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Page 1: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

Programmable Array Logic (PAL) is a family of programmable logic device semiconductors used to implement logic functions in digital circuits introduced by Monolithic Memories

PROGRAMMABLE ARRAY LOGIC

Page 2: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

Programmable

ANDarray

FixedOR

array

N input

product term

Out puts

Page 3: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

The connection in AND array is programmable and in OR array is not .

It has n i/p line which is given to the buffer Buffer are connected to the i/p of the AND

gate programmable link Output of the gate is then fed to the OR

array With fixed connection. All the output of the AND array is not

connected to the OR array

Page 4: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

In PAL only AND array is programmable but in PLA both AND and OR array are programmable

Main difference b/t PAL and PLA

Page 5: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

A complex programmable logic device (CPLD) is a programmable logic device with complexity between that of PALs and FPGAs, and architectural features of both.

COMPLEX PROGRAMMABLE

LOGIC DEVICES

Page 6: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

STRUCTURE OF CPLDI/PBLOCK

PALLIKE

BLOCK

PALLIKE

BLOCK

I/PBLOCK

INTERCONNECT WIRE

I/PBLOCK

PALLIKE

BLOCK

PALLIKE

BLOCK

I/PBLOCK

Page 7: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

CPLDs are the extension of the PAL concept

It consist of number of pal like logic block has a programmable AND array that feed macro cell and the output of these macro cell can be rooted to the input of the other logic block within the same ic’s

Page 8: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

CPLDs are electrically erasable and reprogrammable .

CPLD is non-volatile and can be programmed by –

- design entry and simulation - transforming the programing information generated by CAD system through cable from computer to CPLD

Features

Page 9: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

A field-programmable gate array (FPGA) is an integrated circuit designed to be configured by a customer or a designer after manufacturing—hence "field-programmable".

FIELD PROGRAMMABLE GATE ARRAY

Page 10: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2
Page 11: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

Most commonly used logic block is a look up table, which contain storage cell that are used to implement a small logic function.

Each cell is capable of holding a single value either zero or one

Page 12: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

Consumer product like dvd player

Controller circuit for automobile

Internet router, network switches

Application

Page 13: PROGRAMMABLE LOGIC DEVICES PATR 2 OF 2

THANKS


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