MAX7000S device interconnect architecture: Evaluate the statement — “All inputs to an Altera MAX7000S device and all macrocell outputs feed the Programmable Interconnect Array (PIA).”

Introduction / Context:
CPLD families such as Altera’s MAX7000S use a central interconnect fabric—the Programmable Interconnect Array (PIA)—to route signals between I/O pins and logic macrocells. Understanding this fabric clarifies how signals are shared, how product terms are allocated, and how global resources integrate across the device.

Given Data / Assumptions:

• Device family: MAX7000S.
• Macrocells implement sum-of-products with optional registers.
• PIA is the central routing matrix.

Concept / Approach:
In this architecture, external inputs (from I/O pins) and macrocell outputs are all made available to the PIA. The PIA then programmably distributes these signals to other macrocells’ product terms and to I/O blocks as needed, enabling flexible interconnect without board-level rewiring.

Step-by-Step Solution:

Verification / Alternative check:
Device block diagrams show I/O pins and macrocell outputs feeding a central interconnect. Fitter reports list PIA resource usage when signals are routed across function blocks.

Why Other Options Are Wrong:

• Incorrect / Only I/O feed PIA / Only macrocells feed PIA: Each omits part of the architecture; both sources feed the PIA.
• Depends on global clocks: Clock networks are separate from general interconnect and do not affect whether signals feed the PIA.

Common Pitfalls:
Assuming point-to-point fixed wiring; overlooking PIA capacity and routing delays; not accounting for PIA when analyzing timing closure.

Final Answer:
Correct