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12. 7-12 © Dr. Alaaeldin Amin Signal Attributes Attributes Are Named Characteristics of an Object (or Type) Which has a Value That Can Be Referenced. SIGNAL ATTRIBUTES S`Event -- Is TRUE if Signal S Has Changed. S`Stable(t) -- Is TRUE if Signal S Has Been Stable For the Last ``t`` Period. If t=0; it is written as S`Stable S`Last_value -- Returns the Previous Value of ``S`` Before the Last Change. Examples : An Edge-Triggered D-FF D_FF: PROCESS(CLK) Begin IF (CLK`Event and CLK = `1`) Then Q <= D After TDelay; END IF; END Process;