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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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ast, 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 reco..................[:=> Show Contents <=:]



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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 e..................[:=> 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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utputs as long as BR is asserted.



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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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putting their lines into tri-state condition ; they then grant the bus to the DMA controller; and finally, the DMA 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...................[:=> Show Contents <=:]



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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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h 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. Design and Implementation of 16-QAM (Quadrature Amplitude Modulation) Modulator and Demodulator
kk. Design of 64-bit RISC (Reduced Instruction Set Computer) Processor
ll. Design of AES (Advanced Encryption Stan..................[:=> 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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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
instruction, it tri-states the data, address, and control l..................[:=> Show Contents <=:]



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