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

Explain the transport layer in detail, Explain the transport layer in detai...

Explain the transport layer in detail. Transport Layer: The transport layer controls and makes sure the end-to-end integrity of the data message propagated by the network am

SIDE EFFECT , EXPLAIN SIDE EFFECT OF SCAN CONVERSION WITH DIGRAM

EXPLAIN SIDE EFFECT OF SCAN CONVERSION WITH DIGRAM

Define checkbox in html, Q. Define Checkbox in html? Checkboxes are use...

Q. Define Checkbox in html? Checkboxes are used when one or more out of the group of options is to be chosen. Building Check boxes is very similar to radio buttons. Figure expl

Design a 4 to 1 multiplexer, Design a 4 to 1 Multiplexer by using the three...

Design a 4 to 1 Multiplexer by using the three variable function given by F(A, B, C) = ∑ m(1,3,5,6) Ans. The given function F(A,B,C) = ∑ m(1,3,5,6) can be implemented along wit

Explain significance of init() & destroy( ) method of applet, Explain the s...

Explain the significance of init() and destroy( ) methods of an applet? Also explain two ways of invoking an applet. The init( ) method is utilized for fundamental initializati

What is the difference among thread and process, Thread is a least unit of ...

Thread is a least unit of process. In process have one or more thread.

Connector of conventional keyboard, 5-pin DIN connector: It is the conn...

5-pin DIN connector: It is the connector of conventional keyboard which have 5 pins (2 IN, 2 OUT and one ground pin) used for transfer and synchronization.

Find out data changing from special code to temporal code, Data can be chan...

Data can be changed from special code to temporal code by using ? Ans. By using Shift Registers data can be changed from special code to temporal code. A Register wherein data ge

What do you mean by interrupts, Q. What do you mean by Interrupts? The ...

Q. What do you mean by Interrupts? The term interrupt is an exceptional event which causes CPU to temporarily transfer its control from presently executing program to a separat

Explain debug monitors, Explain Debug monitors. Debug monitors give d...

Explain Debug monitors. Debug monitors give debugging support for a program. A debug monitor executes the program being debugged in its own control thereby giving execution e

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