How a typical dma controller can be interfaced to an 8086, Computer Engineering

Assignment Help:

Demonstrate how a typical DMA controller can be interfaced to an 8086/8085 based maximum mode system. 

For 8088 in maximum mode:

The RQ/GT0 and RQ/GT1 pins are used to issue DMA request and receive acknowledge signals. Sequence of events of a typical DMA process

 1) Peripheral asserts one of the request pins for example RQ/GT1 or RQ/GT0 (RQ/GT0 has higher priority)

 2) 8088 completes its current bus cycle and enters into a HOLD state

 3) 8088 grants the right of bus control by asserting a grant signal via the same pin as request signal.

 4) DMA operation starts

 5) Upon completion of the DMA operation, peripheral asserts the request/grant pin again to relinquish bus control.

 

2178_micro.png


Related Discussions:- How a typical dma controller can be interfaced to an 8086

What is swimlane, What is swimlane? In business model, it is often help...

What is swimlane? In business model, it is often helpful to know which human organization is responsible for activity. Show the partition of activities into columns and lines.

List the allowed register pairs of 8085, List the allowed register pairs of...

List the allowed register pairs of 8085. B-C register pair D-E register pair H-L register pair

Explain why most interrupts are active low, Explain why most interrupts are...

Explain why most interrupts are active low? This answers why most signals are active low when you see the transistor level of a module, active low implies that the capacitor in

Array of discount rates, Why do you think you are asked to do valuation giv...

Why do you think you are asked to do valuation given an array of discount rates? a.    Would it not be extra accurate to utilize, for intsnces , CAPM to calculate cost of equity

Subtraction of 01100-00011 using 2's complement method, Subtraction of 0110...

Subtraction of 01100-00011 using 2's complement method Ans. Firstly 1's complement of 00011 is 11100 and 2's complement is 11100 + 1 = 11101. Thus If a last carry is

Explain the structure of virtual enterprise, Explain the Structure of Virtu...

Explain the Structure of Virtual Enterprise. The effective enterprise can be a suitable structure to explore the emerging opportunities for creating value within the informatio

What is bus arbitration, What is bus arbitration? It is method by which...

What is bus arbitration? It is method by which the next device to become the bus master is selected and bus mastership is transferred to it. There are two ways for doing this:

Solve out linear equations, Assume that you have been asked to solve proble...

Assume that you have been asked to solve problem with exact area constraints, the area error being no more than 1% for each department. What are the linear equations you would nee

Program, Write a program to find the area under the curve y = f(x) between ...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

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