Pinout knowledge check: GAL16V8 Consider the classic GAL16V8 programmable logic device in a 20-pin package. Evaluate the statement: “The GAL16V8 has eight dedicated input pins.”

Difficulty: Easy

Correct Answer: Correct

Explanation:


Introduction / Context:
The GAL16V8 is a widely used small PLD known for its flexible pin functions and compatibility with legacy PAL devices. Correctly recalling its pin roles is important when designing simple decoders, state machines, or glue logic.



Given Data / Assumptions:

  • Package is typically 20 pins with VCC and GND dedicated.
  • Eight pins serve as macrocells on the output/I/O side, and eight pins are dedicated inputs on the opposite side in the standard configuration.
  • Control pins (such as clock or OE, depending on mode) occupy specific locations.


Concept / Approach:
The canonical GAL16V8 pinout allocates pins 2–9 as dedicated inputs (eight total) and pins 12–19 as configurable macrocell I/O or outputs (again eight). This symmetry is the basis for the “16V8” naming convention: up to 16 input product-term capability and 8 output macrocells, with architectural details depending on the selected mode.



Step-by-Step Solution:

Recall that a 20-pin device reserves two pins for power (pin 20 VCC, pin 10 or 11 GND depending on variant).Identify the input side: eight dedicated input pins grouped together.Identify the output/I-O side: eight macrocells that can drive pins.Confirm that the count of dedicated inputs is eight, matching the statement.


Verification / Alternative check:
Cross-check with a manufacturer datasheet or a standard pinout diagram for GAL16V8; the eight inputs are consistently documented.



Why Other Options Are Wrong:
“Incorrect” would contradict the standard device organization central to how designers route signals with GAL16V8.



Common Pitfalls:
Confusing GAL16V8 with GAL22V10 (which has more macrocells and different pin roles) or assuming all pins are freely bidirectional, which is not true in dedicated-input positions.



Final Answer:
Correct

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