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FSW Requirement 5.3.10.1.3 (prev, next)

Req. 5.3.10.1.3: "GRB Interrupt from GBM Forwarded by SC"

The SIU FSW shall be able to accept a GRB interrupt from the GBM instrument on a discrete line, for inclusion in the telemetry stream. Although the SIU FSW will service this interrupt, no further action is specifically required for the LAT FSW development effort. Based on future on-orbit discovery, the FSW may be modified to provide a more extensive response to this signal. Further details are provided in [11].

Basis (help)

[2] (3.2.6.5.2.1, 3.2.7)

    2: "LAT Instrument - Spacecraft Interface Requirements Doc." (NASA 433-IRD-0001)

      3.2.6.5.2.1: "Immediate Trigger Signal"

      The LAT receives a single pulse from the GBM for each burst detected by the GBM as described in section 3.2.7.

      3.2.7: "IMMEDIATE TRIGGER SIGNAL"

      The LAT shall receive a burst trigger signal routed from the GBM across an LVDS interface via the SC harness.

      3.2.7.1: "Immediate Trigger Signal Frequency"

      The Immediate Trigger Signal shall occur at a rate defined in the LAT-GBM ICD.

      3.2.7.2: "Immediate Trigger Signal Characteristics"

      The Immediate Trigger Signal characteristics shall be defined in the LAT-GBM ICD.

      3.2.7.3: "Reserved"

      Requirement Deleted.

      3.2.7.4: "Immediate Trigger Signal Redundancy"

      The Trigger Signal interface shall provide cross-strapping redundancy between the GBM and the LAT. (i.e. Both Side A and Side B of the GBM interface to both Side A and Side B of the LAT.)

    11: "LAT-GBM Interface Control Doc." (NASA 433-ICD-0001)

Context (help)

Test(s)

    011: GRB Handling/Repointing Requests

    This test shall verify that the SIU FSW correctly handles and responds to GRB alerts and repointing requests from both the ground and the GBM (via the SC). Verification shall include a variety of scenarios, including repointing enable, different operational modes, and conflicting requests. The test shall verify that the SIU FSW responds to these alerts and requests properly, rejecting the appropriate ones and forwarding repointing requests to the SC for the other cases.