Answering your questions about PAL, GAL, and PLA

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Some have heard of PAL, GAL, and PLA before but don’t understand what they are. To put it simply, these are electronic components that you are able to program. You can employ them to create digital circuits. Collectively, the complete family’s name is programmable logic device (PLD). People often ask us questions about these products. So we can help you understand them better, we are going to answer some here.

Circuits

One question we get quite often is “What type of circuits can you build into a PLD?”. Normally, you’re able to synthesise every digital circuit you can write as a sum of product and a few sequential circuits. The complexity will depend on the type of devices you are using, therefore giving you plenty of options.

Differences

Next, we’re going to reveal what the differences are between CPLD, GAL, PLA, and PAL. For the most part, they have different internal structures.

PLAs have more flexibility since they permit you to program the AND and OR matrices. With PALs, you can only program the AND matrix.

GALs have some features similar to PALs. However, there is the potential to erase and reprogram here.

The CPLD programmable logic devices are ones that unite distinct programmable cells. As a result you can implement circuits that are more complex.

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