Quartus

Design Assistant warning: <Register output should not drive register's control signal directly or through combinatorial logic>. Found <number> combinatorial loops related to this rule.


CAUSE: In the current design, the Design Assistant found the specified number of combinatorial loops where the output of a register directly drives one of its own control signals (for example, the register's preset signal or asynchronous load signal), or the output of the register drives combinatorial logic that drives one of the register's control signals. However, these combinatorial loops can cause significant stability and reliability problems in a design. The submessage(s) of this message list the combinatorial loop(s) that the Design Assistant found.
ACTION: Make sure the register outputs do not drive their own control signals directly or through combinatorial logic.

See also:

Analyzing Designs with the Design Assistant
Register Output Should Not Drive Register's Control Signal Directly or Through Combinatorial Logic

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