Question about logic functions

3. Each of three coins has two sides, heads and tails. Represent the heads or tails status of each coin by a logical variable (A for the first coin, B for the second coin and C for the third) where the logical variable is 1 for heads and 0 for tails. Write a logic function F (A, B, C) which is 1 iff exactly one of the coins is heads after a toss of the coins.

a) Get truth table for F

b) Express F as a minterm expansion

c) Express F as a maxterm expansion

Implement the following multiple output combinational logic circuit using a 4 line to

16-line decoder: F1= ∑m (0, 1, 4, 7, 12, 14, 15) F3= ∑m (2, 3, 7, 8, 10)

 F2= ∑m (1, 3, 6, 9, 12) F4= ∑m (1, 3, 5)

In this stage, you will review the physical connections and operation of RS-232.
1. List the name of each signal/pin of a 9-pin RS-232 connector.
2. List the purpose of each signal/pin you listed in (1).
3. Identify the voltages that represent each logic level for all the signals you listed in (1).
4. Describe the sequence of signals asserted when a Data Terminal Equipment (DTE)
wants to send data to a Data Communication Equipment (DCE). Clearly indicate the
direction of each signal.