FPGA Ch1_3

أعزائى القراء المحترمين 

السلام عليكم ورحمة الله وبركاته 

 أقدم لكم اليوم المدونة الثالثة في مقدمة عن مصفوفة البوابات المنطقية القابلة للبرمجة في مجال العمل (Field  Programmable Gate Array  FPGA ).

Chapter 1

1.4     Custom-Design Chips

    PLD Programmable Logic Devices are available as of shelf components that can be purchased from different suppliers. Because they are programmable, they can be used to implement most logic circuits found in digital hardware. However, PLDs also have a drawback in that the programmable switches consume valuable chip area and limit the speed of operation of implemented circuits. Those in some cases PLDs may not meet the desired performance or cost objectives. In such situations it is possible to design a chip from scratch; namely, the logic circuitry that must be included on the chip is designed first and then an appropriate technology is chosen to implement the chip.

 Finally, the chip is manufactured by a company that has the fabrication facilities. This approach is known as custom or semi-custom design, and such chips are called custom or semi-custom chips. Such chips are intended for use in specific applications and are sometimes called application-specific integrated circuits (ASICs).

   The main advantage of the custom chip is that it is designed can be optimized for a specific task; hence it usually leads to better performance.

    A disadvantage of the custom design approach is that manufacturing a custom chip often takes a considerable amount of time, on the order of months. In contrast, if a PLD can be used instead, then the chips are programmed by the end user and no manufacturing delays are involved.

   

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