درس مدارهای منطقی دانشگاه قم Programmable Logic (PAL, PLA) تهیه شده توسط حسین امیرخانی مبتنی بر اسلایدهای درس مدارهای منطقی دانشگاه.

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درس مدارهای منطقی دانشگاه قم Programmable Logic (PAL, PLA) تهیه شده توسط حسین امیرخانی مبتنی بر اسلایدهای درس مدارهای منطقی دانشگاه امیرکبیر

Symbols for OR gate 2

3 PLA (Programmable Logic Array)

4 PLA A 3×2 PLA with 4 product terms

5 PLA  Pre-fabricated building block of many AND/OR gates (or NOR, NAND)  General purpose logic building blocks  “Personalized” or “customized” by making/ breaking connections among the gates  This process is called “programming”

6 PLA Sums of Products

7 Design for PLA: Example  Implement the following functions using PLA Personality Matrix 1 = asserted in term 0 = negated in term - = does not participate Input Side: 1 = term connected to output 0 = no connection to output Output Side: OutputsInputsProduct term A B C F F F F A B B C A C B C A

8 Personality Matrix OutputsInputsProduct term A B C F F F F A B B C A C B C A Design for PLA: Example

9 Constants  Sometimes a PLA output must be programmed to be a constant 1 or a constant 0.  Manufacturer MAY pull up the AND inputs: − P1 is always 1 is pulled UP or HIGH. − This constant 1 term drives the O1 output.  Manufacturer MAY pull down the OR inputs: − O2 is 0.  Anot her method of obtaining a constant-0 output is shown for O3.

10 PAL (Programmable Array Logic) Sums of Products but with a fixed OR array

11 PAL inputs 1 st output section 2 nd output section 3 rd output section 4 th output section Only functions with at most four products can be implemented

12

13 PAL W = ABC + CD X = ABC + ACD + ACD + BCD Y = ACD + ACD + ABD x x x

14

Final Remark 15 A Programmable Logic achieves higher flexibility at the cost of lower speed!

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