IEEE 1149.1 JTAG boundary‑scan standard

E1466

IEEE standard boundary-scan standard electronic test standard

The IEEE 1149.1 JTAG boundary-scan standard is a widely used test and debug specification that defines a serial interface and architecture for accessing and testing the internal logic and interconnects of integrated circuits and circuit boards.

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All labels observed (19)

Label	Occurrences
JTAG	15
IEEE 1149.1	6
IEEE 1149.1 boundary-scan standard	3
IEEE 1149.1 JTAG specification	2
IEEE 1149.1 boundary-scan architecture	2
EXTEST instruction	1
IEEE 1149.1 JTAG boundary‑scan standard canonical	1
IEEE 1149.1 Test Access Port	1
IEEE 1149.1 boundary-scan	1
IEEE 1149.1 boundary-scan chains	1
IEEE 1149.1 test access port	1
IEEE 1149.1 test access port (TAP)	1
IEEE Standard Test Access Port and Boundary-Scan Architecture	1
JTAG boundary-scan	1
JTAG boundary-scan architecture	1
JTAG boundary-scan group	1
JTAG interface	1
TAP (Test Access Port)	1
boundary-scan register	1

How this entity was disambiguated

This entity first appeared as the object of triple T12939 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: IEEE 1149.1 JTAG boundary‑scan standard
Context triple: [IEEE Standards Association, develops, IEEE 1149.1 JTAG boundary‑scan standard]

A. IRE Transactions on Circuit Theory
IRE Transactions on Circuit Theory was a peer-reviewed scientific journal published by the Institute of Radio Engineers that focused on theoretical and analytical aspects of electrical and electronic circuits.
B. IRE Transactions on Electron Devices
IRE Transactions on Electron Devices was a peer-reviewed scientific journal published by the Institute of Radio Engineers that focused on research in electron and semiconductor devices, later continuing as part of the IEEE Transactions series.
C. IEEE Electron Devices Society
The IEEE Electron Devices Society is a professional society within IEEE that focuses on the theory, design, fabrication, and application of electron and semiconductor devices.
D. IEEE 1394
IEEE 1394 is a high-speed serial bus interface standard, commonly known as FireWire, used for real-time data transfer between digital devices such as computers, cameras, and audio/video equipment.
E. IRE Transactions on Space Electronics and Telemetry
IRE Transactions on Space Electronics and Telemetry was a specialized scientific journal published by the Institute of Radio Engineers focusing on research in space electronics, telemetry, and related communication technologies.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: IEEE 1149.1 JTAG boundary‑scan standard
Target entity description: The IEEE 1149.1 JTAG boundary-scan standard is a widely used test and debug specification that defines a serial interface and architecture for accessing and testing the internal logic and interconnects of integrated circuits and circuit boards.

A. IRE Transactions on Circuit Theory
IRE Transactions on Circuit Theory was a peer-reviewed scientific journal published by the Institute of Radio Engineers that focused on theoretical and analytical aspects of electrical and electronic circuits.
B. IRE Transactions on Electron Devices
IRE Transactions on Electron Devices was a peer-reviewed scientific journal published by the Institute of Radio Engineers that focused on research in electron and semiconductor devices, later continuing as part of the IEEE Transactions series.
C. IEEE Electron Devices Society
The IEEE Electron Devices Society is a professional society within IEEE that focuses on the theory, design, fabrication, and application of electron and semiconductor devices.
D. IEEE 1394
IEEE 1394 is a high-speed serial bus interface standard, commonly known as FireWire, used for real-time data transfer between digital devices such as computers, cameras, and audio/video equipment.
E. IRE Transactions on Space Electronics and Telemetry
IRE Transactions on Space Electronics and Telemetry was a specialized scientific journal published by the Institute of Radio Engineers focusing on research in space electronics, telemetry, and related communication technologies.
F. None of above. chosen

Statements (54)

Predicate	Object
instanceOf	IEEE standard ⓘ boundary-scan standard ⓘ electronic test standard ⓘ
alsoKnownAs	IEEE 1149.1 ⓘ linked to: IEEE 1149.1 JTAG boundary‑scan standard JTAG ⓘ linked to: IEEE 1149.1 JTAG boundary‑scan standard JTAG boundary-scan ⓘ linked to: IEEE 1149.1 JTAG boundary‑scan standard
appliesTo	digital integrated circuits ⓘ printed circuit boards ⓘ
architectureType	serial scan chain ⓘ
category	design for testability ⓘ
defines	IDCODE register ⓘ TAP controller ⓘ Test Access Port ⓘ boundary-scan architecture ⓘ boundary-scan register ⓘ bypass register ⓘ instruction register ⓘ serial test access port interface ⓘ test data registers ⓘ
definesOptionalSignal	TRST ⓘ
definesSignal	TCK ⓘ TDI ⓘ TDO ⓘ TMS ⓘ
field	digital integrated circuits ⓘ electronic design automation ⓘ printed circuit board testing ⓘ
fullName	IEEE Standard Test Access Port and Boundary-Scan Architecture ⓘ linked to: IEEE 1149.1 JTAG boundary‑scan standard
hasFeature	boundary-scan cells on digital I/O pins ⓘ chaining of multiple devices in a scan path ⓘ control of output pins via scan chain ⓘ non-intrusive observation of pin states ⓘ
introducedConcept	boundary-scan cell ⓘ test access port ⓘ
publishedBy	IEEE Standards Association ⓘ Institute of Electrical and Electronics Engineers ⓘ
purpose	board-level interconnect testing ⓘ debug access to internal logic ⓘ in-system programming of devices ⓘ in-system test of integrated circuits ⓘ
relatedStandard	IEEE 1149.4 ⓘ linked to: IEEE 1149.6 IEEE 1149.6 ⓘ IEEE 1149.7 ⓘ IEEE 1532 ⓘ
specifies	finite state machine for TAP controller ⓘ
status	widely adopted in semiconductor industry ⓘ
supports	BYPASS instruction ⓘ EXTEST instruction ⓘ linked to: IEEE 1149.1 JTAG boundary‑scan standard IDCODE instruction ⓘ PRELOAD instruction ⓘ SAMPLE instruction ⓘ
usedFor	field diagnostics ⓘ hardware debug ⓘ manufacturing test ⓘ

How these facts were elicited

Referenced by (42)

Full triples — surface form annotated when it differs from this entity's canonical label.

IEEE Standards Association → develops → IEEE 1149.1 JTAG boundary‑scan standard ⓘ

IEEE 1149.1 JTAG boundary-scan standard → alsoKnownAs → IEEE 1149.1 ⓘ

subject linked to: IEEE 1149.1 JTAG boundary‑scan standard