2. Build the circuit shown below. The Data and Control inputs shown are connected back to input switches on the trainer. The output is connected to a LED. Design the control circuit using other logic gates to "address" the control lines on the Tri-state buffers.

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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1.
Design a bus control circuit similar to the multiplexer where 4 inputs can use the same
output line. We wish to design the circuit so that only one input at any given time has
access to the output. To do this we can design a decoder circuit to control the tri-state
buffers on each input line.
If we are using 74126's, this means that at any one time the input to 3 of the tri-state
buffers must be LOW to shut down those gates, and one buffer must be HIGH to allow
the input to pass to the output. If we use 74125's then we must reverse these conditions.
2.
Build the circuit shown below. The Data and Control inputs shown are connected back
to input switches on the trainer. The output is connected to a LED. Design the control
circuit using other logic gates to "address" the control lines on the Tri-state buffers.
Control 1
Control 2
LED
Output
Data 1
Data 2
Data 3
Data 4
Transcribed Image Text:1. Design a bus control circuit similar to the multiplexer where 4 inputs can use the same output line. We wish to design the circuit so that only one input at any given time has access to the output. To do this we can design a decoder circuit to control the tri-state buffers on each input line. If we are using 74126's, this means that at any one time the input to 3 of the tri-state buffers must be LOW to shut down those gates, and one buffer must be HIGH to allow the input to pass to the output. If we use 74125's then we must reverse these conditions. 2. Build the circuit shown below. The Data and Control inputs shown are connected back to input switches on the trainer. The output is connected to a LED. Design the control circuit using other logic gates to "address" the control lines on the Tri-state buffers. Control 1 Control 2 LED Output Data 1 Data 2 Data 3 Data 4
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