Skip to main content

what is DMA? Explain the working principle of DMA.

By
•DMA is a technique for transferring blocks of data directly between two hardware devices.

 •In the absence of DMA the processor must read the data from one device and write it to the other one byte or word at a time.

 •DMA Absence Disadvantage: If the amount of data to be transferred is large or frequency of transfer is high the rest of the software might never get a chance to run.

 •DMA Presence Advantage: The DMA Controller performs entire transfer with little help from the Processor.

Comments

Post a Comment

Popular posts from this blog

Java,ES,QT practical files

By
All practical files: Click below to start download Uploaded on special request||||
2 comments
Read more

Vidyalankar Question paper solutions

By
Download from their website: http://www.vidyalankar.org/index.aspx or just click here to download
1 comment
Read more

Explain network classes.

By
43.Explain network classes. Ans. 1. TCP/IP network are 4 bytes long, called IP addresses and written in dotted-decimal notation. (ex. 192.168.166.5) 2. The decimal numbers must be within the numeric range of 0-255, each IPv4 addresses consist of 4 parts. 3. Each part should conform to the 1-byte requirement. 4. Depending on the value of the first byte of the address, IP addresses can be divided into classes. 5. Network classes are of 3 type and have some specific range • Class A 0-127 • Class B 128-191 • Class C 192-233 6. Class division enables us efficient use of the address numbers. 7. Assigned network numbers are maintained in a database managed by InterNIC to insure that each assignment is unique. 8. After obtaining a network number, the host numbers may be assigned as required, for data transfer ARP maps the IP address to the MAC address of the device. 9. Routers are used for transferring data between 2 devices, routers are default gateway ...
Post a Comment
Read more