Notice: Payments for answers will end 4/10/2017. Click for more info.
You have new items in your feed. Click to view.
Question and answer
Q: What is the purpose and technique of DMA logic?
A: Direct memory access (DMA) is a feature of modern computers that allows certain hardware subsystems within the computer to access system memory independently of the central processing unit (CPU). Without DMA, [ when the CPU is using programmed input/output, it is typically fully occupied for the entire duration of the read or write operation, and is thus unavailable to perform other work. With
DMA, the CPU initiates the transfer, does other operations while the transfer is in progress, and receives an interrupt from the DMA controller when the operation is done. This feature is useful any time the CPU cannot keep up with the rate of data transfer, or where the CPU needs to perform useful work while waiting for a relatively slow I/O data transfer. Many hardware systems use DMA, including disk drive controllers, graphics cards, network cards and sound cards. DMA is also used for intra-chip data transfer in multi-core processors. Computers that have DMA channels can transfer data to and from devices with much less CPU overhead than computers without a DMA channel. Similarly, a processing element inside a multi-core processor can transfer data to and from its local memory without occupying its processor time, allowing computation and data transfer to proceed in parallel. ]
Expert answered|CroneDocuro|Points 20|
Question
Asked 10/1/2012 3:44:03 PM
0 Answers/Comments
Get an answer
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
26,439,635 questions answered
Popular Conversations
What is the solution to the proportion? n/18 = 5/9 A. n = 2.5 B. n ...
Weegy: n/18 = 5/9; 9n = 5 * 18 9n = 90 n = 90/9 n = 10
10/12/2017 10:59:55 AM| 8 Answers
Which of the following has kinetic energy? a. a rock poised for a ...
Weegy: A bow that is drawn back by an archer. B. Has kinetic energy.
10/10/2017 2:00:05 PM| 3 Answers
In which one of the following sentences is a word misspelled? ...
Weegy: The sentence with a spelling mistake is: User: Which of the following is an example of an imperative sentence? ...
10/9/2017 8:45:54 AM| 2 Answers
Which of the following about the double-exposition concerto form is ...
Weegy: The development avoids the tonic is TRUE about the double-exposition concerto form. User: The first section ...
10/9/2017 11:33:19 AM| 2 Answers
In which sentence is the underlined phrase an adjective ...
Weegy: The sentence with an adjective clause is: User: . In which sentence is the underlined clause an adjective ...
10/10/2017 11:55:36 AM| 2 Answers
What country is John Hus from?
10/11/2017 11:05:31 AM| 2 Answers
The two infinitive functions are adjectives and noun. true or faslse
Weegy: The two infinitive functions are adjectives and noun. TRUE.
10/11/2017 11:35:51 AM| 2 Answers
Weegy Stuff
S
P
P
L
P
P
P
Points 137 [Total 2029] Ratings 11 Comments 27 Invitations 0 Offline
S
P
L
Points 97 [Total 119] Ratings 0 Comments 97 Invitations 0 Offline
S
Points 63 [Total 63] Ratings 4 Comments 23 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
L
Points 1 [Total 100] Ratings 0 Comments 1 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.