Issue link: https://resources.pcb.cadence.com/i/1541046
30. Treating Length and Skew Matching as Numeric Constraints In high-speed digital systems (such as DDR, SERDES, PCIe, and parallel memory interfaces), timing margins are tight, and even small differences in trace length or delay can cause setup/hold violations, clock/ data misalignment, or bit errors. "Eyeballing" length or relying on layout symmetry is insufficient: you must treat length and skew as explicit, numeric constraints, grounded in the physical propagation delay of your PCB stackup. Enforcing these constraints in the layout tool and verifying compliance is essential for first-pass functional hardware and signal integrity. When And Where To Apply Apply numeric length and skew matching to all timing-critical nets: parallel data buses (DDR/SDRAM), differential pairs (SERDES, USB, Ethernet), clock/data lines, and high- speed digital/analog interfaces. Start before routing and maintain throughout placement, routing, and review. Differential pair skew matching techniques