ALU 1-Bit - Ale

184

01:45:16

From Tanenbaum.
This is 1-bit ALU. Connecting N of these you can obtain a N-Bit ALU.

Component:

OUTPUT (At right top)
the lamp that is the output(0 or 1).

CONTROLLER (At left bottom)
you can see a DECODER used for controll off/on means AND.
The specific function selected give the output.

LOGIC UNIT (On top left)
input(top-down) value 0-1
INVERT A
A
ENABLE-A
B
ENABLE-B

Bolean function(INVERT A off 0):

1) AB (Logic AND) - Decoder: 00(read top-down)  

2) A + B (Logic OR) - Decoder: 01(read top-down) 

3) NOT B - Decoder: 10(read top-down)

Variant with INVERT A on 1
(NOT A) x B
(NOT A) + B

ADDER(At right bottom)
Decoder: 11(read top-down) 
the adder with is rest lamp(on bottom) and over there there is the input of another ipotetical ALU rest.

published 10 years ago

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