# exam2_f06 - ECE 290 Brown/Wah Test 2 Fall 2006 Page 1 of 11...

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ECE 290 Test 2 Fall 2006 Brown/Wah Page 2 of 11 Problem 1 (16%) a) Consider the three registers shown below (8%): load 4 R1 Q D 4 load 4 R2 Q D 4 load 4 R3 Q D 4 S 4 Mux 1 4 0 4 We want to be able to satisfy the following four commands by designing some dedicated buses that are controlled by the multiplexer in the diagram: 13 kk : R2 R1 : R1 R3 2 k : R3 R1 23 : R3 R2 Connect the appropriate wires representing the dedicated buses and fill in the logic equations for “S” for the multiplexer and “load” for the registers. You may use notations like “ 1 3 + ” in your answer instead of logic gates. You do not need any other components beyond the ones shown in the figure.
ECE 290 Test 2 Fall 2006 Brown/Wah Page 3 of 11 Problem 1 (cont’d) b) Consider the three registers connected by a single shared bus shown below (4%): The following four commands shown in part (a) can no longer be satisfied using a single shared bus: 13 kk : R2 R1 : R1 R3 2 k : R3 R1 23 : R3 R2 Give one possible combination of the control signals that would cause a conflict (simultaneous transfers) in using the shared bus. 123 ,, kkk 1 k = _______________ = _______________ = ________________ 2 k 3 k c) The best we can do to avoid such conflicts in the shared bus is to implement three of four transfer operations. Cross out one of the transfer operations above so that the remaining three can be implemented without conflicts using the single shared bus.

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## This note was uploaded on 06/21/2011 for the course ECE 290 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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exam2_f06 - ECE 290 Brown/Wah Test 2 Fall 2006 Page 1 of 11...

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