1. Programmable Logic Devices
Lecture No. 21
Programmable Logic Devices

2. Recap PLA Device Implementing 0 and 1 Implementing Odd-Prime Number
GAL Operation
EECMOS cells
Programming PLDs

3. Recap
GAL22V10
OLMC
Combinational Mode
Registered Mode

4. GAL16V8 Emulate PALs three modes OLMC 8 inputs
2 special function inputs
8 outputs
8 sum-of-product terms
Each has 8 product terms
OLMC
Output control (4 options)
Feedback control (3 options)
OR gate output (programmed polarity)

5. GAL16V8 Simple Mode (3 options) Complex Mode (2 options)
Combinational Output (fig 1)
Combinational o/p with feedback (fig 2)
Dedicated Input (fig 3)
Complex Mode (2 options)
Combinational o/p (fig 4)
Combinational Input/output (fig 5)
Registered Mode

6. ABEL Acronym Advanced Boolean Expression Language
ABEL Boolean Operators and Notations (tab 1, 2)
Programming by Boolean expression
ABEL Boolean expression (fig 6)
Defining multiple Inputs/Outputs (tab 3 fig 7)
Defining sets (fig 8, 9)

7. ABEL Programming by Truth Table Test Vectors
XOR gate (fig 10)
Comparator (fig 11)
Comparator using sets (fig 12)
Test Vectors
Comparator (fig 13 14)
ABEL Input File three sections
Declarations (device, pin, set) (fig 15)
Logic Description

8. Implementing Quad MUX Quad 1-of-4 function table (tab 4)
ABEL Input file for the MUX (fig 16)
ABEL Implementation for MUX (fig 17)