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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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a frame buffer. The memory in such a system is said to be dual ported because there are two different ways to access it.
In contrast, one of the first low-cost systems stored these bytes in regular memory (single ported) and 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 ve..................[:=> 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 ca..................[:=> Show Contents <=:]


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
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Direct memory access (DMA) is a means of having a peripheral device control a processor's memory bus directly.

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 ..................[:=> 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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devices then relinquish control of the bus by putting their lines into tri-state condition ; they then grant the bus to the DMA controller; and finally, the DMA controller takes over the bus, generating its own address and control signals for the bus and causing the transfer of information.
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 f..................[:=> Show Contents <=:]

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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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(Reduced Instruction Set Computer) Processor
ll. Design of AES (Advanced Encryption Standard) Encryption and Decryption Algorithm with 128-bits Key Length
mm. Design and Implementation of USB 2.0 Transceiver Macro-cell Interface (UTMI)
nn. Design and Implementation of Lossless DWT/IDWT (Discrete Wavelet Transform & Inverse Discrete Wavelet Transform) for Medical Images
oo. Design of an Open Core Protocol (OCP) IP Block
pp. Design and Implementation of Reversible Watermarking for JPEG2000 Standard
qq. Design and Implementation of Adaptive Viterbi Decoder
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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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mode to use is determined by the system requirements.

Burst Mode DMA
Burst mode DMA is a typical way of handling bulk data transfers (like the idea we described for our video controller). The other modes operates in a similar fashion. For a burst mode transfer:-

1) The processor loads the DMA controller with the start address of the destination in memory and the number of words to transfer.

2) When the device delivering or requesting data is ready, the DMA controller is signaled. In turn, the
controller signals the processor that a DMA transfer is pending.

3) The processor ..................[:=> Show Contents <=:]

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