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- PAL14L8 PAL DESIGN SPECIFICATION
- U1 Bob Metzler 12/30/90
- DUAL 4:1 MULTIPLEXER
- MYTEST REDMOND,WASHINGTON
- A1 B1 C1 D1 X1 NC X2 A2 B2 C2 D2 GND
- NC NC Y2 NC NC NC NC NC NC Y1 NC VCC
- ;pinlist 1 to 24 must start in line 5
-
- ;equations go here
-
- /Y1 = /X1*/X2 * /A1
- + /X1* X2 * /B1
- + X1*/X2 * /C1
- + X1* X2 * /D1
-
- /Y2 = /X1*/X2 * /A2
- + /X1* X2 * /B2
- + X1*/X2 * /C2
- + X1* X2 * /D2
-
- ; function table vectors go here
-
- FUNCTION TABLE
- D1 C1 B1 A1 D2 C2 B2 A2 X2 X1 Y1 Y2
-
- ;function table pin list
- ; INPUTS CONTROL OUTPUTS
- ; D C B A D C B A X X Y Y
- ; 1 1 1 1 2 2 2 2 2 1 1 2
- ---------------------------------------------------------
- ;check for high outputs
- H H H H H H H H L L H H
- H H H H H H H H H L H H
- H H H H H H H H L H H H
- H H H H H H H H H H H H
- ;check for low outputs on Y1
- H H H L H H H H L L L H
- H H L H H H H H H L L H
- H L H H H H H H L H L H
- L H H H H H H H H H L H
- ;check for low outputs on Y2
- H H H H H H H L L L H L
- H H H H H H L H H L H L
- H H H H H L H H L H H L
- H H H H L H H H H H H L
- ---------------------------------------------------------
- DESCRIPTION
- This example uses a PAL14L8 as a dual 4:1 multiplexer. The select lines
- (X1,X2) along with one of the 4 inputs (A,B,C,D) will drive the output
- (Y) low. If no inputs are low the outputs are high.
-