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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Description: A data auto backup system and method is proposed, applicable in a computer system connected with an external storage device for backing up data of the external storage device to the computer system during a power-off state of the computer system. The computer system includes a bus interface, a storage module, an input/output interface, and a power module. The data auto backup system includes: an input unit for inputting a predefined signal; a memory unit for storing a backup program; a detection unit for detecting whether the exter ....etc

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Abstract

This project will set up a peer-to-peer (network) backup solution. Current backup
systems for personal and small-office computer users usually rely on secondary on-site storage of their data. Although these on-site backups provide data redundancy, they are vulnerable to localized catastrophe. More sophisticated off-site backups are possible but are usually expensive, difficult to manage, and still have a centralized form of redundancy. This project aims to make use of unused hard drive space available in the users c ....etc

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

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Dual-Link Failure Resiliency Through Backup Link Mutual Exclusion

Abstract”
Networks employ page link protection to achieve fast recovery. While the first page link failure can be protected using page link protection, there are several alternatives for protecting against the second failure. This paper formally classifies the approaches to dual-link failure resiliency. One of the strategies to recover from dual-link failures is to employ page link protection for the two failed links independently, which requires that two links may ....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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 i would like to get details on dma controller direct memory access using vhdl vlsi latest ....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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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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