Explain about micro-instruction formats, Computer Engineering

Assignment Help:

Q. Explain about Micro-instruction Formats?

Now let's focus on format of a micro-instruction. The two widely used formats employed for micro-instructions are vertical and horizontal. In horizontal micro-instruction every bit of micro-instruction signifies a control signal that directly controls a single bus line or occasionally a gate in the machine. Though the length ofsuch a micro-instruction can be hundreds of bits. A typical horizontal micro-instruction with its related fields is demonstrated in Figure below.

2317_Explain about Micro-instruction Formats.png

(a)   Horizontal Micro-instruction

1906_Explain about Micro-instruction Formats1.png

(b)   Vertical Micro-instructions

1052_Explain about Micro-instruction Formats2.png

Figure: Micro- instruction Formats

In a vertical micro-instruction several similar control signals can be encoded in a few micro-instruction bits. For example for 16 ALU operations that may need 16 individual control bits in horizontal micro-instruction only 4 encoded bits are required in vertical micro-instruction. In the same way in a vertical micro-instruction only 3 bits are required to select one of eight registers. Though these encoded bits need to be passed from the respective decoders to get the individual control signals. This is shown in figure above.

Generally a horizontal control unit is faster however requires wider instruction words while vertical control units though; require a decoder are shorter in length. Most of systems employ neither purely vertical nor purely horizontal micro-instructions figure (c) above.


Related Discussions:- Explain about micro-instruction formats

Dataflow computing, Dataflow Computing A different to the von Neumann m...

Dataflow Computing A different to the von Neumann model of computation is the dataflow computation model. In a dataflow model, control is fixed to the flow of data. The order o

What is mmu, What is MMU? MMU is the Memory Management Unit. It is a sp...

What is MMU? MMU is the Memory Management Unit. It is a special memory control circuit used for executing the mapping of the virtual address space onto the physical memory.

Classification of digital computer, CLASSIFICATION  OF DIGITAL COMPUTER ...

CLASSIFICATION  OF DIGITAL COMPUTER Computer are classified under a number of factors.Some people classify them according to their processing speed.main memory,technology used

Program testing and debugging, Program testing and debugging: Program ...

Program testing and debugging: Program testing is the method of checking program, to verify that it satisfies its needs and to detect errors. These errors can be of any type-

Explain difference between scanning and parsing, Explain difference between...

Explain difference between Scanning and parsing. Scanning and parsing: Scanning process is the process of recognizing the lexical components in a source string whereas parsin

Explain the do while loops, Explain The do while loops The do while loo...

Explain The do while loops The do while loops is similar, but the test occurs after the loop body is executed. This ensures that the loop body is run at least once.

Major task of a computer to carry out instruction execution, The major task...

The major task of a computer is to carry out instruction execution. The key questions that can be asked in this respect are: (a) how are the instructions provided to computer? And

List the acid properties, a. List the ACID properties. Describe the usefuln...

a. List the ACID properties. Describe the usefulness of each. b. During its implementation, a transaction passes by several states, until it finally commits or aborts. List all

Print a prompt, When your shell is waiting for input from the user, it shou...

When your shell is waiting for input from the user, it should first print a prompt. The prompt should consist of the current working directory followed by the _>_ character. Here i

De moiver theorem, application of de moiver theorem in software engineering...

application of de moiver theorem in software engineering

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