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

Determine the output of T-flipflops in cascade, If  the input to T-flipflop...

If  the input to T-flipflop is 100 Hz signal, the final output of the three T-flipflops in cascade is ? Ans. The  final  output  of  the  three  T-flip-flops in cascade is 12.5 H

Function of host to host transport layer in tcp/ip protocol, Illustrate the...

Illustrate the function of host to host transport layer in TCP/IP protocol stack? Function of Host - to-Host Transport Layer: This protocol layer just above inter network

How a physical addressing is performed in wan, How physical addressing is p...

How physical addressing is performed in WAN? WAN networks operate as similar to a LAN. All WAN technology classifies the exact frame format a computer uses while sending and re

Prolog programming language - artificial intelligence, Prolog Programming L...

Prolog Programming Language - Artificial intelligence: Most of the programming languages are procedural: the programmer specifies exactly the correct instructions (algorithms)

Asp.net, in asp project is i have to crate database every time when i move ...

in asp project is i have to crate database every time when i move my project on different server

How is a valid user identifier accomplished, How is a valid user identifier...

How is a valid user identifier accomplished? A valid user identifier is accomplished within one or more of given ways: • Provide some password, which only user knows. • P

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.

Explain processing of an interrupt, Q. Explain Processing of an Interrupt? ...

Q. Explain Processing of an Interrupt? The interrupt is processed as: Step 1: Number field in INT instruction is multiplied by 4 to get its entry in interrupt vector table.

Explain what are design patterns, Design Patterns are easy and elegant solu...

Design Patterns are easy and elegant solutions of commonly having problems in software design. Design Patterns make it simpler to reuse successful designs and architectures of expe

Copy file from a floppy disk to the hard disk, Q. Copy file from a floppy d...

Q. Copy file from a floppy disk to the hard disk? While using a PC, often you need to copy file from a floppy disk to the hard disk or vice-versa.  For instance, you buy some s

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