GAL16V8 device modes — identifying supported operating modes Which of the following are valid operating modes for a GAL16V8 programmable logic device?

Introduction / Context:
GAL (Generic Array Logic) devices, such as the GAL16V8, are pin-compatible, fuse-map compatible successors to classic PALs with reprogrammability. They offer multiple operating modes to trade off I/O usage, product term resources, and sequential capability.

Given Data / Assumptions:

• GAL16V8 supports multiple personality modes.
• “Simple,” “Complex,” and “Registered” are common vendor-stated modes.
• Mode selection is determined by the design and fitter software.

Concept / Approach:
In Simple mode, outputs behave as straightforward combinational functions with abundant product term sharing. In Complex mode, macrocells offer richer control including output enable and more flexible product-term allocation. Registered mode dedicates macrocells to include flip-flops for synchronous designs, enabling counters and state machines directly in the device.

Step-by-Step Solution:

Verification / Alternative check:
Reference a GAL16V8 datasheet or fitter options; the three modes appear explicitly.

Why Other Options Are Wrong:
Each single-mode choice is incomplete; the device supports more than one mode.

Common Pitfalls:
Assuming PAL-like fixed personalities; GALs add flexibility via reprogrammable logic and multiple modes.

Final Answer:
All of the above