A pulse cannot be synchronized directly using 2 FF synchronizer. Toggle synchronizer is used to synchronize a pulse generating in source clock domain to destination clock domain. SpyGlass provides an integrated solution for analysis, debug and fixing with a comprehensive set of capabilities for structural and electrical issues all tied to the RTL description of design. Reset domain crossing sign-off tools & methodologies ensure the signals crossing the reset domains function reliably. Reset domain crossing (RDC) refers to a path in the design where the source & destination elements (flops, latches, clock gates) operate on different independent resets. CPPR is primarily due to OCV variations while CRPR is an architectural artifact. What is CPPR and CRPR?ĬPPR: CRP and CRP removal (CRPR) are often used synonymously with CPPR however, CRPR and CPPR should not be confused to be one and the same but rather two completely different perspective of clock path pessimism. In digital electronic design a clock domain crossing (CDC), or simply clock crossing, is the traversal of a signal in a synchronous digital circuit from one clock domain into another. the most common causes of CRP are reconvergent paths in clock network, and different min and max delay of cells in the clock network. Clock reconvergence pessimism = (maximum clock delay) – (minimum clock delay) What is Reconvergence clock?Ĭlock reconvergence pessimism (CRP) is a difference in delay along the common part of the launching and capturing clock paths. The amount of pessimism due to this effect (in this example, 0.2 ns) is called “clock reconvergence pessimism”. The value of this pessimism, is the difference between max and min delay at the common point in the clock network. It is also checked, that a valid synchronizer is present on the crossing. Crossings are verified against having combinational logic, convergence, or divergence. The CDC rules verify crossings between asynchronous clock domains. select of mux in a mux based synchronizer as it governs the crossing. A qualifier is a signal that controls/qualifies a crossing.
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