Top 100+ Digital Logic And Computer Organization Interview Questions And Answers
Question 1. What Is Digital Logic?
Digital good judgment is the illustration of indicators and sequences of a virtual circuit thru numbers. It is the basis for digital computing and presents a fundamental knowledge on how circuits and hardware talk within a laptop.
Question 2. What Is Combinational Logic?
The time period combinational logic refers to circuitry that transforms bits, rather than storing bits. For example, the ALU part of a CPU transforms records, e.G. Reworking two enter word-sized bit strings into an output that's the sum of the 2 inputs.
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Question three. Explain Sequential Logic?
Sequential good judgment shops facts. Registers in a CPU, RAM and so forth store facts.
Question four. Explain Computer Architecture?
A contemporary meaning of the term computer structure covers 3 factors of computer design:
coaching set architecture.
Question five. Explain Instruction Set Architecture?
Instruction Set Architecture - ISA refers back to the real programmer-visible system interface inclusive of preparation set, registers, memory agency and exception dealing with. Two foremost strategies: RISC and CISC architectures.?
A pc organization and laptop hardware are components of the implementation of a machine. ? Computer corporation consists of the excessive-degree factors of a design, along with the memory machine, the bus shape, and the layout of the internal CPU (where mathematics, good judgment, branching and statistics transfers are carried out).?
Computer hardware refers back to the specifics of a system, protected the certain common sense design and the packaging era of the device.? For a few years the interplay among ISA and implementations become believed to be small, and implementation troubles were no longer a major cognizance in designing preparation set structure. ?
In the 1980’s, it becomes clean that each the problem and inefficiency of pipelining may be accelerated by means of coaching set structure headaches.
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Question 6. What Are The Tasks Of Computer Architects?
Tasks of Computer Architects ?: Computer architects should layout a pc to fulfill useful requirements in addition to charge, electricity, and performance dreams. Often, in addition they ought to decide what the useful necessities are, which may be a main project. ? Once a fixed of functional necessities has been set up, the architect need to attempt to optimize the layout. Here are three important utility regions and their important necessities:
Desktop computer systems: consciousness on optimizing costperformance as measured by means of a single user, with little regard for program length or energy intake.
Server computer systems: cognizance on availability, scalability,and throughput cost-overall performance.
Embedded computer systems : driven by means of price and regularly power troubles, plus code size is critical.
Question 7. What Are The Developments Of Computer Design?
Developments in Computer Design : During the first 25 years of electronic computers both forces, generation and improvements in laptop design made principal contributions. ? Then, in the course of the 1970’s, pc designers have been in large part structured upon included circuit technology, with roughly 35% growth in line with yr in processor overall performance.
In the ultimate 20 year, the mixture of innovations in computer layout and enhancements in technology has led sustained growth in overall performance at an annual rate of over fifty five%. In this era, the principle source of improvements in laptop layout has come from RISCstyle pipelined processors.
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Question 8. Explain Risc Architecture?
RISC Architecture ?: After 1985, any laptop announced has been of RISC architecture. RISC designers focused on two crucial overall performance techniques in pc design: the exploitation of preparation-level the exploitation of practise stage parallelism, first via pipelining and later through more than one practise trouble, the usage of cache, first in simple bureaucracy and later the usage of state-of-the-art companies and optimizations.
Question nine. What Are The Characteristics Of Risc Isa?
RISC ISA Characteristics
All operations on data apply to information in registers and usually alternate the whole sign up; ?
The best operations that affect memory are load and save operations that flow information from memory to a register or to memory from a register, respectively;
?A small quantity of reminiscence addressing modes;
The instruction codecs are few in variety with all commands typically being one size;
Large number of registers; ?
These easy homes result in dramatic simplifications within the implementation of superior pipelining strategies, that's why RISC architecture coaching units had been designed this way.
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Question 10. What Is The Main Example Of Cisc Architecture Processor?
Intel IA-32 processors (in over ninety% computers). ? Intel IA-32 processors, from 80386 processor in early eighty’s to Pentium IV these days, and the following one to be introduced this or subsequent 12 months, are of CISC structure. All Intel IA-32 processors are having as a base the Identical preparation set architecture designed in early 1980’s.
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Question 11. What Does Mips Stand For?
Microprocessor with out Interlocked Pipeline Stages. MIPS processor is one of the first RISC processors. Again, all processors introduced after 1985 had been of RISC architecture.
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Question 12. Explain The Combinational Logic Design Process?
Combinational Logic Design Process :
Create fact table from specification
Generate K-maps & acquire good judgment equations
Draw good judgment diagram (sharing not unusual gates)
Simulate circuit for design verification
Debug & fix issues while output is incorrect
Check truth table in opposition to K-map population
Check K-map groups towards common sense equation product terms
Check common sense equations against schematic
Circuit optimization for location and/or overall performance
Analyze tested circuit for optimization metric
•G, GIO, Gdel, Pdel
Use Boolean postulates & theorems
Re -simulate & verify optimized design
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Question 13. What Are The Design Verification Guidelines?
Design Verification Guidelines :
Use all audits and analysis aids feasible to assist discover capacity design insects
Investigate and correct all mistakes/warnings
Simulate very well however use stimuli that “devour their manner into the layout” trying out one function at a time
more critical for complicated circuits
When circuit doesn’t work, see what works and what doesn’t to slender down the search area for the problem
Which outputs work
Which outputs fail and below what conditions
Monitor lots of internal nodes
Additional simulations (with specific vectors) may be helpful
Remember “debugging is simply fixing out a puzzle”
Also “if some thing doesn’t appearance right, prevent and take a look at it out”
Don’t neglect capability insects
Always re-run audits and simulation after correcting any hassle (or after any changes)
Another worm can be lurking, or
The fix may have messed up some thing else
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Question 14. What Are Sequential Logic Design Steps?
Sequential Logic Design Steps :
Derive circuit kingdom diagram from design specifications
Create kingdom table
Choose flip-flops (D, T, SR, JK)
Create circuit excitation desk
use turn-flop excitation tables
Construct K-maps for:
number one outputs
Obtain minimized SOP equations
Draw common sense diagram
Simulate to verify layout & debug as needed
Perform circuit evaluation & logic optimization
Question 15. Explain About Program Counter (computer)?
The application counter is any other specialised sign in.
It maintains tune of the execution of a application.
It contains the reminiscence deal with of the subsequent instruction to be fetched and finished.
During the execution of an education, the contents of of the PC are updated to correspond to the deal with of the following practise to be finished.
It is standard to mention that PC points to the following preparation this is to be fetched from the reminiscence.
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Question 16. What Are Memory Address Register (mar) & Memory Data Register (mdr)?
These two registers facilitate communique with the reminiscence.
The MAR holds the deal with of the place to be accessed.
The MDR consists of the statistics to be written into or read out of the addressed vicinity.
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Question 17. Explain The Operating Steps For Program Execution?
Operating steps for Program execution :
Programs are saved within the memory thru the enter unit.
Execution of the program begins while the PC is about to point to the first coaching of this system.
The contents of the PC are transferred to the MAR and a Read control signal is sent to the memory.
After the time required to get right of entry to the memory elapses, the addressed phrase (in this situation, the primary education of this system) is examine out of the memory and loaded into the MDR. Next, the contents of the MDR are transferred to the IR .
At this factor, the guidance is prepared to be decoded and carried out.
If the practise entails an operation to be completed through the ALU, it's far important to gain the specified operands.
If an operand is living in memory ( it is able to additionally be in a generalpurpose sign up within the processor), it must be fetched by using sending its address to the MAR and initiating a Read cycle. When the operand has been examine from the memory into the MDR, it's far is transferred from the MDR to the ALU.
After one or greater operands are fetched on this manner, the ALU can carry out the desired operation.
If the end result of the operation is to be stored in the memory, then the end result is despatched to the MDR.
The address of the vicinity wherein the end result is to be saved is despatched to the MAR, and a write cycle is initiated. At a few factor all through the execution of the modern practise, the contents of the PC are incremented in order that the PC points to the following training to be finished.
Thus, as soon as the execution of the present day instruction is completed, a new instruction fetch can be commenced.
In addition to shifting facts among the memory and the processor, the laptop accepts records from enter devices and sends statistics to output gadgets. Thus, a few system commands with the ability to handle I/O transfers are provided.
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Question 18. What Is A Interrupt Service Routine?
Normal execution of a applications can be preempted if a few tool calls for pressing servicing.
For instance, a tracking device in a computer-managed commercial manner may locate a dangerous condition. In order to address the scenario at once, the normal execution of the modern application have to be interrupted. To do this, the device increases an interrupt sign.
An interrupt is a request from an I/O tool for service by means of the processor. The processor presents the asked service by way of executing the proper interrupt-provider ordinary. Because such diversions may additionally alter the inner kingdom of the processor, its nation need to be stored within the reminiscence places earlier than servicing the interrupt.
Normally, the contents of the PC, the general registers, and a few manage information are saved in reminiscence.
When the interrupt provider ordinary is completed, the state of the processor is restored in order that the interrupted application can also retain.
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Question 19. Discuss Various Parameters For Improving The Performance Of A Computer.
The maximum vital degree of the performance of a laptop is how quickly it can execute a programs.The velocity with which a computer executes programs is stricken by the design of its hardware and its machine language instructions.
The total time required to execute a software .
This elapsed time is a degree of the performance of the whole pc device.
It is laid low with the rate of the processor, the disk and the printer.
Here we have to remember handiest the ones periods of the elapsed time, throughout which the processor is lively.
The sum of these periods is referred to as processor time.
The processor time relies upon on the hardware concerned in the execution of man or woman gadget instructions.
The processor and a surprisingly small cache memory may be fabricated on a single IC chip.
The inner velocity of acting the primary steps of practise processing on such chips could be very high and extensively quicker than the rate at which commands and facts can be fetched from the principle memory.
A software might be finished quicker if the motion of commands and information between the main reminiscence and processor is minimized, which is completed via using the cache.
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Question 20. Explain Various Components Of System Software.
Compiler : A machine software program which translates the highlevel language application into a appropriate system language software.
Text editor: Another vital gadget application that all programmers use is a text editor. It is used for coming into and editing utility programs. The user of this software interactively execute instructions that allow statements of a supply software entered at a keyboard to be collected in a report.
Operating machine (OS) : It is a key gadget software program thing. This is a massive application, or genuinely a set of exercises , this is used to control the sharing of and interaction among diverse pc units as they execute software packages. The OS workouts carry out the duties required to assign pc sources to person software programs. These tasks encompass assigning reminiscence to program and facts files, shifting statistics among memory and disk gadgets, and dealing with I/O operations.
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Question 21. Explain The Role Of System Software In A Computer.
System software program is answerable for the coordination of all activities in a computing machine.
System software program is a group of programs which are accomplished as had to carry out capabilities which includes
Receiving and decoding consumer instructions.
Entering and enhancing utility packages and storing them as documents in secondary garage gadgets.
Managing the storage and retrieval of files in secondary garage devices.
Running trendy application programs consisting of word processors, spread sheets, or games, with data provided by means of the person.
Controlling I/O units to obtain input facts and convey output results.
Translating packages from high stage language to low stage language.
Linking and running user-written utility applications with current standard library exercises, including numerical computation programs.
Question 22. Explain How Timing Differences Are Smoothed Out Among Processors, Memories And I/o Devices.
The devices linked to a bus range extensively in their speed of operation.
Electro mechanical gadgets along with key board and printers are enormously sluggish.
Others like magnetic or optical disks, are substantially quicker.
Memory and processor gadgets perform at digital speeds.
A common method to smooth out the timing differences is to encompass buffer registers with the gadgets to maintain the data all through transfers.
They save you a high speed processor from being locked to a slow I/O device at some stage in a sequence of statistics transfers. This permits the processor to replace hastily from one tool to every other, interweaving its procedure hobby with facts transfers concerning several I/O devices.
Thus, buffer registers smooth out timing differences among processors, memories and I/O devices.