Functional Block Diagram of • The functional block diagram of is shown in fig. • The functional blocks of are data bus buffer, read/write logic, . Outputs. The Intel is a 4-channel direct memory access (DMA) controller. It is specifically designed . Block Diagram Showing DMA. Channels. Architecture Of Architecture of Mode Set Register Bit definitions of the register Rotating priority of DMA channels Table: Priority operations of DMA.

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It is a asynchronous input line.

Used to split data and address line. The mark will be activated after each cycles or integral multiples of it from the beginning.


It is a write only registers. In the master d,a, they are the four least significant memory address output lines generated by Analog Communication Interview Questions.

Jobs in Meghalaya Jobs in Shillong. Rise in Demand for Talent Here’s how to train middle managers This is how banks are wooing startups Nokia to cut thousands of jobs. Report Attrition rate dips in corporate India: In master mode it is used for chip select.

It is used to receiving the hold request signal from the output device. It is an active-high asynchronous input signal, which helps DMA to make ready by inserting wait states. These are the four least significant address lines.


Microprocessor Interview Questions. Digital Communication Interview Questions. It is specially designed by Intel for data transfer at the highest speed. Analogue electronics Practice Tests.

It is a modulo MARK output line. In the master mode, the lines which are used to send higher byte of the generated address are sent to the latch. These are the active-low DMA acknowledge lines, which updates the requesting peripheral about the status of their request by the CPU.

PPT – DMA Controller PowerPoint Presentation – ID

In the slave mode, it is connected with a DRQ input line It is a 4-channel DMA. It is active low ,tristate ,buffered ,Bidirectional control lines. In the Slave mode, command words are carried to and status words from These are bidirectional, data lines which help to interface the system bus with the internal data bus of DMA controller. A0-A3 bits of memory address on the lines.

Used to clear mode set registers and status registers A0-A3: Digital Logic Design Practice Tests.

It is high ,it selected the dkagram. It is the hold acknowledgement signal which fontroller the DMA controller that the bus has been granted to the requesting peripheral by the CPU when it is set to 1. It is a status of output line. It is active low ,tristate ,buffered ,Bidirectional lines. Top 10 facts why you need a cover letter? Micro-Controller Overview -Micro-controller overview. Loading SlideShow in 5 Seconds.


It is acknowledgment signal from microprocessor.

By crescent Follow User. This signal is used to convert the higher byte of the memory address generated by the DMA controller into the latches. Microcontrollers Pin Description.

Microprocessor – 8257 DMA Controller

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These are the active-low and high inactive DMA acknowledge lines, which updates the peripheral requesting device service about the status of their request by the CPU. It is designed by Intel to transfer data at the fastest rate.

Features It is a 4-channel DMA.

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