PAL14L4                                            PAL DESIGN SPECIFICATION
P7057                                               N.SACHS/V.COLI 10/14/81
4-BIT SERIAL SWITCH
MMI SUNNYVALE, CALIFORNIA
NC S00 S01 D0 D1 D2 D3 S30 S31 GND
S  S21 S20 Y3 Y2 Y1 Y0 S11 S10 VCC


/Y3 =  /S*/D3* S31* S30       ;SWITCH D3 TO OUTPUT Y3 (S3=3)
    +  /S*/D2* S31*/S30       ;SWITCH D2 TO OUTPUT Y3 (S3=2)
    +  /S*/D1*/S31* S30       ;SWITCH D1 TO OUTPUT Y3 (S3=1)
    +  /S*/D0*/S31*/S30       ;SWITCH D0 TO OUTPUT Y3 (S3=0)

/Y2 =  /S*/D3* S21* S20       ;SWITCH D3 TO OUTPUT Y2 (S2=3)
    +  /S*/D2* S21*/S20       ;SWITCH D2 TO OUTPUT Y2 (S2=2)
    +  /S*/D1*/S21* S20       ;SWITCH D1 TO OUTPUT Y2 (S2=1)
    +  /S*/D0*/S21*/S20       ;SWITCH D0 TO OUTPUT Y2 (S2=0)

/Y1 =  /S*/D3* S11* S10       ;SWITCH D3 TO OUTPUT Y1 (S1=3)
    +  /S*/D2* S11*/S10       ;SWITCH D2 TO OUTPUT Y1 (S1=2)
    +  /S*/D1*/S11* S10       ;SWITCH D1 TO OUTPUT Y1 (S1=1)
    +  /S*/D0*/S11*/S10       ;SWITCH D0 TO OUTPUT Y1 (S1=0)

/Y0 =  /S*/D3* S01* S00       ;SWITCH D3 TO OUTPUT Y0 (S0=3)
    +  /S*/D2* S01*/S00       ;SWITCH D2 TO OUTPUT Y0 (S0=2)
    +  /S*/D1*/S01* S00       ;SWITCH D1 TO OUTPUT Y0 (S0=1)
    +  /S*/D0*/S01*/S00       ;SWITCH D0 TO OUTPUT Y0 (S0=0)


FUNCTION TABLE

S S31 S30 S21 S20 S11 S10 S01 S00 D3 D2 D1 D0 Y3 Y2 Y1 Y0

;   SWITCH CONTROL   INPUTS   OUTPUTS
;     S3 S2 S1 S0     DDDD     YYYY
;S    10 10 10 10     3210     3210       COMMENTS
---------------------------------------------------------------------
 L    HH HL LH LL     LHLH     LHLH       D3=Y3, D2=Y2, D1=Y1, D0=Y0
 L    LL LH HL HH     LHLH     HLHL       D3=Y0, D2=Y1, D1=Y2, D0=Y3
 L    LL HL LH HH     LHLH     HHLL       D3=Y0, D2=Y2, D1=Y1, D0=Y3
 L    LL LH HL HH     LHLH     HLHL       D3=Y3, D2=Y1, D1=Y2, D0=Y0
 L    LL LL HH HH     HHLL     LLHH       D3=Y1,Y0  D0=Y3,Y2
 L    LL HH HH HH     HLLL     LHHH       D3=Y2,Y1,Y0  D0=Y3
 L    LL LL LL LL     HHHL     LLLL       D0=Y3,Y2,Y1,Y0
 L    LH LH LH LH     HHLH     LLLL       D1=Y3,Y2,Y1,Y0
 L    HL HL HL HL     HLHH     LLLL       D2=Y3,Y2,Y1,Y0
 L    HH HH HH HH     LHHH     LLLL       D3=Y3,Y2,Y1,Y0
 L    LL LL LL LL     LLLH     HHHH       D0=Y3,Y2,Y1,Y0
 L    LH LH LH LH     LLHL     HHHH       D1=Y3,Y2,Y1,Y0
 L    HL HL HL HL     LHLL     HHHH       D2=Y3,Y2,Y1,Y0
 L    HH HH HH HH     HLLL     HHHH       D3=Y3,Y2,Y1,Y0
 H    XX XX XX XX     LLLL     HHHH       TEST STROBE WITH D=L
 H    XX XX XX XX     HHHH     HHHH       TEST STROBE WITH D=H
---------------------------------------------------------------------


DESCRIPTION

THIS IS A 4-BIT SERIAL SWITCH WHICH CONNECTS ANY INPUT (D) TO ANY OR ALL
OUTPUTS (Y) IN ANY COMBINATION.  A STROBE LINE (S) IS PROVIDED TO GATE
THE OUTPUTS OFF (Y=H) WHEN THE STROBE INPUT IS HIGH.  THE SWITCH LINES
(S3-0) ARE ENCODED IN BINARY WITH S-0 REPRESENTING THE LSB.