Digital Systems Laboratory - Eskişehir Osmangazi Üniversitesi
Digital Systems Laboratory - Eskişehir Osmangazi Üniversitesi
Digital Systems Laboratory - Eskişehir Osmangazi Üniversitesi
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. For only the output “a”, obtain a minimum logic function. Realize this function using NAND gates andinverters only. For example if decimal 9 is to be displayed a, b, c, d, f, g must be 0 and the others must be1 (For common anode type display units), if decimal 5 is to be displayed then a, f, g, c, d must be 0 andthe others must be 1.Procedure:1. Gray code to Binary converter:Gray code is one of the codes used in digital systems. It has the advantage over binary numbers that onlyone bit in the code word changes when going from one number to the next. (See Table 2). Construct thecircuit (PreLab Q.1) and verify its operations.Table 6Fig. 15 XOR chip 7486Decimal Gray Binary0 0000 00001 0001 00012 0011 00103 0010 00114 0110 01005 0111 01016 0101 01107 0100 01118 1100 10009 1101 100110 1111 101011 1110 101112 1010 110013 1011 110114 1001 111015 1000 1111.2. BCD-to-seven Segment converter:A light emitting Diode (LED) is a PN junction diode. When the diode is forward biased, a current flowsthrough the junction and the light is emitted. See Fig.16.Fig. 16A seven segment LED display contains 7 LEDs. Each LED is called a segment and they are identified as(a, b, c, d, e, f, g) segments Fig.17.18