Direct Memory Access (DMA): Working, IO Transfer Modes, and Timing Explained

Direct Memory Access - DMA is explained with the following Timestamps:
0:00 - Direct Memory Access - DMA - Computer Organization & Architecture
1:35 - Working of Direct Memory Access
9:03 - Modes of DMA
11:39 - Timings of DMA

Direct Memory Access - DMA is explained with the following outlines:
0. Computer Organization & Architecture
1. Input Output Organization
2. IO Transfer Modes
3. Direct Memory Access - DMA
4. Working of Direct Memory Access
5. Modes of DMA
6. Timings of DMA

Here i have explained two modes of DMA
1. Cycle Stealing Mode of DMA
2. Burst Mode of DMA

Here i have explained two categories of timings of DMA
1. CPU busy State
2. CPU block State

Chapter-wise detailed Syllabus of the Computer Organization & Architecture Course is as follows:

Computer Architecture, Von Neumann Architecture, Harvard Architecture, Comparison of Von Neumann and Harvard Architecture, Flynn's Classification, RISC and CISC Architecture, Little Endian and Big Endian Computer, Memory Interfacing examples, Registers of computer, Registers organization in computer, Common Bus Access in Computer, Examples on Registers of Computer

Instruction Formats, Examples on Instruction Formats, Instruction Cycle, Timing and Flowchart of Instruction cycle, State Transition Diagram of Instruction cycle, Types of Instructions, Addressing Modes in Computer, Examples on Addressing Modes in Computer, Examples in Instruction Execution.

CPU Execution Time, Average CPI of CPU and MIPS, Examples on CPU Performance,
CPU Performance Parameters, Amdahl's Law, Micro Operations of Instruction, Hardwired Control Unit, Wilkes Design for Microprogrammed Control Unit, Microprogrammed Control Unit, Comparison of Hardwired Control Unit and Microprogrammed Control Unit, Nano Programming, Microinstruction Format, Examples on Microinstruction Format, Examples on Control Unit, Registers Organization in RISC Processor,

Pipelining in Computer, Parameter's of Pipelining, Structural Hazards in Pipelining, Data Hazards in Pipelining, Control Hazards in Pipelining, Examples of Pipelining, Examples of Pipelining Hazards, CPI and Speed up in Pipelining with Hazards.

Signed Data Representation and Range of Signed Numbers in Computer, Examples on Number Representation, Normalization of Floating Point Number, IEEE 754 Single Precision Floating Point Number Representation, IEEE 754 Double Precision Floating Point Number Representation, Extreme Cases of Floating Point Representation in IEEE 754 Format, Examples on Floating Point Numbers, Half Adder and Full Adder, Ripple Carry Adder, Carry Look Ahead Adder, 4 bits Adder Subtractor, Booth's Algorithm, Examples on Booth's Algorithm, Restoring Division Algorithm, Non Restoring Division Algorithm.

System Bus basics, System Bus direction and interfacing with peripherals of computer, Bus Contention and Bus Arbitration techniques, Daisy Chain, Polling & Independent Request Bus Contention Methods.

Input Output Organization, Programmed IO, Interrupt Driven IO, Direct Memory Access - DMA, Examples on DMA.

Memory Organization in Computer, Locality of Reference, Spatial Locality and Temporal Locality, Average Access Time and Access Speed of Memory, Examples on Average Access Time and Access Speed of Memory, Cache Memory Organization, Direct Address Mapping in Cache Memory, Fully Associative Address Mapping in Cache Memory, Set Associative Address Mapping in Cache Memory, Replacement Strategies in Cache Memory, Updation Techniques in Cache Memory, Write Through Updation Technique in Cache Memory, Write Back Updation Technique in Cache Memory, Multi Level Cache Memory, Types of Misses in Cache Memory, Examples on Mapping of Cache Memory, Examples on Multi Level Cache Memory, Examples on Conflict Misses in Cache Memory.

Engineering Funda channel is all about Engineering and Technology. Here this video is a part of Computer Organization & Architecture.

#DirectMemoryAccess #ComputerArchitecture #ComputerOrganization @EngineeringFunda

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[santanukundu]

Your video lectures help me a lot for my semester exam . The way you teach is just awesome. I am very thankful to you 🙏.

[archithagowripeddi]

Your classes are really awesome sir...they helped a lot in my sem...tq very much sir🎉

[_ece_harshpathak]

Sir please make a video on analog circuit

[swathinayak]

Hello Sir,
i have some confusion with the concept you explained in this video.
Preparation time you told CPU is free to execute other programs (access to system bus), but before you explained:
1. as once the dma request is raised by IO(disk) to dma controller ->STEP 2,
2. the next step is dma controller will send hold request to CPU to get access for system bus ->STEP 3,
3. as part of STEP->4 we get the hold acknowledgement from CPU saying system bus is over to you(DMA Controller)
4. DMA sends the acknowledgement to IO to send the data to its buffer -> STEP5
5. STEP6 is basically preparation time were we get the data from IO to buffer...by the time CPU is already lost hold on system how CPU will be able to execute other programs could you please clarify my confusion
Thank You

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[santanukundu]

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[sharusharath]

sir can u share that ppt??
if u share that ppt then It will be very helpful to us