Removable and replaceable TAP domain selection circuitry

Details Removable and replaceable TAP domain selection circuitry Removable and replaceable TAP domain selection circuitry

2007-04-03

2007-04-03

Britt, Cynthia (Department: 2138)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

Reexamination Certificate

active

10983256

ABSTRACT:
Today many instances of IEEE 1149.1 Tap domains are included in integrated circuits (ICs). While all TAP domains may be serially connected on a scan path that is accessible external to the IC, it is generally preferred to have selectivity on which Tap domain or Tap domains are accessed. Therefore Tap domain selection circuitry may be included in ICs and placed in the scan path along with the Tap domains. Ideally, the Tap domain selection circuitry should only be present in the scan path when it is necessary to modify which Tap domains are selected in the scan path. The present invention describes a novel method and apparatus which allows the Tap domain selection circuitry to be removed from the scan path after it has been used to select Tap domains and to be replaced back into the scan path when it is necessary to select different Tap domains.

REFERENCES:
patent: 6073254 (2000-06-01), Whetsel
patent: 2005/0138503 (2005-06-01), Whetsel
Texas Instruments IEEE Std 1149.1 (JTAG) Testability Primer 1997 Semiconductor Group.

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