Serial-in/parallel-out (SIPO) shift register — does it move data “from one parallel bus to another” through a single serial line? Consider a classic SIPO register. It accepts data on a single serial input line under clocking and then presents the accumulated bits simultaneously on multiple output lines. Evaluate the claim that a SIPO “transfers data from one parallel data bus to another parallel data bus one bit at a time across a single line.”

Introduction / Context: Shift registers are versatile building blocks for data movement and temporary storage in digital systems. Two common types are PISO (parallel-in/serial-out) and SIPO (serial-in/parallel-out). This question probes whether a SIPO by itself “moves data from one parallel bus to another” via a single wire, which is a subtle but important point for system designers.

Given Data / Assumptions:

• SIPO has one serial input, a shift clock, and multiple parallel outputs.
• Transferring data between parallel buses typically implies parallel capture at the source and parallel presentation at the destination.
• No additional stages (like a PISO at the source) are explicitly included in the statement.

Concept / Approach: A SIPO converts a serial stream into a parallel word. To move a word from a parallel source bus onto a single serial line first, you need a PISO at the source to serialize it. Then a SIPO at the destination deserializes it back to parallel. A SIPO alone does not perform parallel-to-parallel transfer; it only performs serial-to-parallel conversion.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

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