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Unformatted text preview: 1 Elec Elec Elec Elec Elec Elec Elec Elec 151 Tutorial #10 151 Tutorial #10 151 Tutorial #10 151 Tutorial #10 151 Tutorial #10 151 Tutorial #10 151 Tutorial #10 151 Tutorial #10 Outline : • Lab 5_1: Orcad PLD Tools using VHDL design entry – Post Lab- Post Lab: PROM, PLA, PAL, GAL- GAL20V8A- Analyzing the LST and JED files for the 2-Bit Adder Lab 5_2: Programmable Logic Devices (PLD)- Lab 5_2 main steps 2 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) Reduction of component count & space : 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) 3 Memory Array (programmable) 2 n words by m bits (OR array) Decoder (AND array) 1 2 3 4 . . n n inputs (addresses) 1 2 3 4 . . 2 n 2 n minterms = 2 n word lines (fixed) F1 F2 Fm m output lines PROM Is normally used as a memory device (e.g. BIOS) Advantage : PROM can...
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- Spring '10