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- PAL20L2 PAL DESIGN SPECIFICATION
- 74LS451 BIRKNER/KAZMI/BLASCO 03/10/81
- DUAL 8:1 MULTIPLEXER
- MMI SUNNYVALE, CALIFORNIA
- 1D0 1D1 1D2 1D3 1D4 1D5 1D6 1D7 2D0 2D1 2D2 GND
- 2D3 2D4 2D5 2D6 2D7 2Y 1Y S C B A VCC
-
- ;equations go here
-
- /1Y = /S*/C*/B*/A * /1D0 ;SELECT INPUT 1D0
- + /S*/C*/B* A * /1D1 ;SELECT INPUT 1D1
- + /S*/C* B*/A * /1D2 ;SELECT INPUT 1D2
- + /S*/C* B* A * /1D3 ;SELECT INPUT 1D3
- + /S* C*/B*/A * /1D4 ;SELECT INPUT 1D4
- + /S* C*/B* A * /1D5 ;SELECT INPUT 1D5
- + /S* C* B*/A * /1D6 ;SELECT INPUT 1D6
- + /S* C* B* A * /1D7 ;SELECT INPUT 1D7
-
- /2Y = /S*/C*/B*/A * /2D0 ;SELECT INPUT 2D0
- + /S*/C*/B* A * /2D1 ;SELECT INPUT 2D1
- + /S*/C* B*/A * /2D2 ;SELECT INPUT 2D2
- + /S*/C* B* A * /2D3 ;SELECT INPUT 2D3
- + /S* C*/B*/A * /2D4 ;SELECT INPUT 2D4
- + /S* C*/B* A * /2D5 ;SELECT INPUT 2D5
- + /S* C* B*/A * /2D6 ;SELECT INPUT 2D6
- + /S* C* B* A * /2D7 ;SELECT INPUT 2D7
-
- FUNCTION TABLE
-
- C B A 1D0 1D1 1D2 1D3 1D4 1D5 1D6 1D7 2D0 2D1 2D2 2D3 2D4 2D5 2D6 2D7 S 1Y 2Y
-
- ; SEL --------INPUTS-------- --OUTPUTS-- COMMENTS
- ; 1D- 2D-
- ; C B A 01234567 01234567 S 1Y 2Y
- -------------------------------------------------------------------------
- L L L LHHHHHHH LHHHHHHH L L L 1D0 = 0 2D0 = 0
- L L L HLLLLLLL LHHHHHHH L H L 1D0 = 1 2D0 = 0
- L L L LHHHHHHH HLLLLLLL L L H 1D0 = 0 2D0 = 1
- L L L HLLLLLLL HLLLLLLL L H H 1D0 = 1 2D0 = 1
- L L L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- L L H HLHHHHHH HLHHHHHH L L L 1D1 = 0 2D1 = 0
- L L H LHLLLLLL HLHHHHHH L H L 1D1 = 1 2D1 = 0
- L L H HLHHHHHH LHLLLLLL L L H 1D1 = 0 2D1 = 1
- L L H LHLLLLLL LHLLLLLL L H H 1D1 = 1 2D1 = 1
- L L H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- L H L HHLHHHHH HHLHHHHH L L L 1D2 = 0 2D2 = 0
- L H L LLHLLLLL HHLHHHHH L H L 1D2 = 1 2D2 = 0
- L H L HHLHHHHH LLHLLLLL L L H 1D2 = 0 2D2 = 1
- L H L LLHLLLLL LLHLLLLL L H H 1D2 = 1 2D2 = 1
- L H L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- L H H HHHLHHHH HHHLHHHH L L L 1D3 = 0 2D3 = 0
- L H H LLLHLLLL HHHLHHHH L H L 1D3 = 1 2D3 = 0
- L H H HHHLHHHH LLLHLLLL L L H 1D3 = 0 2D3 = 1
- L H H LLLHLLLL LLLHLLLL L H H 1D3 = 1 2D3 = 1
- L H H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- H L L HHHHLHHH HHHHLHHH L L L 1D4 = 0 2D4 = 0
- H L L LLLLHLLL HHHHLHHH L H L 1D4 = 1 2D4 = 0
- H L L HHHHLHHH LLLLHLLL L L H 1D4 = 0 2D4 = 1
- H L L LLLLHLLL LLLLHLLL L H H 1D4 = 1 2D4 = 1
- H L L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- H L H HHHHHLHH HHHHHLHH L L L 1D5 = 0 2D5 = 0
- H L H LLLLLHLL HHHHHLHH L H L 1D5 = 1 2D5 = 0
- H L H HHHHHLHH LLLLLHLL L L H 1D5 = 0 2D5 = 1
- H L H LLLLLHLL LLLLLHLL L H H 1D5 = 1 2D5 = 1
- H L H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- H H L HHHHHHLH HHHHHHLH L L L 1D6 = 0 2D6 = 0
- H H L LLLLLLHL HHHHHHLH L H L 1D6 = 1 2D6 = 0
- H H L HHHHHHLH LLLLLLHL L L H 1D6 = 0 2D6 = 1
- H H L LLLLLLHL LLLLLLHL L H H 1D6 = 1 2D6 = 1
- H H L HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- H H H HHHHHHHL HHHHHHHL L L L 1D7 = 0 2D7 = 0
- H H H LLLLLLLH HHHHHHHL L H L 1D7 = 1 2D7 = 0
- H H H HHHHHHHL LLLLLLLH L L H 1D7 = 0 2D7 = 1
- H H H LLLLLLLH LLLLLLLH L H H 1D7 = 1 2D7 = 1
- H H H HHHHHHHH HHHHHHHH L H H TOGGLE OTHER LINES
- -------------------------------------------------------------------------
-
- DESCRIPTION
- This is an example of a Dual 8-to-1 Multiplexer using a PAL20L2. A strobe
- line (S) is provided to gate the outputs off (Y=H) when the strobe is high.
- The select lines A,B,C are encoded in binary, with A representing the LSB.
-
- OPERATIONS TABLE:
-
- INPUTS OUTPUTS
- SELECT STB
- C B A S Y
- -------------------
- X X X H H
- L L L L D0
- L L H L D1
- L H L L D2
- L H H L D3
- H L L L D4
- H L H L D5
- H H L L D6
- H H H L D7
- -------------------
-