67. Design 4-bit right shift register using D FF

Sequential Right Shift Logic: A shift registers functions as a cascading pipeline where memory entries move linearly through interconnected storage cells at specified pacing intervals.

Synchronous Cascade Propagation: Linking the output pin (Q_n) of an upstream D flip-flop directly into the input terminal (D_n-1) of a downstream stage ensures immediate sequential passing on active edge instances.

Positive-Edge Clock Bus Routing: A synchronized distribution bus distributes the clock line uniformly across all active nodes, forcing simultaneous data captures across the system.

Memory State Isolation: When the clock line is static or exhibits a falling transition (↓), the internal configurations are preserved, protecting data from unwanted fluctuations.

Bit Positioning Tracking: The serial entry point (D) dictates the newer states of the primary stage (Q3), while the remaining nodes pass on historical values toward lower significance branches (Q0).