1 pointIn an 8085 system, CS = A15A14 A’13A12 is used as the chip select of a 4K RAM. What is the memory range of the system? A) C000-CFFFH B) D000-DFFFH C) C000-CFFFH and D000-DFFFH D) 6000-6FFFH and 7000-7FFFH
Question
1 pointIn an 8085 system, CS = A15A14 A’13A12 is used as the chip select of a 4K RAM. What is the memory range of the system? A) C000-CFFFH B) D000-DFFFH C) C000-CFFFH and D000-DFFFH D) 6000-6FFFH and 7000-7FFFH
Solution
The memory range of the system is determined by the chip select (CS) signal. In an 8085 system, the CS signal is given by A15A14 A’13A12.
The 4K RAM means that the memory size is 4*1024 = 4096 bytes.
In hexadecimal, 4096 is 1000H.
So, the lower 12 bits of the address (A0-A11) are used to address the locations within the chip and the upper 4 bits (A12-A15) are used for chip selection.
Given CS = A15A14 A’13A12, we can see that A13 is complemented.
So, the chip is selected when A15A14A13A12 = 1100 or 1101.
In hexadecimal, 1100 is C and 1101 is D.
Therefore, the memory range of the system is from C000 to CFFFH and from D000 to DFFFH.
So, the correct answer is C) C000-CFFFH and D000-DFFFH.
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