Understanding FPLA structure A Field-Programmable Logic Array (FPLA) is best characterized as which of the following?

Introduction / Context:
An FPLA is an early but important programmable logic architecture that predates large-scale FPGAs. Understanding its internal structure helps clarify differences between PLAs, PALs, and GALs, and why certain Boolean forms map efficiently to particular devices.

Given Data / Assumptions:

• FPLAs are configured electrically (for example, fuses/antifuses) and do not store user data like RAM.
• They include programmable AND and programmable OR planes.
• They are used to implement logic functions, not as general-purpose memory.

Concept / Approach:
In a PLA, both the AND and OR arrays are programmable. The AND plane generates product terms from inputs and their complements, and the OR plane sums any subset of those products to create outputs. Because configuration determines connectivity rather than stored user data, an FPLA is considered a nonmemory programmable logic device (its programmability defines logic structure, not runtime data storage).

Step-by-Step Solution:

Verification / Alternative check:
Textbook diagrams show both planes as programmable matrices with fusible links; device programming files specify which intersections are connected.

Why Other Options Are Wrong:

• Single-plane answers (only AND or only OR) are incomplete.
• Calling it memory-focused would misrepresent the device’s purpose.

Common Pitfalls:
Confusing PLAs (programmable OR+AND) with PALs (programmable AND + fixed OR) and assuming identical resource limits.

Final Answer:
All of the above