PROGRAMMABLE LOGIC DEVICES (PLD) UNIT-IV

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PROGRAMMABLE LOGIC DEVICES (PLD) UNIT-IV

PLD Problems by Using Basic Gates Many components on PCB: As no. of components rise, nodes interconnection complexity grow exponentially Growth in interconnection will cause increase in interference, PCB size, PCB design cost, and manufacturing time

PLD The purpose of a PLD device is to permit elaborate digital logic designs to be implemented by the user in a single device. Can be erased electrically and reprogrammed with a new design, making them very well suited for academic and prototyping Types of Programmable Logic Devices SPLDs (Simple Programmable Logic Devices) ROM (Read-Only Memory) PLA (Programmable Logic Array) PAL (Programmable Array Logic) GAL (Generic Array Logic) CPLD (Complex Programmable Logic Device) FPGA (Field-Programmable Gate Array)

PLD The first three varieties are quite similar to each other: They all have an input connection matrix, which connects the inputs of the device to an array of AND-gates. They all have an output connection matrix, which connect the outputs of the AND-gates to the inputs of OR-gates which drive the outputs of the device. The gate array is significantly different and will be described later.

PLD The differences between the first three categories are these: 1. In a ROM, the input connection matrix is hardwired. The user can modify the output connection matrix. In a PAL/GAL the output connection matrix is hardwired. The user can modify the input connection matrix. In a PLA the user can modify both the input connection matrix and the output connection matrix.

General structure of PLDs.

Buffer/inverter (a) Symbol. (b) Logic equivalent.

Programming by blowing fuses. (a) Before programming. (b) After programming.

OR - PLD Notation

AND - PLD Notation

PROM Notation

Using a PROM for logic design (a) Truth table. (b) PROM realization.

A simple four-input, three-output PAL device.

An example of using a PAL device to realize two Boolean functions. (a) Karnaugh maps. (b) Realization.

Exclusive-or-gate with a programmable fuse (a) Circuit diagram. (b) Symbolic representation.