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hw07sol - is HIGH This closes a relay which turns on the...

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SOLUTION 1/2 ECSE-2610 Computer Components and Operations Homework # 07: Four-way switch design Due Wednesday, March 24, 2010 in studio 1. Block diagram of Stair Lights, Switches, and Controller: 125V AC Relay Lights 3 floor switches /3 wires Parity checker Cut-off Master Switch 2. Truth Table: T0 T1 T2 T3 GO 0 X X X 0 1 0 0 0 0 1 0 0 1 1 1 0 1 0 1 1 0 1 1 0 1 1 0 0 1 1 1 0 1 0 1 1 1 0 0 1 1 1 1 1 4. Description Three SPDT switches (T1, T2, T3) are connected to +5V and Ground. The outputs of these switches are connected to an EXLUSIVE NOR (XNOR) gate D00001. Flipping any switch negates the output of the XNOR gate. The output of D00001 is combined with the output of the master switch T0 by means of AND gate D00002. The output of D00002 is connected to terminal GO. When the output of D0001 is LOW and the master switch is HIGH (+5V), the output of D00002, which is connected to terminal GO,
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