Lecture06 - Announcements ECE 2300 Introduction to Digital...

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Lecture 6: Spring 2010 1 ECE 2300 Introduction to Digital Logic Design More Logic Functions Lecture 6: 2 • HW 3 is on Blackboard Announcements Lecture 6: Buses • Buses provide a communication channel among multiple nodes • Components – Set of wires connecting all the nodes – Special circuits for sending and receiving bus data – Control logic that decides who is allowed to send 3 Control Logic Node0 Node1 Node2 Node3 Lecture 6: 4 EN A OUT 0 0 1 1 0 1 0 1 Hi-Z Hi-Z 0 1 Tri-State Drivers • Along with 0 and 1, there is a third Hi-Z state – Output “floats” so line can be driven by another gate • Used to drive a bus – Only one node drives the bus, others in Hi-Z state Lecture 6: 5 V CC OUT E N A B C D Q1 Q2 OUT L L H H L off off Hi-Z L H H H L off off Hi-Z H L L H H on off L H H L L L off on H EN A B D C Tri-State Drivers Q1 Q2 Lecture 6: 6 Variations of Tri-State Drivers Lecture 6: 7 Example Tri-State Driver Lecture 6: 8 Bus Driver Application Lecture 6: 9 Tri-State Transceiver Data can flow in either direction A,B Hi Z X 1 A ! B 1 0 A " B 0 0 Action DIR G
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Lecture 6:10 Transceiver Application Coupling two busses Lecture 6:11 • Same as an OR gate, except when inputs are 1 • Used for comparisons, error checking • XNOR: complemented version of XOR X Y X ! Y (X ! Y)’ 0 0 0 1 0 1 1 0 1 0 1 0 1 1 0 1
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This note was uploaded on 04/10/2010 for the course ECE 2300 taught by Professor Long during the Spring '08 term at Cornell University (Engineering School).

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Lecture06 - Announcements ECE 2300 Introduction to Digital...

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