Requirements

Time Synchronization

Vehicle Time synchronization		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__time__vehicle_time_sync
The score::time feature shall synchronize the local clock with an external Time Master using the gPTP protocol (IEEE 802.1AS).
feat_req__time__vehicle_time_sync		Feature Requirement

Vehicle Time synchronization precision		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__time__vehicle_time_sync
The score::time feature shall synchronize the local time, see feat_req__time__vehicle_time__sync, base with Time Master within a defined precision, based on the system setup. Note: the particular target precision depends on the system setup for AVB nodes the maximum difference in the synchronized time between two AVB ports/ECUs while both are in state SYNC, and could be 1 usec for non-AVB node the precision is relaxed, and could be 200-500 usec
feat_req__time__vehicle_time_sync_prec		Feature Requirement

Vehicle Time base API		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__time__vehicle_time_api
The score::time feature shall provide an API to access the synchronized vehicle time.
feat_req__time__vehicle_time_time_api		Feature Requirement

Vehicle Time base accuracy qualifier		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__time__vehicle_time_api
The score::time feature shall provide an API to read the accuracy qualifier of the local synchronized time base. Note: qualifier shall reflect the accuracy of the local time base, e.g. if it is synchronized to an external time source or not, are there any instabilities, like time jumps to the past or to the future does the time increase in a monotonic manner.
feat_req__time__vehicle_time_acc_qual_api		Feature Requirement

Vehicle Time base time point qualifier		status: valid security: NO safety: ASIL_B
reqtype: Functional satisfies: stkh_req__time__vehicle_time_api
The score::time feature shall provide an API to read the time point qualifier of the local synchronized time base. Note: qualifier shall reflect if the time point could be treated as ASIL-B data or QM data
feat_req__time__vehicle_time_time_pt_qual		Feature Requirement

Vehicle Time control flow		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__time__vehicle_time_api
The score::time feature shall provide an access its data via specified APIs in a fast and very efficient manner, avoiding, if possible, kernel calls, resource manager involvement and so on. For APIs see: feat_req__time__vehicle_time__time_api feat_req__time__vehicle_time__acc_qual_api feat_req__time__vehicle_time__time_pt_qual Use case: frequent access to the current synchronized time and its metadata by multiple clients within one ECU.
feat_req__time__vehicle_time_ctrl_flow		Feature Requirement

Vehicle Time synchronization logging		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__dev_experience__debugging
The score::time feature shall provide a mechanism to log the internal state of the synchronization process, to be able to debug and diagnose the synchronization process. Use case: Debugging and diagnostics of the time synchronization process.
feat_req__time__vehicle_time_sync_log		Feature Requirement

Time Synchronization to absolute external sources

score::time external synchronization		status: valid security: YES safety: QM
reqtype: Functional satisfies: stkh_req__time__absolute_time_sync
The score::time feature shall support synchronization with external time sources, such as UTC time from GPS.
feat_req__time__abs_sync		Feature Requirement

Absolute Time base API		status: valid security: YES safety: QM
reqtype: Functional satisfies: stkh_req__time__absolute_time_api
The score::time feature shall provide an API to read the absolute time base, synchronized to external time sources.
feat_req__time__abs_base_api		Feature Requirement

Absolute Time base accuracy qualifier		status: valid security: YES safety: QM
reqtype: Functional satisfies: stkh_req__time__absolute_time_api
The score::time feature shall provide an API to read accuracy qualifier of the absolute time base, synchronized to external time sources. Note: the inaccuracy could be indicated in the following manner Inaccuracy higher than 24h Inaccuracy less than 24h Inaccuracy less than 1h Inaccuracy less than 15min Inaccuracy less than 60s Inaccuracy less than 10s Inaccuracy less than 1s Inaccuracy less than 500ms Inaccuracy less than 100ms Inaccuracy less than 50ms Inaccuracy less than 10ms Inaccuracy not available
feat_req__time__abs_acc_qual		Feature Requirement

Absolute Time base security qualifier		status: valid security: YES safety: QM
reqtype: Functional satisfies: stkh_req__time__absolute_time_api
The score::time feature shall provide an API to read security qualifier of the absolute time base, synchronized to external time sources. Note: the security level might be indicated in the following steps No time available Time not trustworthy Time trustworthy Time very trustworthy
feat_req__time__abs_sec_qual		Feature Requirement

Absolute Time synchronization status log		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__dev_experience__debugging
The score::time feature shall provide a mechanism to log the internal state of the absolute time synchronization process, to be able to debug and diagnose the synchronization process.
feat_req__time__abs_sync_log		Feature Requirement

Local Clock

High precision clock API		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__time__high_precision_clock_api
The score::time feature shall provide an API to read the high precision clock in nanoseconds precision. Note: to which clock the high precision clock is mapped, depends on the system design. Use case: such clocks might be used for time-critical applications, such as audio/video streaming, event logging, and diagnostics.
feat_req__time__high_prec_clock_api		Feature Requirement

Monotonic clock API		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__time__monotonic_clock_api
The score::time feature shall provide an API to read monotonic, not adjustable clock value.
feat_req__time__monotonic_clock_api		Feature Requirement

Testability

score::time mocking APIs implementation		status: valid security: NO safety: QM
reqtype: Functional satisfies: stkh_req__dev_experience__mockup_public_apis
The score::time feature shall provide support for mocking its public interfaces, enabling unit, component and integration testing of applications.
feat_req__time__mocking_apis		Feature Requirement