Patent ID: 11921159
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. A device comprising:
a plurality of scan chains including inputs and outputs;
a decompressor coupled to the inputs of the plurality of scan chains;
a masking circuit coupled to the outputs of the plurality of scan chains;
a multiplexer including an input, wherein the multiplexer also includes an output coupled to the masking circuit, and wherein the multiplexer is configured to independently select at least one scan chain of the plurality of scan chains for qualification;
a shift register coupled to the decompressor, wherein the shift register includes a plurality of cells, and wherein each cell in the plurality of cells is configured to select some of the plurality of scan chains corresponding to the respective cell for qualification or disqualification in tandem; and
a plurality of bit-field decoders, wherein each bit-field decoder of the plurality of bit-field decoders includes:
an input coupled to a respective cell of the plurality of cells; and
an output coupled to the multiplexer.