Computer Platforms Research Paper Example | Topics and Well Written Essays - 1250 words

Computer Platforms - Research Paper ExampleA double star star input of 0100 would light four LEDs in a line whilst a binary input of 0101 would light five LEDs in a actors line. Derive the truth-table for a 4 bit input/ 16 bit getup decoder which would be used to power this linear display.Solution Let x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14 and x15 represent the linear array of LEDs. Let A, B, C and D represent the binary input terminals. The truth-table for the linear display is shown in Figure 2.2.... Table 2.1 gives details as to which segments should be energised to display various decimal values at the 4-pin input. ten-foldABCDSegments00000a, b, c, d, e, f10001b, c20010a, b, g, e, d30011a, b, c, d, g40100b, c, f, g50101a, c, d, f, g60110c, d, e, f, g70111a, b, c81000a, b, c, d, e, f, g91001a, b, c, f, gTable 2.1 Truth-table for BCD-to-seven-segment decoderHence we can derive expressions for each segment, as followsa = ABCD + ABCD + ABCD + ABCD + ABCD + A BCD + ABCDb = ABCD + ABCD + ABCD + ABCD + ABCD + ABCD + ABCD + ABCDc = ABCD + ABCD + ABCD + ABCD + ABCD + ABCD + ABCD + ABCD + ABCDd = ABCD + ABCD + ABCD + ABCD + ABCD + ABCDe = ABCD + ABCD + ABCD + ABCDf = ABCD + ABCD + ABCD + ABCD + ABCD + ABCDg = ABCD + ABCD + ABCD + ABCD + ABCD + ABCD + ABCD2.b A display composed of a linear array of LEDs, is to respond to a 4-bit binary input which is dependent on the absolute binary value by lighting each successful element. A binary input of 0100 would light four LEDs in a row whilst a binary input of 0101 would light five LEDs in a row. Derive the truth-table for a 4 bit input/ 16 bit rig decoder which would be used to power this linear display.Solution Let x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14 and x15 represent the linear array of LEDs. Let A, B, C and D represent the binary input terminals. The truth-table for the linear display is shown in Figure 2.2.Table 2.2 Truth-table for LEDs of linear display 3.a The decimal n umber 101 may be represented in binary as 01100101. Using Ones