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Q. Explain about Instruction Register and Flags?
The Instruction Register: It comprises the operation code (opcode) and addressing mode bits of the instruction. It assists in determining the numerous cycles to be performed and hence determines related micro-operations that are required to be performed.
Flags: Flags are used by CU for determining the status of CPU and the results of a previous ALU operation. For illustration a zero flag if set conveys to control unit that for instruction ISZ (skip subsequent instruction if zero flag is set) the next instruction has to be skipped.
Explain Combinational logic circuits Ans. Combinational logic circuits:- (i) Outputs only depend upon present state of the input. (ii) No memory element present or no f
The mercantile process model consists of which of the pahase(s): The pre-purchase phase. Purchase consummation phase. Post-purchase Interaction phase.
Explain the term- Hacking Use of passwords and ids to prevent illegal access to files. Also locking the computer itself or locking computer room can help here. Encryption s
How many bits must be decoded for chip select? What is the size of decoder when 128 × 8 RAM chips are required to provide a memory capacity of 2048 bytes? Ans. All higher order l
Explain the principle of duality with examples.
Branch (control) hazards in computer architecture : Branching hazards (also called control hazards) take place when the processor is told to branch -for example, if a defin
What is computer virus? A computer virus is a computer program that is designed to spread itself between computers. Computer virus are inactive when standing a
Q. Addressing Relationship for Main Memory and Cache? In the normal case there are 2k words in cache memory and 2n words in main memory. The n-bits memory address is splitted i
What are overlays? To enable a process to be larger than the amount of memory allocated to it, overlays are used. The idea of overlays is to keep in memory only those instructi
Design a mod-12 Synchronous up counter. Ans. Design of a mod 12 synchronous counter by using D-flipflops. I state table Present state Next
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