Parallel in / parallel out (PIPO) register structure: Judge the statement: “A parallel in/parallel out register provides parallel input and parallel output buses for multi-bit words.”

Introduction / Context:
Registers are classified by how data enters and exits: serial-in/serial-out (SISO), serial-in/parallel-out (SIPO), parallel-in/serial-out (PISO), and parallel-in/parallel-out (PIPO). PIPO registers are useful whenever an entire word must be captured and later presented simultaneously. This item asks if a PIPO device actually has parallel input and output buses.

Given Data / Assumptions:

• “Parallel” implies multiple bits transferred at the same time.
• PIPO captures an N-bit word on load/clock and outputs all N bits together.
• Word width depends on the specific device (4, 8, 16, etc.).

Concept / Approach:
By design, PIPO devices expose N input pins (often D0..DN-1) and N output pins (Q0..QN-1). With a load or clock edge, the input word is sampled and then appears concurrently on the output bus, enabling quick data movement between subsystems without serializing.

Step-by-Step Solution:

Verification / Alternative check:
Typical PIPO devices, including 74HC273 or similar, show N D-inputs and N Q-outputs with timing diagrams for parallel capture and update.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing PIPO with PISO/SIPO; forgetting that propagation and clock-to-Q delays still apply to “parallel” transfers.

Final Answer:
Correct