ECEN248 Lab 5

ECEN248 Lab 5 - Lab 5: 8-bit Counters Derek W. Johnson ECEN...

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Unformatted text preview: Lab 5: 8-bit Counters Derek W. Johnson ECEN 248-506 Aaron Hill February 29, 2008 Objectives This lab will increase the students understanding of counters and clocks. The lab will explore the differences between a debounced clock and a non-debounced clock. The student will also design a function for writing a binary number to a digital display. Design 1. The 7-Segment Display In order to write an 8-bit binary number to a digital display (in hexadecimal form), the number must be divided into two 4-bit numbers. Each number will output to its own digital display. Thus, a system of equations needs to be designed to convert a 4-bit number to the proper hexadecimal digit. The first step in designing such a device is to write out the truth table. Notice that a segment lights up when its signal goes low. Table 1: 7-Segment Display Truth Table X 3 X 2 X 1 X A B C D E F G 1 1 1 1 1 1 1 1 1 2 1 1 1 1 3 1 1 1 4 1 1 1 1 1 5 1 1 1 1 6 1 1 1 1 7 1 1 1 1 1 8 1 1 9 1 1 1 1 A 1 1 1 1 b 1 1 1 1 C 1 1 1 1 1 1 d 1 1 1 1 1 E 1 1 1 1 1 1 F 1 1 1 Figure 1: 7-Segment Display Layout B C F E A G D The logic equations for each segment can be found by creating Karnaugh maps. Table 2: K-map for A X 3 X 2 X 1 X 1 1 1 10 00 1 01 1 1 11 1 10 A = /X 3 *X 2 */X 1 */X + /X 3 */X 2 */X 1 *X + X 3 *X 2 */X 1 *X + X 3 */X 2 *X 1 *X . Table 3: K-map for B X 3 X 2 X 1 X 1 1 1 10 00 1 01 1 11 1 1 10 1 1 B = X 3 *X 1 *X + X 3 *X 2 */X + X 2 *X 1 */X + /X 3 *X 2 */X 1 *X ....
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ECEN248 Lab 5 - Lab 5: 8-bit Counters Derek W. Johnson ECEN...

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