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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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me between the memory accesses by the scanning circuitry and memory accesses by the CPU. (This solution is mostly used today by the use of Video RAM – VRAM.) This is sometimes called 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. ..................[:=> Show Contents <=:]



VTEC


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:59:36 AM
Last Edited Or Replied at :Wednesday 13th of February 2013 08:48:58 AM
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VTEC (standing for Variable valve Timing ..................[:=> Show Contents <=:]



Globe valves


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:58:47 AM
Last Edited Or Replied at :Saturday 20th of September 2008 11:58:47 AM
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ling and frequent operation. Since the baffle restricts flow, they're not recommended where full, unobstructed flow is required.

A bonnet provides leakproof closure for the valve body. Globe valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest bonnet, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection or cleaning. It also gives the body added strength. Bolted bonnet is used for larger or higher pressure applications.

Many globe valves have a class rating that corresponds to the pressure specific..................[:=> Show Contents <=:]



ball valve


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:57:34 AM
Last Edited Or Replied at :Saturday 20th of September 2008 11:57:34 AM
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hole is perpendicular to the ends of the valve, and flow is blocked. The handle position lets you 'see' the valve's position.

Ball valves are durable and usually work to achieve perfect shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications (and are often preferred to globe valves and gate valves for this purpose). They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose.

The body of ball valves may be made of metal, ceramic, or plastic. The ball may be chrome plated to make it..................[:=> Show Contents <=:]



VANOS Variable Nockenwellen Steuerung


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:56:59 AM
Last Edited Or Replied at :Sunday 29th of September 2013 05:23:13 AM
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Teves. VANOS varies the duration of the intake valves by moving the position of the camshafts in relation to the drive gear. This movement varies from 6degrees of advanced to 6degrees of retarded camshaft timing. BMW recently began offering 'double' VANOS, which operates..................[:=> Show Contents <=:]



Gasoline direct injection or GDI


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:55:43 AM
Last Edited Or Replied at :Saturday 26th of June 2010 08:03:19 AM
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e petrol engines. The gasoline or biobutanol ..................[:=> Show Contents <=:]



Valvetronic


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:55:16 AM
Last Edited Or Replied at :Saturday 20th of September 2008 11:55:16 AM
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he Valvetronic system is the first variable valve timing system to offer continuously variable timing (on both intake and exhaust camshafts) along with continuously variable intake valve lift, from ~0 to 10 mm, on the intake camshaft only. Valvetronic-equipped engines are unique in that they rely on the amount of valve lift to throttle the engine rather than a butterfly valve in the intake tract. In other words, in normal driving, the 'gas pedal' controls the Valvetronic hardware rather than the throttle plate

First introduced by BMW on the 316ti compact in 2001, Valvetronic has since been ..................[:=> Show Contents <=:]



BlueTec


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:52:33 AM
Last Edited Or Replied at :Monday 26th of January 2015 04:23:38 AM
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o selling diesel models in the 2007 model year...................[:=> Show Contents <=:]



List of mechanical Seminar topics4


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:52:04 AM
Last Edited Or Replied at :Friday 01st of January 2016 04:32:59 AM
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r rocket fuel pump
Traction control
Adaptive Cruise Control
Vacuum Work holding
New rolling technique for texturing
Acoustic Parking Systems
Flywheel Batteries
Highly Productive And Reconfigurable Manufacturing System, (Hiparms)
Hydrogen Car
Active Control of Near-Wall Turbulent Flow
Power frequency magnetic fields
Multi Valve Engine
Power System Contingencies
Non Destructive Evaluation Techniques
Trenchless Technology
Recycling Of Plastics
Low Cost Spacecraft Simulator
Particle Reinforced Aluminium Matrix Composites
Total Productive Maintenance
New Finite Element Analysi..................[:=> Show Contents <=:]



dma controller direct memory access using vhdl vlsi latest


Posted by:
Created at: Saturday 25th of July 2015 02:19:39 AM
Last Edited Or Replied at :Saturday 25th of July 2015 03:57:39 AM
I would like to know more about implementation o..................[:=> Show Contents <=:]



ppt presentation on 8237 dma controller


Posted by:
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
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a computer system

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

It connects directly to the I/O device at one end and to the system buses at the other end. It also interacts with the CPU, both via the system buses and two new direct connections.

data transfer using dma controller

To transfer data from an I/O device to memory, the DMA controller first sends a Bus Request to the CPU by setting BR to 1. When it is ready to grant this request, the CPU sets it’s Bus grant signal, BG to 1.

The CPU also tri-states it’s address, data, and control ..................[:=> 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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ed 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 for making quick transfers of information. For example, DMA ..................[:=> 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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ryption Algorithm
z. Design of Physical Layer (Base Station Coder CDMA)
aa. Design of Data Encryption Standard (DES)
bb. Design of Floating-Point Multiplier using IEEE-754 Standard
cc. Design of HDLC (High Level Data Link Controller)
dd. Design of 8-Bit Microcontroller
ee. Design of I2C Protocol IP Block
ff. Design of an AMBA-Advanced High performance Bus (AHB) Protocol IP Block
gg. Design of an Bus Bridge between OCP and AHB Protocol
hh. Design and Realization of a CAN Bus Protocol
ii. Design of Gigabit Ethernet MAC (Medium Access Control) Transmitter and Receiver
jj. De..................[:=> 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 :Wednesday 28th of January 2015 02:30:17 PM
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e block of data without interruption. During the time of the transfer, the DMA controller retains complete control of the processor's bus.

Cycle Stealing :- If it is desirable to let the processor do some processing while the DMA controller transfers data cycle stealing can be used. In this case, the DMA controller will periodically request use of the bus until all of its data are transferred. This slows down the processor and the DMA transfer.

Transparent DMA :- It is possible for the DMA controller to monitor the internal status of the processor. In those cases where the processor does..................[:=> Show Contents <=:]



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