EC > GATE 2016 SET-2 > 8085 Microprocessor
An 8 Kbyte ROM with an active low Chip Select input (CS) is to be used in an 8085 microprocessor based system. The ROM should occupy the address range 1000H to 2FFFH. The address lines are designated as A15 to A0, where A15 is the most significant address bit. Which one of the following logic expressions will generate the correct CS signal for this ROM?
A
A15+A14+(A13·A12+A13·A12)
B
A15·A14·(A13+A12)
C
A15̄·A14̄·(A13·A12̄+A13̄·A12)
D
A15̄+A14̄+A13·A12

Correct : a

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