October 2006
Intermediate to advanced
544 pages
14h 29m
English
Content preview from Digital Systems
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Chapter 21
CPLDs and FPGAs
OBJECTIVE
We will learn in this chapter about CPLDs and FPGAs. These are advanced high-density field-programmable devices.
21.1 CPLDS
The PROM, PLA and PAL (PLDs) are programmable logic devices for combinational circuits. Following are the needs observed when designing the various application circuits:
- The output from the OR gate(s) is sometimes needed in complement form.
- Sometimes an output is needed through a tristate or tristate NOT form also. [Figure 21.1(a)]. Tristate output (s) enables the output availability on a common bus from several sources.
- Sometimes an output with or without complementing (or both) is needed to be feedback to an input of the same stage to a previous stage or next stage. [Refer lower ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.