Ripple and gated clocks: clock dividers, clock muxes, and other logic-driven clocks

If you have setup or hold violations for data paths going to or from the derived clock domain and the derived clock uses global routing, then try nonglobal routing.

There is a large delay associated with the global buffer. This delay contributes to clock skew for cross-domain data paths. The clock skew might be less with nonglobal routing than with global routing.

Nonglobal routing will cause some skew for paths within the derived-clock domain. In the post for design guideline# 3, see the discussion of on-die variation for nonglobal routing in clock paths.