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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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ally scanned once every field and thus twice every frame. In this way each dot will actually appear as a double dot on the screen, and the whole picture will be scanned 60 times a second. Now 256 by 240 dots will require 61440 bits of information or 7680 bytes. Scanning through all of these 60 times a second means that there is a little over 2 microseconds to scan each byte. Each time the byte is scanned it has to be fetched from memory. This would be a complete waste of time for the processing power of the CPU.
For the computer to be efficient, it needs special circuitry to read these bytes...................[:=> Show Contents <=:]



MegaSquirt


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:00:34 PM
Last Edited Or Replied at :Saturday 20th of September 2008 12:00:34 PM
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The project's do-it-yourself approach makes it the least-expensive system for this purpose. Basic costs are below US$200 as of 2005, although this can vary widely depending on application.

MegaSquirt is a successor of sorts to Bowling and Grippo's earlier EFI332 design, which was more complex yet more powerful system (at least initially). The EFI332 project started around 1995, and culminated in the release of about 200 kits in 2000. The system used a 32-bit MC68332 microcontroller from Motorola, hence the name. A steep learning curve is believed to have prevented the system from gaining wi..................[:=> 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..................[:=> 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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here are three general types of ball valves: full port, standard port, and reduced port.
A full port ball valve has an oversized ball so that the hole in the ball is the same size as the pipeline resulting in lower friction loss. Flow is unrestricted, but the valve is larger.
A standard port ball valve is usually less expensive, but has a smaller ball and a correspondingly smaller port. Flow through this valve is one pipe size smaller than the valve's pipe size resulting in slightly restricted flow.
In reduced port ball valves, flow through the valve is two pipe sizes smaller than the valve..................[:=> 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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ration 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 on the exhaust camshaft as well, on a number of its..................[:=> 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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onventional multi point fuel injection that happens in the intake manifold.

GDI enables stratified charge (ultra lean burn) combustion for improved fuel efficiency an..................[:=> 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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ntrols the Valvetronic hardware rather than the throttle plate

First introduced by BMW on the 316ti compact in 2001, Valvetronic has since been added to many of BMW's engines. The Valvetronic system is coupled with BMW's proven double-VANOS, to further enhance both power and efficiency across the engine speed range. Valvetronic will not be coupled to BMW's N53 and N54, 'High Precision Injection' (gasoline direct injection) technology due to lack of room in the cylinder head.

Cylinder heads with Valvetronic use an extra set of rocker arms, called intermediate arms (lift scaler), positione..................[:=> 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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US committed to 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 :Wednesday 12th of November 2014 10:46:52 AM
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ble Manufacturing Systems
Iontophoresis
Perpetual Motion Machines
Advanced Cooling Systems
Hydrogen Production using Nuclear Energy
Modern Centrifugal Compressors
Pneumatics Control Systems
The Engineering Research Role in Environmental Noise Control
Micro- and Nano-Mechanics of Surface Contact Plasticity
Air Powered Cars
Fuel Energizer
MegaSquirt
Highly Productive And Reconfigurable Manufacturing System(Hiparms)
Aerodynamics
Regenerative brake
Space Shuttles And Its Advancements
Condenser Bushing
Refined IC Engines
Future Cars
Glass Glue
FADEC - Full Authority Digital ..................[:=> 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 imp..................[:=> 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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CPU sets it’s Bus grant signal, BG to 1.

The CPU also tri-states it’s address, data, and control lines thus truly granting control of the system buses to the DMA controller.

The CPU will continue to tri-state it’s outputs as long as BR is asserted.



..................[:=> 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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les.Priority schemes are important. For example, if a DMA transfer is being made for a video display, then the DMA transfer should always take precedence over the CPU. Otherwise, blank spots will frequently appear on the screen.
You can make transfers whose source or destination is either a fixed I/O port or a block of memory. If the source or destination is in memory, then the address is automatically incremented (or decremented) after each access (byte move). If the source or destination is an I/O port, then the address should remain constant during the transfer.
The 82357 has a very usefu..................[:=> 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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ptive Viterbi Decoder
rr. Design and Implementation of 10/100 Mbps (Mega bits per second) Ethernet Switc..................[:=> 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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esses 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 done. In particular, there are three common choices:-

burst mode DMA :- In burst mode the DMA controller transfers an entire block o..................[:=> Show Contents <=:]



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