Transition detection circuitry and method of detecting a transition of a signal occurring within a timing window

A method of generating an error signal indicating detection of a transition in an input signal occurring within a timing window, comprising:

• generating, by pulse generation circuitry, a pulse signal in response to a transition in the input signal;
• asserting an error signal on detection of the pulse signal;
• controlling, by pulse control circuitry, a property of the pulse signal dependent on a timing window indication signal;
• when the pulse signal is generated at least partly while the timing window indication signal is set, controlling the property of the pulse signal such that the pulse signal is detected;
• and
• when the pulse signal is entirely generated while the timing window indication signal is cleared, controlling the property of the pulse signal such that the pulse signal is undetected;
• wherein the pulse control circuitry comprises transistor circuitry forming one of a pull-down path and a pull-up path within the pulse generation circuitry, the pulse control circuitry being turned off while the timing window indication signal is set.

Transition detection circuitry comprising:

• pulse generation means for receiving an input signal and for generating a pulse signal in response to a transition in the input signal;
• and
• pulse detection means for asserting an error signal on detection of the pulse signal generated by the pulse generation means;
• the pulse generation means having pulse control means for controlling a property of the pulse signal dependent on a timing window indication signal;
• the pulse control means, when the pulse signal is generated at least partly while the timing window indication signal is set, for controlling the property of the pulse signal such that the pulse signal generated by the pulse generation means is detected by the pulse detection means;
• and
• the pulse control means, when the pulse signal is entirely generated while the timing window indication signal is cleared, for controlling the property of the pulse signal such that the pulse signal generated by the pulse generation means is undetected by the pulse detection means;
• wherein the pulse control means comprises transistor circuitry forming one of a pull-down path and a pull-up path within the pulse generation means, the pulse control means being turned off while the timing window indication signal is set.