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tutorial9_4 - Elec 151 Tutorial #9 Lab 5_1: ORCAD PLD Tools...

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1 Outline : • Lab 5_1: Orcad PLD Tools using VHDL design entry - PLD - PAL - VHDL - VHDL Examples Elec Elec Elec 151 Tutorial #9 151 Tutorial #9 2 Design and Implementation using PLD Fill in the True Table Understand the design Use K-MAP Find out the simplified Boolean expressions Output = f (Inputs) * Circuit design & Implementation (Lab 5_1) : Convert the expressions into Logic Gates, represent the circuit using VHDL file and fit them into a PLD (use ORCAD PLD) * Physical Implementation (Lab 5_2) : Program the PLD and test it Design flow * denotes new steps Lab 5_1: ORCAD PLD Tools using VHDL design entry 3 Programmable Logic Devices (PLD) PLD : General purpose IC’s that can be customized to implement specific complex functions in a very little space (reducing the component count). Customization : Is done by programming (by blowing internal fuses to achieve desired function) : Is achieved by using an array of AND and OR (or NOR and NAND). Types of PLD : PROM (Programmable Read-Only Memory) PLA (Programmable Logic Array) PAL (Programmable Array Logic) GAL (Generic Array Logic): reprogrammable PLD, used in the lab. 4 Where: denotes “a fuse that can be blown” denotes “a predetermined connection” PAL commonly used notation (shown before programming) A B C F 0 F 1 F 2 F 3 Shows all possible connections between inputs and gates prewired at the factory. See : (i) Programmable AND array , but constrained (fixed) OR array ! (ii) Also : There is no fuse in OR array!
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5 AB C A F + = _ 1 AB C B F + = _ _ 2 A C B F + = _ 3 _ _ 0 C B A F + = Where: denotes “a fuse” denotes “a predetermined connection” …PAL commonly used notation (shown after programming) A B C AB C B _ _ C A _ _ C B A F 0 F 1 F 2 F 3 _ _ C B AB A 0 0 6 e.g. GAL20V8 Also There can be feedbacks from outputs 7 Pre-Lab (i) Read through the lab outline carefully. (ii)
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tutorial9_4 - Elec 151 Tutorial #9 Lab 5_1: ORCAD PLD Tools...

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