CPLDs
and FPGAs
The two major types of programmable logic
devices are field programmable gate arrays (FPGAs) and complex programmable
logic devices (CPLDs). Of the two, FPGAs offer the highest amount of logic
density, the most features, and the highest performance. The largest FPGA now
shipping, part of the Xilinx Virtex™ line of
devices, provides eight million "system gates" (the relative density
of logic). These advanced devices also offer features such as built-in
hardwired processors (such as the IBM Power PC), substantial amounts of memory,
clock management systems, and support for many of the latest, very fast
device-to-device signaling technologies. FPGAs are used in a wide variety of
applications ranging from data processing and storage, to instrumentation,
telecommunications, and digital signal processing.
CPLDs, by contrast, offer much smaller amounts
of logic - up to about 10,000 gates. But CPLDs offer very predictable timing
characteristics and are therefore ideal for critical control applications.
CPLDs such as the Xilinx CoolRunner™ series
also 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.
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