Path-based crosstalk fault test scanning in built-in self-testing

A crosstalk scanning system, comprising:

• one or more control cells each of which includes a functional scan register having a data input that is arranged as part of a first scan chain and wherein the functional scan register is arranged to provide an output in response to an input received from the first scan chain and a scanning control register having a control input wherein the scanning control register is arranged as part of a second scan chain that is arranged to provide an output when operating in a scan chain test mode that is arranged to selectively control the output of the functional scan register;
• wherein the scanning control register is arranged to be transparent when not operating in the scan chain test mode;
• a signal bus having nets each of which are driven by a respective output of the one of the one or more control cells;
• and
• one or more bus net receiver scan registers each of which includes a functional scan register having an input coupled to a respective net of the signal bus and that is arranged to provide an output to a third scan chain in response to an input received from the respective net of the signal bus.