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.
26,902,775 questions answered
*
Get answers from Weegy and a team of really smart lives experts.
Popular Conversations
What does astrologer mean?
5/11/2018 12:51:16 PM| 4 Answers
Speed sign is an example of a _________ sign A. regulatory B. ...
Weegy: A diamond shaped sign is a WARNING sign.
5/13/2018 5:01:49 PM| 3 Answers
3. Simplify 12 – (–8) × 4 = ? A. 16 B. 80 ...
Weegy: 12 - (-8)*4 User: 5. Evaluate m + n2 if we know m = 2 and n = –2. A. –8 B. 8 C. 6 ...
5/11/2018 8:21:14 AM| 2 Answers
17. 7 × (–3) × (–2)2 = ? A. 84 B. –48 C. ...
Weegy: 7 * (-3) * (-2)^2 User: 19. Multiply (2m + 3)(m2 – 2m + 1). A. 2m3 – m2 – 8m + 3 B. 2m3 ...
5/11/2018 8:49:43 AM| 2 Answers
Solve the equation: 12y = 132.
Weegy: 12y=132 User: If 3 times a number minus 2 equals 13, what is the number? A. 5 B. 4 ...
5/11/2018 8:57:51 AM| 2 Answers
Strike-slip fault
Weegy: In a strike-slip fault, the rocks on either side of the fault slip past each other sideways. TRUE.
5/17/2018 3:51:47 PM| 2 Answers
You can short-circuit the buildup of rage when driving by ...
Weegy: One way to reduce the buildup of rage while driving is to: adjust the air conditioner to keep yourself cool.
5/18/2018 6:55:28 PM| 2 Answers
Self-doubt is a result of
5/12/2018 1:31:33 PM| 2 Answers
when colonists boycotted british goods under the stamp act they
Weegy: Most Americans called for a boycott of British goods, and some organized attacks on the customhouses and homes ...
5/13/2018 12:01:56 PM| 2 Answers
S
R
L
R
P
R
Points 203 [Total 645] Ratings 0 Comments 23 Invitations 18 Offline
S
L
Points 188 [Total 199] Ratings 0 Comments 188 Invitations 0 Offline
S
L
Points 119 [Total 119] Ratings 0 Comments 19 Invitations 10 Offline
S
1
L
L
P
R
P
L
P
P
R
P
R
P
R
P
Points 90 [Total 13175] Ratings 0 Comments 80 Invitations 1 Offline
S
Points 30 [Total 30] Ratings 0 Comments 0 Invitations 3 Offline
S
Points 14 [Total 14] Ratings 0 Comments 14 Invitations 0 Offline
S
Points 13 [Total 13] Ratings 0 Comments 3 Invitations 1 Offline
S
Points 13 [Total 13] Ratings 0 Comments 13 Invitations 0 Offline
S
Points 11 [Total 11] Ratings 1 Comments 1 Invitations 0 Offline
S
Points 11 [Total 11] Ratings 1 Comments 1 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.