Graded Discussion Board
A Graded Discussion Board for Digital Logic and Design (CS302) will be opened on Wednesday 25 February, 2015 and it will be closed on Thursday 26 February 2015.
Discussion Topic
Programmable Logic devices can be used as replacement to logic gates and MSI chips, State that how these devices can have an effect on the performance of storage fundamentals, and also discuss which will give better performance? Give arguments in the support of your answer.Read the following instructions carefully before sending your comments:
- GDB will have weight-age of 5% of your total subject marks.
- Your discussion must be based on logical facts.
- You should post your comments on the Graded Discussion Board & not on the Regular MDB. Both will run parallel to each other during the time specified above.
- Your comments should be relevant to the topic i.e. clear and concise (Maximum 6-8 lines answer).
- Books, websites and other reading material may be consulted before posting your comments. (Do not copy the material as it is.)
- No extra time will be given for discussion.
- You cannot participate in the discussion after the due date or through e-mail.
Fixed Logic Versus Programmable Logic
ReplyDeleteLogic devices are often classified into 2 broad classes - fastened and programmable. because the name suggests, the circuits in a very fastened logic device square measure permanent, they perform one operate or set of functions - once factory-made, they can not be modified. On the opposite hand, programmable logic devices (PLDs) square measure commonplace, ready-to-wear components that provide customers a good vary of logic capability, features, speed, and voltage characteristics - and these devices are often modified at any time to perform any variety of functions.
With fastened logic devices, the time needed to travel from style, to prototypes, to a final producing run will take from many months to over a year, counting on the quality of the device. And, if the device doesn't work properly, or if the wants amendment, a brand new style should be developed. The up-front work of planning and substantiative fastened logic devices involves substantial "non-recurring engineering" prices, or NRE. NRE represents all the prices customers incur before the ultimate fastened logic device emerges from a semiconductor manufacturing plant, as well as engineering resources, high-priced package style tools, high-priced lithography mask sets for producing the assorted metal layers of the chip, and also the price of initial model devices. These NRE prices will run from many hundred thousand to many million greenbacks.
With programmable logic devices, designers use cheap package tools to quickly develop, simulate, and check their styles. Then, a style are often quickly programmed into a tool, and directly tested in a very live circuit. The PLD that's used for this prototyping is that the very same PLD that may be utilized in the ultimate production of a chunk of finish instrumentation, like a network router, a subscriber line electronic equipment, a videodisc player, or associate automotive navigation system. There are not any NRE prices and also the final style is completed a lot of quicker than that of a custom, fastened logic device.
Another key advantage of victimisation PLDs is that in the look section customers will amendment the electronic equipment as usually as they need till the look operates to their satisfaction. that is as a result of PLDs square measure supported re-writable memory technology - to vary the look, the device is solely reprogrammed. Once the look is final, customers will enter immediate production by merely programming as several PLDs as they have with the ultimate package style file.
Fixed logic devices and PLDs each have their blessings. fastened logic devices, as an example, square measure usually a lot of acceptable for big volume applications as a result of they will be factory-made a lot of economically. for sure applications wherever the terribly highest performance is needed, fastened logic devices might also be the most effective alternative.
ReplyDeleteHowever, programmable logic devices supply variety of necessary blessings over fastened logic devices, including:
A- PLDs supply customers far more flexibility throughout {the style|the planning|the look} cycle as a result of design iterations square measure merely a matter of fixing the programming file, and also the results of style changes are often seen directly in operating components.
B- PLDs don't need long lead times for prototypes or production components - the PLDs square measure already on a distributor's shelf and prepared for cargo.
C- PLDs don't need customers to buy giant NRE prices and get high-priced mask sets - PLD suppliers incur those prices once they style their programmable devices and square measure able to amortise those prices over the multi-year lifetime of a given line of PLDs.
D- PLDs permit customers to order simply the amount of components they have, once they would like them, permitting them to manage inventory. Customers WHO use fastened logic devices usually find yourself with excess inventory that should be scrapped, or if demand for his or her product surges, they'll be caught in need of components and face production delays.
E- PLDs are often reprogrammed even when a chunk of apparatus is shipped to a client. In fact, due to programmable logic devices, variety of apparatus makers currently tout the power to feature new options or upgrade merchandise that already square measure within the field. To do this, they merely transfer a brand new programming file to the PLD, via the web, making new hardware logic within the system.