Suppose you had a computer system with four interrupting devices, P1 to P4, where P1 has the highest priority and P4 the lowest. Design a logic unit with four interrupt request inputs, P1 to P4, and four interrupt request outputs, I1 to I4. The logic should convert any combination of inputs on P1 to P4 into a single request on I1 to I4 that reflects the highest priority input. For example, if P1 and P3 are asserted, output I1 is asserted and I2 to I4 are not asserted. Assume positive logic (i.e., the request level is 1).
What will be an ideal response?
We can implement the logic as either a simple look up table in a read?only memory or by using combinational logic. For example, I1 = P1, I2 = P1*.P2, I3 = P1*.P2*.P3, and I4 = P1*.P2*.P3*.P4
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