Electronic enthusiast network core tips : Presumably, everyone has heard of programmable logic devices (PLD), but do you still have an impression of simple PLD? The so-called "warming and knowing new", that electronic enthusiast network Xiaobian will come with everyone to understand what is simple PLD.
PLD, divided by integration, can be divided into simple PLD and complex PLD. Complex PLD is the FPGA and CPLD that we often hear now. We will only introduce simple PLD here.
Simple PLDs are low-integration chips that appeared in the early years, such as PROM, PAL, PLA, and GAL. Its main feature is that the number of logic gates that can be used for reconfiguration is less than 500 gates.
PROM (Programmable Read-Only Memory): A programmable read-only memory, also called One-TIme Programmable (OTP) ROM: A read-only memory that can be manipulated by a program. The main feature is that only data is allowed to be written once, and data entry errors can only be scrapped.
PAL (Programmable Array Logic) is a low-density, one-time programmable logic device first introduced by MMI in the late 1970s. It is the first programmable logic device with typical practical significance (PLD-Programmable). Logic Device). It uses a bipolar process and fuse programming. PAL is a field-programmable gate array logic device in EDA, and the internal circuitry is improved on a PLA basis.
The PLA is a programmable logic device that is programmable with an AND array and an OR array. The output circuit is not configurable, but is also called a field-programmable logic array (FPLA).
GAL - general array logic, English full name: generic array logic. The GAL device was discovered from PAL. The EECMOS process makes the device very easy to program. In addition, the logic design of the circuit is more flexible because its output uses the OLMC (Output Logic Macro Cell).
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