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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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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. 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 recommen..................[:=> 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 diag..................[:=> 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 ,
uter 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 via the system buses and two new direct connections.

data transfer using dma controller

To..................[:=> 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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A controller takes over the bus, generating its own address and control signals for the bus and causing the transfer of information.
The Intel 82357 DMA Controller is used to perform DMA transfers. It comes with 40-pin package. The 82357 DMA Controller can provide service for a total of four different devices at once. For example, on 82357 DMA Controller might be handling transfers for two different CRT (Cathode Ray Tube) displays, a floppy-disk controller and a magnetic tape unit. Each device is assigned a channel in the 82357. By connecting several DMA chips together, any number of channels..................[:=> 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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eceiver Transmitter (UART) “ 16550
k. Design of OFDM (Orthogonal Frequency Division Multiplexing) Transmitter
l. Design of a Reconfigurable Coprocessor for Redundant Radix-4 Arithmetic
m. Design of SRAM (Static Random Access Memory)
n. Design of Pseudo Random Binary Sequence (PRBS) and Linear Feedback Shift Register (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..................[:=> 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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g.

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 memory while the device requesting the transfer supplies or receives the data.

5) Once the transfer is complete, the DMA signals the processsor to resume its normal operation.

The signaling of the 8088 processor is done through the hold and holda lines. When the DMA controller wants the bus, it signals the processor by raising hold. After the processor completes the current
instructio..................[:=> Show Contents <=:]



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