Digital Electronics - Programmable Logic Device - Discussion
Discussion Forum : Programmable Logic Device - General Questions (Q.No. 9)
9.
Each programmable array logic (PAL) gate product is applied to an OR gate and, if combinational logic is desired, the product is ORed and then:
Discussion:
1 comments Page 1 of 1.
Afreen said:
11 months ago
After the OR operation, the result is often sent to an inverter. This inversion step is crucial for several reasons:
Implementation of Negative Logic: Many logic systems require both the original signal and its complement (inverse). The inverter allows the PAL to directly implement both forms of logic without requiring additional external components.
Standard Output Form: PAL devices often have active-low outputs, meaning the signal is low when the output is "true" (logic 1). This is commonly used in digital circuits, especially in control signals where active-low logic is preferred.
Implementation of Negative Logic: Many logic systems require both the original signal and its complement (inverse). The inverter allows the PAL to directly implement both forms of logic without requiring additional external components.
Standard Output Form: PAL devices often have active-low outputs, meaning the signal is low when the output is "true" (logic 1). This is commonly used in digital circuits, especially in control signals where active-low logic is preferred.
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