MAX7000S interconnect capacity into a LAB: In an Altera MAX7000S device, up to how many signals can feed a single Logic Array Block (LAB) from the Programmable Interconnect Array (PIA)?

Introduction / Context:
In CPLDs such as the MAX7000S family, routing resources determine how many external signals can reach each Logic Array Block (LAB). Understanding these limits is crucial for fitting logic equations and ensuring that the fitter can legally route all required signals into the target LAB.

Given Data / Assumptions:

• MAX7000S architecture uses a central PIA feeding multiple LABs.
• Each LAB contains multiple macrocells that share incoming signals.
• There is a published maximum number of signals that can feed a LAB.

Concept / Approach:
Routing limits cap the number of distinct signals available to implement wide combinational functions or to share signals among macrocells. Designers must watch fan-in requirements and may need to repartition logic if they exceed per-LAB input availability.

Step-by-Step Solution:

Verification / Alternative check:
Older MAX7000S technical briefs and fitter reports show the per-LAB input ceiling and flag overuse when exceeded.

Why Other Options Are Wrong:

Common Pitfalls:
Forgetting that even if device-wide I/O is sufficient, per-LAB routing limits can still prevent a legal fit; overlooking product-term borrowing cannot bypass LAB input limits.

Final Answer:
36