On the other hand, programmable logic devices (PLDs) are standard, off-the-shelf parts that offer customers a wide range of logic capacity, features, speed, and voltage characteristics - and these devices can be changed at any time to perform any number of functions. And, if the device does not work properly, or if the requirements change, a new design must be developed. With fixed logic devices, the time required to go from design, to prototypes, to a final manufacturing run can take from several months to more than a year, depending on the complexity of the device. Fixed Logic DevicesĪs the name suggests, the circuits in a fixed logic device are permanent, they perform one function or set of functions - once manufactured, they cannot be changed. Logic devices can be classified into two broad categories - fixed and programmable. Some CPLDs require extremely low amounts of power and are very inexpensive, making them ideal for cost-sensitive, battery-operated, portable applications such as mobile phones and digital handheld assistants. But CPLDs offer very predictable timing characteristics and are therefore ideal for critical control applications. CPLDs, by contrast, offer much smaller amounts of logic - up to about 10,000 gates. Memory cells control and define the function that the logic performs and how the various logic functions are interconnected.įPGAs are used in a wide variety of applications ranging from data processing and storage, to instrumentation, telecommunications, and digital signal processing. PLDs provide specific functions, including device-to-device interfacing, data communication, signal processing, data display, timing and control operations, and almost every other function a system must perform. Programmable logic devices (PLD) are designed with configurable logic and flip-flops linked together with programmable interconnect.
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