If the ROM in the hexadecimal to ASCII code
9.10Â (a) Ifthe ROM in the hexadecimal to ASCII code converter of Figure 9-22 is replaced with a PAL, give the internal connection diagram.
(b) Ifthe same ROM is replaced with a PLA, give the PLA table.
9.11 (a) Sometimes the programmable MUX (1) in Figure  9-31 helps us to save AND gates. Consider the case in which F  = c'd ' + be' + a'c. If programmable MUX (1) is not set to invert F (i.e., G = F), how many AND gates are needed? If the MUX is set to invert F (i.e., G = F'), how many AND gates are needed?
(b) Repeat (a) for F = a'b' + c'd '.
9.12 (a) Implement a 3-variable function generator using a PAL with inputs a, b, c, and 1 (use the input inverter to get o also). Give the internal connection diagram.Leave the connections to o and 1disconnected, so that any 3-variable function can be implemented by connecting only o and 1.
(c)Â Â Now connect o and 1so that the function generator implements the sum function for a full adder. See Figure 9-34.
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Posted 29 Apr 2017 06:04 AM
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