D0        9
GND       10
/E        11
/EQZERO   12
S0        13
Q0        14
Q1        15
Q2        16
Q3        17
S1        18
S2        19
VCC       20

macro  f0  /S2*/S1*/S0;
macro  f1  /S2*/S1* S0;
macro  f2  /S2* S1*/S0;
macro  f3  /S2* S1* S0;
macro  f4   S2*/S1*/S0;
macro  f5   S2*/S1* S0;
macro  f6   S2* S1*/S0;
macro  f7   S2* S1* S0;

start

Q3 /:= &f0*/D3 +  &f1*/D2 + &f2*/D1 + &f3*/D0 +
       &f4*/D7 +  &f5*/D6 + &f6*/D5 + &f7*/D4;

Q2 /:= &f0*/D2 +  &f1*/D1 + &f2*/D0 + &f3*/D7 +
       &f4*/D6 +  &f5*/D5 + &f6*/D4 + &f7*/D3;

Q1 /:= &f0*/D1 +  &f1*/D0 + &f2*/D7 + &f3*/D6 +
       &f4*/D5 +  &f5*/D4 + &f6*/D3 + &f7*/D2;

Q0 /:= &f0*/D0 +  &f1*/D7 + &f2*/D6 + &f3*/D5 +
       &f4*/D4 +  &f5*/D3 + &f6*/D2 + &f7*/D1;

/EQZERO.ENA    =  /S0*/S1*/S2;
/EQZERO       /=  /D0*/D1*/D2*/D3*/D4*/D5*/D6*/D7;


end