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

How to configure Network file system version 4 (NFSv4) client?

By
69.How to configure Network file system version 4 (NFSv4) client? Ans. 1. There are two new options listed in NFSv4 are introduced as: clientaddr and ports 2. The version 3 of NFS introduced NFS over TCP, which improved NFS’s reliability. 3. In NFSv3, users use the mount option i.e., tcp as client whether client wants to use TCP or UDP to communicate with the server. NFSv4 replaces tcp or udp with a single option i.e. ports=tcp or udp 4. The default buffer size for NFSv4 is 8192 bytes, but it can grow to as large and by 32,678 bytes, which results performance improvements. 5. Following are the mount options: clientaddr=n – Declares client to be multihomed proto=type – Declares port as either udp or tcp resize=n – declares read size of clients buffer wsize=n – Declares write size of clients buffer sec=mod – Declares security model as either krb, krb5 etc.
Post a Comment
Read more

Absolute Links vs. Relative Links – SEO Value

By
Absolute Links vs. Relative Links – SEO Value The debate between  absolute links and relative links  continues to live on in the SEO world. The individual significance of each has been contested, but it is widely regarded that absolute links provide better SEO value on the whole than relative links. Many believe that absolute links have less potential for getting messed up when search engines index your page. It shouldn’t really make a difference, but many conclude that this is reason enough. Read more...
Post a Comment
Read more