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Промоделируйте такую схему в timing simulation mode с включенной
опцией oscillation (5 nsec). Получите кучу предупреждений. Нажмите
HELP on Messages и почитайте.
...
Oscillation
An unstable logic level on a signal. When the Simulator is in timing or linked simulation mode, you can specify the time period that constitutes an oscillation and monitor the project for signals that do not stabilize within the defined period. When the Simulator is in functional simulation mode, you can monitor the project for nil-period oscillation only.
...
SUBDESIGN multiplier
(
clk : INPUT;
clk2 : OUTPUT;
)
BEGIN
clk2 = clk $ !LCELL(!clk);
END;
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