Quartus

Design Assistant warning: <Design should not contain SR latches>. Found <number> SR latch(es) related to this rule.


CAUSE:

In the current design, the Design Assistant found the specified number of SR latches, which are structures where two NOR or NAND gates (which the Quartus II software implements in logic cells) are cross-coupled using combinatorial loops that drive the output of one gate to an input of the other gate. SR latches can cause glitches and ambiguous timing in a design, which makes timing analysis of the design more difficult.

NOTE The Design Assistant also generates this rule for SR latches that are part of more sophisticated latches that the Design Assistant cannot identify.

The submessage(s) of this message list the SR latch(es) that the Design Assistant found.

ACTION: Remove the SR latches from the design.

See also:

Analyzing Designs with the Design Assistant
Design Should Not Contain SR Latches

- PLDWorld -

 

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