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Categories >> Software >> Embedded Systems >> 86 Family
 
 


 

 
 86 Family interview questions  86 Family Interview Questions (53)
 VLSI interview questions  VLSI Interview Questions (200)
 DSP interview questions  DSP Interview Questions (9)
 Embedded Systems AllOther interview questions  Embedded Systems AllOther Interview Questions (24)
Question
What happens during DMA transfer?
 Question Submitted By :: Nalini C K
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What happens during DMA transfer?
Answer
# 1
during dma transfer the processor is going with its current
processes and not involved with the data transfers ,since it
already released its buses the for that ...
 
Is This Answer Correct ?    20 Yes 5 No
Geo
 
  Re: What happens during DMA transfer?
Answer
# 2
During DMA transfers DMA manager takes control of the
transfer of data from specified source address to
destination address. 1D-1D or 1D-2D or 2D-1D or even 2D-2D
transfers are usually possible. During this time processor
is free to perform other operations - which are independent
of the impending transfer being performed.

http://www.vinaymk.com/tutorials
 
Is This Answer Correct ?    13 Yes 3 No
Vinay M K
 
 
 
  Re: What happens during DMA transfer?
Answer
# 3
DMA means Direct memory access which is used to share the
bulk of data without involving of microprocessor. in this
process the microprocessor will be idle and it uses +5V
power supply.
 
Is This Answer Correct ?    28 Yes 2 No
Raghu
 
  Re: What happens during DMA transfer?
Answer
# 4
At the time of DMA operation the micro processor can do any
other task
 
Is This Answer Correct ?    9 Yes 13 No
Aromal
 
  Re: What happens during DMA transfer?
Answer
# 5
the processor can do any task other task during dma operation 
Is This Answer Correct ?    0 Yes 14 No
Justin
 
  Re: What happens during DMA transfer?
Answer
# 6
During dma operation data tranfer takes place directly to
the peripheral devices,MPU releases the control of the
buses to the dma controler and two new signals are comes
into existence,(1)hold (2)hlda(hold acknowledge)
 
Is This Answer Correct ?    12 Yes 2 No
Ravi
 
  Re: What happens during DMA transfer?
Answer
# 7
THE DMA use the data bus and the microprocessor is not
involved but during this time it can do other tasks which
do not require the data bus such as ALU operation,..
 
Is This Answer Correct ?    7 Yes 5 No
Umuntu
 
  Re: What happens during DMA transfer?
Answer
# 8
The CPU communicates with the DMA through the address and
data buses as with any interface unit. The DMA has its own
address, which activates the DS and RS lines. The CPU
initialize the DMA through the data bus. Once the DMA
receives the start control command, it can start the
transfer between the peripheral device and the memory
 
Is This Answer Correct ?    2 Yes 0 No
Padmapriya.c
 
  Re: What happens during DMA transfer?
Answer
# 9
DMA (Direct Memory Access) is a technique that transfers
data between a microprocessor's memory and an I/O device
without involving the microprocessor.

* Working process of DMA controller:

1. The I/O device request DMA operation via the DMA request
lines of the controller chip.

2. The controller chip activates the microprocessor HOLD
pin, requesting the CPU to release the bus.

3. The processor then sends HLDA (Hold Acknowledgement) back
to the DMA controller.

4. The DMA controller completes the DMA transfer and
releases the bus.
 
Is This Answer Correct ?    3 Yes 0 No
Niaz Mohammad
 

 
 
 
Other 86 Family Interview Questions
 
  Question Asked @ Answers
 
load a mul a store t1 load b mul b store t2 mul t2 add t1 then the content in accumulator is Wipro 2
Design a divide-by-3 sequential circuit with 50% duty circle?   1
Why is data bus bi-directional? Wipro 6
What are tri-state devices and why they are essential in a bus oriented system? Keane-India-Ltd 1
What is the difference detween ISR & function call Bosch 16
What are the different Adder circuits you studied?   6
Give the truth table for a Half Adder, Give a gate level implementation of the same? Wipro 4
Design any FSM in VHDL or Verilog?   2
What is the difference between MOV and MVI?   14
8085 is how many bit microprocessor?   18
Return address will be returned by function to Wipro 1
Draw a Transmission Gate-based D-Latch?   1
 
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