Patent ID: 11927633
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The device of claim 1, wherein the device is configured to operate in a scan in phase, in a capture phase, and in a scan out phase,
wherein in the scan in phase:
the plurality of storage elements of the scan chain are loaded responsive to a scan clock signal and a scan in signal;
the shadow shift register is loaded responsive to the scan clock signal and the scan output of the one of the storage elements of the scan chain; and
the value of the shadow shift register is latched before the capture phase;

wherein in the capture phase, the signature register is loaded responsive to a signature clock signal and a signature data signal; and
wherein in the scan out phase, the plurality of storage elements of the scan chain are unloaded through the output buffer responsive to the scan clock signal and responsive to the latched value of the shadow shift register being equal to the value of the signature register.