PAL structure versus PROM: In a PAL, the AND array is programmable while the OR array is fixed (hard-wired). Assess the accuracy of the statement comparing PAL and PROM internal AND/OR structures.

Introduction / Context: Programmable logic families differ primarily in which internal arrays (AND or OR) are field-programmable. Understanding these differences is key when choosing devices for sum-of-products logic implementations and product-term budgeting.

Given Data / Assumptions:

• PROMs have a fixed AND (decoder) array and a programmable OR array.
• PALs (Programmable Array Logic) feature a programmable AND array and a fixed (hard-wired) OR array.
• FPLAs/PLAs typically have both AND and OR arrays programmable.

Concept / Approach: The question asserts the classic textbook distinction: PAL → programmable AND, fixed OR. PROM → fixed AND (as a decoder), programmable OR fuses. Recognizing this mapping lets designers predict resource use and optimal device choice.

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