Edge-Triggered Shift Register Latch for Single Scan Clock Tree

The patent applies preliminary action by generating a compensated clock signal in advance to offset anticipated timing delays. The delay compensation circuit pre-calculates and pre-adjusts the clock signal timing based on expected path variations, ensuring that all SRLs are triggered synchronously despite different physical distances from the clock source. This prevents data flush-through by ensuring master and slave latches are triggered at the correct relative times before data propagation occurs.

The patent merges the functions of multiple clock trees into a single clock distribution network. Instead of maintaining separate A-clock, B-clock, and C-clock trees, the invention combines their synchronization function into one clock tree with a delay compensation circuit that provides the necessary timing adjustments. This consolidation reduces wiring complexity and on-chip space while maintaining the synchronized triggering of master and slave latches through intelligent signal timing rather than physical separation.

The patent applies local quality by introducing delay compensation specifically where needed in the clock distribution path, rather than forcing uniform path lengths across the entire chip. The delay compensation circuit is placed locally at strategic points in the clock tree to adjust timing for specific regions or SRLs that experience varying path delays. This allows the rest of the device layout to maintain flexibility and optimal area utilization while only the necessary local regions receive timing adjustments.