Allocation of bits among opcode and operand, Computer Engineering

Assignment Help:

Allocation of Bits among Opcode and Operand

The trade-off here is between numbers of bits of opcode vs. the addressing capabilities. An interesting development in this regard is development of variable length opcode. 

A number of the factors which are considered for selection of addressing bits:

  • Number of addressing modes: The more are the explicit addressing modes more bits are required for mode selection. Though some machines have implicit modes of addressing.
  • As far as memory references are concerned granularity suggests whether an address is referencing a byte or a word at a time. This is more relevant for machines that have 16 bits, 32 bits and so on higher bit words. Byte addressing though may be better for character manipulation, butneed more bits in an address. For illustration memory of 4K words (1 word = 16 bit) is to be addressed directly then it needs:

WORD Addressing   = 4K words

                           = 212words

                        ⇒ 12 bits are needed for word addressing.

 

Byte Addressing    = 212 words

                          = 213 bytes

                        ⇒ 13 bits are needed for byte addressing.


Related Discussions:- Allocation of bits among opcode and operand

Impact of information systems, What are the primary impacts of information ...

What are the primary impacts of information systems on an organization (employer, club, school, religious, etc..) for which you are familiar? What are the primary ways in which

Explain meaning of each field format of icmp header, Give the format of ICM...

Give the format of ICMP header and explain meaning of each field. The format of ICMP header is given below: Internetwork Control Message Protocol (ICMP) ICMP H

State and prove demorgan's second theorem, State and prove Demorgan's secon...

State and prove Demorgan's second theorem   Proof: Demorgan's second theorem   = A‾ + B‾ The two sides of the equation here   = A‾ + B‾ is represented through the logic d

Explain process control block, Explain Process Control Block Process Co...

Explain Process Control Block Process Control Block (PCB): Information related with every process is stored in Process control Block. a) Process state b) Program counter c

What do you mean by best fit, What do you mean by best fit?  Best fit a...

What do you mean by best fit?  Best fit allocates the smallest hole that is big enough. The whole list has to be searched, unless it is sorted by size. This method makes the sm

Doubly linked list, A doubly linked list is like a linked list except that ...

A doubly linked list is like a linked list except that each node has a pointer both to the next node in the list and to the previous node in the list. There are also pointers to th

Explain passing parameters using pointers, Q. Explain Passing Parameters Us...

Q. Explain Passing Parameters Using Pointers ? This method overcomes the drawback of using variable names directly in procedure. It uses registers to pass procedure pointers to

Define a formal system, Q. Define a Formal System? A Formal System is o...

Q. Define a Formal System? A Formal System is one which is planned in advance and is used according to schedule. In this system procedures and policies are documented well in a

Which device changes from serial data to parallel data, Which device change...

Which device changes from serial data to parallel data ? Ans. Demultiplexer is the device that changes from serial data to parallel data. Demultiplexer takes data in from on

Subprogram or procedure level, SubProgram or Procedure Level This level...

SubProgram or Procedure Level This level consists of subroutines, procedures or subprograms. Average grain size is used at this level containing various thousands of instructio

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