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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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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 is often used when a picture or part of a picture needs to be moved quickly between a frame buffer and regular memory, or when the contents of buffers for a floppy disk need to be quickly transferred to new locations.
In general a DMA controller is used as follows..................[:=> 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,working et..................[:=> 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
technical seminar topic on dma , direct memory access dma and dma controlled i o seminar, seminar paper for dma memory ,
input/output devices as shown in fig. Assume one of the I/O devices is a disk drive and that the computer must load a program from this drive into memory.


The CPU would read the first byte of the program and then write that byte to memory. Then it would do the same for the second byte, until it had loaded the entire program into memory.

implementing dma in 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 v..................[:=> 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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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. One solution is to store these bytes in a special display memory with built-in scanning circuitry and an arbitration scheme 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.
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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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ister (LFSR)
o. Design of Ethernet MAC (Medium Access Control)
p. Design of 16-bit QPSK (Quadrature Phase Shift Keying)
q. Design of Arithmetic Logic Unit (ALU)
r. Design of Stepper Motor Controller
s. Design of DMA (Direct Memory Access) Controller
t. Design of LCD Display
u. Design of 32-Bit RISC (Reduced Instruction Set Computer) Processor
v. Design of PCI-X Bus
w. Design of CRC (Cyclic Redundancy Check) Generator
x. Design of FIR Filter
y. Design of Bluetooth Encryption Algorithm
z. Design of Physical Layer (Base Station Coder CDMA)
aa. Design of Data Encryption S..................[:=> 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 :Thursday 09th of February 2012 03:29:35 AM
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eo controller). The other modes operates in a similar fashion. For a burst mode transfer:-

1) The processor loads the DMA controller with the start address of the destination in memory and the number of words to transfer.

2) When the device delivering or requesting data is ready, the DMA controller is signaled. In turn, the
controller signals the processor that a DMA transfer is pending.

3) The processor acknowledges the request, finishes its current instruction, and then floats the address, control, and data buses.

4) The DMA controller now provides address and control signals to..................[:=> Show Contents <=:]



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