DIRECT MEMORY ACCESS




introduction

An important aspect governing the Computer System performance is the transfer of data between memory and I/O devices.

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 driv ....etc

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You hit the power button on your television and it instantly comes to life. But do the same thing with your computer and you have to wait a few minutes while it goes through its boot-up sequence. Why can't we have a computer that turns on as instantly as a television or radio? IBM, in cooperation with Infenion, is promising to launch a new technology that will eliminate the boot-up process. Magnetic random access memory (MRAM) has the potential to store more data, access that data faster and use less power than current memory technologies.

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I would like to know more about implementation of dma using vhdl ....etc

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INTRODUCTION
Network bandwidths have been increasing and Latencies through these networks have been decreasing. Unfortunately, applications have not been able to take full advantage of these performance improvements due to the many layers of user level and kernel level software that is required to get to the network. The Direct Access File System (or simply DAFS) developed by Microsoft, Compaq and Intel, significantly reduces the software overhead between a high performance CPU/memory subsystem, and a high performance network. Direct Access F ....etc

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 i would like to get details on dma controller direct memory access using vhdl vlsi latest ....etc

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Abstract:
The Direct Internet Access System (DIAS), jointly developed by Banyan Networks and TeNeT Group, liT Madras, allows telecom service providers to provide high bandwidth Internet access to residential and corporate . subscribers, in addition to voice services, without any changes to the existing cabling infrastructure. In contrast to current residential PSTN (Public Switched Telephone Network) and ISDN (Integrated Switched Digital Network) dial-up access, the DIAS provides an Always On Internet Access that is permanently available at t ....etc

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Abstract
The ordinary CDMA technology has the disadvantage of identifying the users using the appropriate signature of each user. Since many users tend to use the transmission media, there is always a chance for superimposition of signals that can cause interference in network.

The solution for this inconvenience comes in the form of interleaving which separates the users. This special form of CDMA technology offers some of the features of CDMA such as the dynamic channel sharing, mitigation of cross cell reference, asynchronous tran ....etc

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Definition
The Idea Of Direct Memory Access
By providing circuitry to generate addresses and memory control signals independently of the processor we see that it is possible to improve performance considerably. All that is necessary is to provide a signal to tell the processor to remove itself from the bus so there is no contention on the memory control, address, or data lines.

This is the entire concept behind direct memory access (DMA). To complete our picture, it is important to note that there are actually several ways that DMA can be ....etc

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ABSTRACT
While magnetic and semi-conductor based information storage devices have been in use since the middle 1950â„¢s, todayâ„¢s computers and volumes of information require increasingly more efficient and faster methods of storing data. Among the most promising of the new alternatives are photopolymer-based devices, holographic optical memory storage devices, and protein-based optical memory storage using rhodopsin , photosynthetic reaction centers. This paper focuses mainly on protein-based optical memory storage using the photosen ....etc

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Random access memory (RAM) is the best known form of computer memory. RAM is considered random access because you can access any memory cell directly if you know the row and column that intersect at that cell.


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