Suppose that a bus as shown in Fig.2.78 is given. Rectangles containing an & sign denote AND-gates. Which of the IEEE 1164 values will be on the bus if both enable inputs are set to ’ 0’ (ena1 = ena2 = ’ 0’)? Which of the IEEE 1164 values will be on the bus if ena1=’ 0’, ena2 =’ 1’, and f2 =’ 1’?

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VDD f1 & PU1 PU2H f2 & bus ena 1 & PD1 Fig. 2.78 Bus driven by tristate outputs GROUND -ena2 PD2 & f2