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1. (General) A device or feature within a device that provides a capability for monitoring or control, e.g. monitoring of device temperature or tuning of a SERDES link.
2. (IEEE 1687) Any on-chip circuit for test, debug, diagnosis, monitoring, characterization, configuration, or functional use that can be accessed by, configured from, or communicated with by an on-chip network described in Instrument Connectivity Language (ICL) that connects to an external device interface. An instrument is typically in a module that has only a client interface.
See also: Hierarchical Instrument
Source: 1. Internal, 2. IEEE P1687