Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 17 Jul 2017 My Price 11.00

microprocessor unit

In a microcomputer, the microprocessor unit (MPU) is always communicating with one of the following: (1) random-access memory (RAM), which stores programs and data that can be readily changed; (2) read only memory (ROM), which stores programs and data that never change; and (3) external input/output (I/O) devices such as keyboards, video displays, printers, and disk drives. As it is executing a program, the MPU will generate an address code that selects which type of device (RAM, ROM, or I/O) it wants to communicate with. Figure 4-79 shows a typical arrangement where the MPU outputs an eight-bit address code A15through A8. Actually, the MPU outputs a 16-bit address code, but the low-order bits A7through A0are not used in the device selection process. The address code is applied to a logic circuit that uses it to generate the device select signals:  width=

width=

Analyze this circuit and determine the following.

(a)*The range of addresses A15through A8that will activate  width=

(b) The range of addresses that activate  width=

(c) The range of addresses that activate  width=

Express the addresses in binary and hexadecimal. For example, the answer to (a) is A15to A8= 000000002to 111011112= 0016to EF16.

Answers

Maurice Tutor
(5)
Status NEW Posted 17 Jul 2017 10:07 PM My Price 11.00

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