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 time sharing operating system, Explain Time sharing operating syste...

Explain Time sharing operating system. Time sharing: It is also called as multi tasking, is a logical execution of multiprogramming. Multiple jobs are executed through the C

Online teaching jobs, Dear, I''m an engineering post graduate in computer s...

Dear, I''m an engineering post graduate in computer science. I would like to work as online tutor. please suggest ideas. Thank You.

Programming in c, Write a program to find the area under the curve y = f(x)...

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

Explain vector-scalar instructions, Vector-Scalar Instructions In this ...

Vector-Scalar Instructions In this category, when combination of vector and scalar are fetched and stored in vector register. These instructions are referred with the subsequen

Explain indirect cycle in control unit, Q. Explain Indirect Cycle in contro...

Q. Explain Indirect Cycle in control unit? Once an instruction is fetched the subsequent step is to fetch the operands. The instruction may have indirect and direct addressing

Architecture, write a program in assembly language using emu8086 so that th...

write a program in assembly language using emu8086 so that the input string can contain both lower and upper case letters and any other character and the output will be the reverse

Illustrate the execute cycle, Q. Illustrate the Execute Cycle? The fetc...

Q. Illustrate the Execute Cycle? The fetch and indirect cycles include a small, fixed sequence of micro-operations. Every one of these cycles has fixed sequence of micro-operat

How can a function return a pointer to its calling routine, How can a funct...

How can a function return a pointer to its calling routine? The general form of a function is: type_specifier function_name(parameter list) { body of function; }

Explain the graphic display system, Q. Explain the graphic display system? ...

Q. Explain the graphic display system? The function of your graphic display system is to display bit-mapped graphics on your monitor.  The image displayed on your system so com

What is laser printers, Q. What is Laser Printers? Laser Printers are p...

Q. What is Laser Printers? Laser Printers are page printers. For print quality they also face same addressability issues as DMP/InkJet Printers. Though some other methods are p

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