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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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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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 get details on dma controller direct memory access using vhdl vlsi latest ....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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HEATSINK CALCULATION AND EXAMPLES
In many cases, GS-Rx and GSxTy-z modules don’t require any additional cooling methods because the dimensions and the shape of the metal boxes were studied to offer the minimum possible thermal resistance case to ambient for a given module. It should be remembered, that GS-R and GS-T modules are power devices i.e. products that deliver power and dissipate power and, depending on ambient temperature, an additional heat-sink or forced ventilation or both may be required to ....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—
In this paper, we address the problem of nonlinear
sensor dynamic compensation that will be performed on board
wireless sensor network nodes. To this aim, we design suitable
reduced-complexity learning-from-example algorithms and implement
them on resource-constrained devices, namely, 8-bit
microcontrollers. The proposed approach is validated with simulations
on different examples of nonlinear sensor models.
Index Terms—Dynamic compensation, low power, microcontroller
implementation, reduced-set methods, support v ....etc

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