Sequence of micro -operations to perform a specific function, Computer Engineering

Assignment Help:

Q. Sequence of micro -operations to perform a specific function?

A digital system executes a sequence of micro-operations on data stored in registers or memory. Specific sequence of micro-operations performed is predetermined for an instruction. So an instruction is a binary code specifying a definite sequence of micro-operations to perform a specific function.

For illustration a C program instruction sum = sum + 7 will first be converted to equivalent assembly program:

  • Move data from memory location 'sum' to register R1 (LOAD R1, sum)
  • Add an immediate operand to register (R1) and store the results in R1

(ADD R1, 7)

  • Store data from R1 register to memory location 'sum' (STORE sum, R1).

So several machine instructions may be required (this will differ from machine to machine) to execute a simple C statement. However how will every one of these machine statements be executed with the help of micro-operations? Let's try to explain the execution steps:

  • Fetch instructions.
  • Pass address of Program Counter (PC) to Memory Address Register (MAR).
  • Issue the memory read operation to fetch instruction in Buffer Register for data like (MBR).
  • Increment Program Counter to refer to subsequent instruction in sequence and bring instruction to Instruction Register (IR).
  • Execute instruction
  • Decode instruction to ascertain operation.
  • As one of the operands is already available in R1 register and second operand is an immediate operand thus fetch operand step is not needed. The immediate operand is available in address part of instruction.
  • Perform ALU based addition with R1 and buffer register store result in R1.

So we may have to execute instruction in several steps. For later discussion, for simplicity let's presume that every micro-operation can be completed in one clock period though some micro-operations need memory write/read which may take more time.


Related Discussions:- Sequence of micro -operations to perform a specific function

What is the difference among a canvas and a scroll panel, Canvas is a compo...

Canvas is a component. ScrollPanel is a container. Canvas is a rectangular area where the application can draw or trap input events. ScrollPane executes horizontal and vertical scr

How do you recognize the performance bottlenecks, Performance Bottlenecks c...

Performance Bottlenecks can be identified by using monitors. These monitors might be application server monitors, database server monitors, web server monitors and network monitors

What is nv-ram, Nonvolatile Read Write Memory, also kown as Flash memory. I...

Nonvolatile Read Write Memory, also kown as Flash memory. It is also called as shadow RAM.

Compare memory mapped i/o with i/o mapped i/o, Compare memory mapped I/O wi...

Compare memory mapped I/O with I/O mapped I/O. Memory Mapped I/O Scheme: In this scheme there is only one address space. Address space is stated as all possible addresses tha

Smtp vs esmtp, what shortcomings of smtp are over come by esmtp?

what shortcomings of smtp are over come by esmtp?

What is a flip-flop, What is a flip-flop? Ans. Flip-flop is particu...

What is a flip-flop? Ans. Flip-flop is particular bit memory cell. This stores individual bit information in its true and compliment form. It is the basic block of any sequ

C++ program on pebble merchant, how to solve pebble merchant problem.? codi...

how to solve pebble merchant problem.? coding for it..!

Explain demand paging, What is Demand paging? Virtual memory is commonl...

What is Demand paging? Virtual memory is commonly executed by demand paging. In demand paging, the pager brings only those essential pages into memory instead of swapping in a

What are the advantages of segmentation, What are its advantages? How is se...

What are its advantages? How is segmentation implemented in typical microprocessors? The first benefit that memory segmentation has is that only 16 bit registers are necessary

Draw logic circuit for the simplified function, Minimize the logic function...

Minimize the logic function Y(A, B, C, D) = ∑m(0,1,2,3,5,7,8,9,11,14). Use  Karnaugh map. Draw logic circuit for the simplified function. Ans: In following figure (a) shows the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd