Determining a length of the instruction register of an...

Details Determining a length of the instruction register of an... Determining a length of the instruction register of an...

2007-03-20

2009-10-27

Tabone, Jr., John J (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

C714S727000, C714S729000

Reexamination Certificate

active

07610534

ABSTRACT:
Methods and systems are provided for determining a total length of instruction registers. A data shift of a scan chain determines whether each device in the scan chain is an identified device. An overall length of the instruction registers of the devices is determined from an instruction shift. An actual position is determined for an identified device between each pair of sub-sequences of unidentified devices. An instruction shift of the scan chain attempts to set the respective instruction register of the identified device using one or more trial positions. If a data shift of the scan chain obtains the recognized value of the respective identification register of the identified device for one of the trial positions, then this trial position is the actual position within the overall length. The total length is determined for the instruction registers of the unidentified devices in each sub-sequence of the unidentified devices.

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