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

Token packets - universal serial bus, Token packets in universal serial b...

Token packets in universal serial bus - computer architecture: Token packets consist of a PID byte followed by two payload bytes: a 5-bit CRC and 11 bits of address. Tokens

How does tcp take of wrapping over of sequence numbers, How does TCP take o...

How does TCP take of wrapping over of sequence numbers? To handle out of instruct deliveries, transport protocols utilize sequencing. The sending side attaches a sequence numbe

What are the four factors of open source software, What are the four signif...

What are the four significant factors that led to the development of open source software? 1. To diminish the high control value of the Proprietary Software 2. To avoid disc

Explain metadata, What is metadata? Metadata is data that explains anot...

What is metadata? Metadata is data that explains another data. Class definition is metadata. Models are inherently metadata as they explain the things being modeled.

Micro-programmed control, Q. MICRO-PROGRAMMED CONTROL? A substitute to ...

Q. MICRO-PROGRAMMED CONTROL? A substitute to a hardwired control unit is a micro-programmed control unit in which logic of the control unit is specified by a micro-program. A m

What is an i/o interface, What is an I/O Interface? Input-output interf...

What is an I/O Interface? Input-output interface provides a method for transferring binary information among internal storage, like memory and CPU registers, and external I/O d

Dynamic programming, Given: • A sequence of n arrival times t0, t1, ..., ...

Given: • A sequence of n arrival times t0, t1, ..., tn-1, • a library of mlogically equivalent gates {(d0, c0), (d1, c1), ..., (dm-1,cm-1)} where d is delay and c is cost • a

C++, At a shop of marbles, packs of marbles are prepared. Packets are named...

At a shop of marbles, packs of marbles are prepared. Packets are named A, B, C, D, E …….. All packets are kept in a VERTICAL SHELF in random order. Any numbers of packets with thes

What is literal, Meaning of Literal is:- Literal is string constant.

Meaning of Literal is:- Literal is string constant.

Explain about shared features of olap, Shared executes most of the security...

Shared executes most of the security features into OLAP. If multiple accesses are needed admin can make essential changes. The default security level for all OLAP products is read

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