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

For 8088 in maximum mode:

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

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

2. 8088 finishes its current bus cycle and enters in a HOLD state

3. 8088 grants the right of bus control through asserting a grant signal via similar pin as the request signal.

4. DMA operation starts

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

Typical DMA controller

Posted Date: 5/25/2013 4:20:05 AM | Location : United States

Ask an Expert

Related Discussions:- How typical dma controller can be interfaced to 8086/8085, Assignment Help, Ask Question on How typical dma controller can be interfaced to 8086/8085, Get Answer, Expert's Help, How typical dma controller can be interfaced to 8086/8085 Discussions

Write discussion on How typical dma controller can be interfaced to 8086/8085
Your posts are moderated

Write your message here..

Related Questions

Techniques and resources in problem base learning, Techniques and resources... Techniques and resources Different techniques and resources were used in different areas of the problem during the course of the project. The most important of them was th

Ac motors, AC Motors DC motors that have their magnetic fields produce... AC Motors DC motors that have their magnetic fields produced by coils as described earlier can, in principle,  be powered from AC as well, since if the applied voltage reverse

Find the force-current analog as well as the force voltage, Q. (a) The c... Q. (a) The concept of duality can be extended to nonelectric physical systems bymeans of analogs. For example, the mechanical system characteristics can be investigated by means

Static characteristics of the npn silicon bjt, Consider the common-emitter ... Consider the common-emitter BJT circuit shown in Figure (a). The static characteristics of the npn silicon BJT are given in Figure (b) along with the load line. Calculate iB for v

Growth in communications, The growth in communications over the past 60 yea... The growth in communications over the past 60 years has been phenomenal. The invention of the transistor in 1947 and the integrated circuit and laser in 1958 have paved the way to

How to calculate back pitch, Q.   A 6 - pole, DC armature with 36 slots and... Q.   A 6 - pole, DC armature with 36 slots and 2 coil - slides/slot is to be wave wound (double layer). Calculate the back pitch, front - pitch and commentator pitch. How many dumm

Microcontroller interfacing, The winch uses a 415 Volt 50 Hz AC motor, so b... The winch uses a 415 Volt 50 Hz AC motor, so both the up/down and run/stop controls actually operate +24V relays, whose contacts switch the 415Vac to the winch. The relays also pro

Reduce the circuit to a thevenin and a norton equivalent, Q. Reduce the cir... Q. Reduce the circuit of Figure to a Thévenin and a Norton equivalent circuit with respect to terminals a-b.

Application of plc - stepper motor , Application of PLC a. A PLC  is us... Application of PLC a. A PLC  is used to start  and stop  the motors  of a segmented conveyor beli. This  allows  only belt section carrying  a copper plate to move. b.In aut

Show the block diagram for a 3-bit ripple counter, Q. (a) For a JKFFwith JK... Q. (a) For a JKFFwith JK = 11, the output changes on every clock pulse. The change will be coincident with the clock pulse trailing edge and the flip-flop is said to toggle, when T