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DMA Controller


Posted by: seminar class
Created at: Thursday 21st of April 2011 11:53:35 PM
Last Edited Or Replied at :Friday 30th of November 2012 01:17:30 AM
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The Intel 82357 DMA Controller is used to perform DMA transfers. It comes with 40-pin package. The 82357 DMA Controller can provide service for a total of four different devices at once. For example, on 82357 DMA Controller might be handling transfers for two different CRT (Cathode Ray Tube) displays, a floppy-disk controller and a magnetic tape unit. Each device is assigned a channel in the 82357. By connecting several DMA chips together, any number of channels can be supported at once. The 82357 has registers to keep track of source and destination addresses, counts and masks, and commands a..................[:=> Show Contents <=:]



ppt presentation on 8237 dma controller


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Created at: Thursday 29th of November 2012 11:00:51 AM
Last Edited Or Replied at :Friday 30th of November 2012 01:17:27 AM
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8237 dma cantroller :pin diagram,workin..................[:=> Show Contents <=:]



DIRECT MEMORY ACCESS details


Posted by: seminar paper
Created at: Wednesday 14th of March 2012 04:59:28 AM
Last Edited Or Replied at :Wednesday 14th of March 2012 04:59:28 AM
technical seminar topic on dma , direct memory access dma and dma controlled i o seminar, seminar paper for dma memory ,

computer system with dma

Consider a typical system consisting of a CPU ,memory and one or more input/output devices as shown in fig. Assume one of the I/O devices is a disk drive and that the computer must load a program from this drive into memory.


The CPU would read the first byte of the program and then write that byte to memory. Then it would do the same for the second byte, until it had loaded the entire program into memory.

implementing dma in a computer system

A DMA controller implements direct memory access in a computer system.

It connects directly to ..................[:=> Show Contents <=:]



DMA Controller


Posted by: seminar class
Created at: Thursday 21st of April 2011 11:53:35 PM
Last Edited Or Replied at :Friday 30th of November 2012 01:17:30 AM
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d the scanning circuitry consisted mainly of a device called a DMA controller which actually took over the bus and generated it own address and controlled information on the system’s bus. The Dazzler actually had only about a third of the resolution in this example and it was designed to work with a clock speed of about 2 megahertz, but this presents a timing problem very comparable to the one in the example.
Because of the narrow or impossible timing constrains, DMA as described above is not recommended for direct scanning of regular memory for video display, but is the preferred method fo..................[:=> Show Contents <=:]



vlsi project ideas


Posted by: electronics seminars
Created at: Friday 15th of January 2010 01:21:21 PM
Last Edited Or Replied at :Thursday 23rd of February 2012 01:25:25 AM
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Design of JPEG Image compression standard
f. Design of RS-232 System Controller
g. Design of 16 Point Radix-4 FFT (Fast Fourier Transform) Algorithm
h. Design of Triple Data Encryption Standard (DES)
i. Design of Floating Point Unit (FPU)
j. Design of Universal Asynchronous Receiver Transmitter (UART) “ 16550
k. Design of OFDM (Orthogonal Frequency Division Multiplexing) Transmitter
l. Design of a Reconfigurable Coprocessor for Redundant Radix-4 Arithmetic
m. Design of SRAM (Static Random Access Memory)
n. Design of Pseudo Random Binary Sequence (PRBS) and Linear Feedb..................[:=> Show Contents <=:]



Direct Memory Access


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:21:32 PM
Last Edited Or Replied at :Thursday 09th of February 2012 03:29:35 AM
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ssor is done through the hold and holda lines. When the DMA controller wants the bus, it signals the processor by raising hold. After the processor completes the current
instruction, it tri-states the data, address, and control lines, and raises hold ackn..................[:=> Show Contents <=:]



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