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Electronic Labs_95

Electronic Labs_95 - GATE 1 INPUTS 0 1 0 0 1 1 1 0 GATE 2...

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Unformatted text preview: GATE 1 INPUTS 0 1 0 0 1 1 1 0 GATE 2 INPUTS INPUTS >| co > GATE 3 INPUTS GATE 1 OUTPUT Exclusive-OR/NOR Gates; Parity Circuits 7-3 ATE 3 OU—PUT or AEBB AA+ 0 1 1 1 0 0 1 0 0 0 1 Table 7-1 creased for this circuit, the output will be HI only when an odd number of bits are HI. The EXCLUSIVE-NOR gate is identical to the EX- CLUSIVE-OR gate except that the output is inverted. Fig. 7-4 shows the basic gate circuit where the output gate performs the NOR operation. Table 7- 1 also shows the output Y for this circuit as A—eB—B which is the complement of AeBB. The EXCLUSIVE-NOR gate can also have any number of input bits. If the number of inputs is increased for this circuit, the output will be HI only when an even number of input bits are identical. Exercise Procedure Cl 1. a) Connect the EXCLUSIVE-OR gate cir- cuit shown in Fig. 7-3 (b) using the switches for inputs, 7400 NAND gates, and the LED Display for the output. D b) Turn on the trainer power. I] c)Complete Table 7-2 for all input com- binations. INPUTS OUTPUT Table 7-2 The completed truth table should indicate the operation of the EXCLUSIVE-OR function that can be verified by Table 7-1. Note that the output Yis 1 only when an odd number of input bits are 1. D 2. a) Turn off the trainer power and connect the EXCLUSIVE-NOR gate circuit shown in Fig. 7-4 (a). Use two 7404 Inverter gates, the Two Wide 2-input AND/OR/INVERT gate 7451, the Switches and the LED Display. E] b) Turn on the trainer power. [1 c)Complete Table 7-3 for all input com- binations. OUTPUT INPUTS Table 7-3 The completed truth table should indicate the operation of the EXCLUSIVE-NOR function that can be verified by Table 7-]. Note that the output Y is 1 when an even number of input bits are identical. Objective B. Demonstrate and verify the opera- tion of a parity-bit generator circuit. Preparatory Information. EXCLUSIVE-OR and EXCLUSIVE-NOR gates find wide application in computers and data transmission systems. Binary words are often checked as they are sent from one point to another in the system to see that an error has not been introduced due to noise or equipment failure. This is most usually done using a parity-bit system. A parity bit is an extra bit that is added to a data word and is used for checking errors. Both even and odd parity systems are used. In the even parity method, a 1-bit is added to the data word if the number of l-bits in the word is odd. In the odd parity method, the 1-bit is added if an even number of 1-bits exist in the data word. ...
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