Title 1

Title 1

Multiplexor Plexers 1 A multiplexor is a device that takes a number of data inputs and selects one of them to pass through as its output. The interface of a multiplexor provides means to control which data input value is selected. If there are K data input signals, then at least log K bits are needed to specify which input signal is to be passed through. So, in most cases, multiplexors take 2n data input signals and n control signals. [email protected] August 2009 Computer Organization I 2006-09 McQuain, Feng & Ribbens Designing a Multiplexor Plexers 2 Consider a 21 x 1 multiplexor; it takes two data inputs D0 and D1 and a single select bit S: D0 D1 S Output 0 0 0 0 0

0 1 0 0 1 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1

1 0 1 1 1 1 1 Output D0 D1 S D0 D1 S D0 D1 S D0 D1 S ( D0 D0 ) D1 S ( D1 D1 ) D0 S D0 S D1 S 2 x 1 multiplexor [email protected] August 2009 Computer Organization I 2006-09 McQuain, Feng & Ribbens A 4x2 Multiplexor Plexers 3 Out I 0 S1 S 0 I1 S1 S0 I 2 S1 S0 I 3 S1 S0 [email protected] August 2009 Computer Organization I 2006-09 McQuain, Feng & Ribbens Decoder Plexers 4

An n x 2n decoder takes n inputs and sets exactly one of its 2n outputs, based upon the pattern of its inputs. 2 x 4 decoder I1 0 0 1 1 I0 0 1 0 1 Out00 1 0 0 0 Out01 0 1 0 0 Out10 0 0 1 0 Out11 0 0 0 1

Out 00 I 0 I1 Out 01 I1 I 0 Out10 I1 I 0 Out11 I 0 I1 [email protected] August 2009 Computer Organization I 2006-09 McQuain, Feng & Ribbens Encoders and Demultiplexors Plexers 5 A 2n x n encoder takes 2n inputs and sets each of its n outputs, based upon the pattern of its inputs. Essentially, an encoder is the inverse of a decoder. 4 x 2 encoder 4 Similarly, a 1 x 2n demultiplexor: It takes 1 input and transmits that input on exactly one of its outputs, determined by the pattern of its n selector bits. 1 x 8 demux 3 [email protected] August 2009 Computer Organization I 2006-09 McQuain, Feng & Ribbens

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