ACIS Software Traceability

MASSACHUSETTS INSTITUTE OF TECHNOLOGY
CENTER FOR SPACE RESEARCH
CAMBRIDGE, MASSACHUSETTS 02139

REVISION LOG TITLE: DOC. NO.
Software Requirements Traceability Matrix 36-02402

Revision Date
(mm/dd/yy)
ECO
No.
Page(s)
Affected
Reason Approval
01 -/-/- - All PDR Release
02 05/18/95 - All CDR Release


# Reference Requirement Description
[CEI Rev 06]
Test
Meth
Team Test Objectives References to
SRS Rev B

CEI 3.1.3 Science Modes




CEI 3.1.3.1 CCD Readout Modes



1 CEI 3.1.3.1-1 Simultaneous reading of a minimum of 6 data streams from spectral or imaging CCDs D5 QA Verify that all (6 imaging & 6 spectroscopy) CCD's are supplying data in timed exposure RAW mode.
3.2.2.3.19 Table 16 Table 17



D5 QA Verify that each science run is uniquely identified.
3.2.1.3.12



D5 QA Verify that the number of exposures is correct.
3.2.1.3.12
2 CEI 3.1.3.1-2 "Each channel shall collect data from CCDs at max rate 166,666 12 bit words / sec" T7 HW Design tests to verify that the CCDs can maintain the commanded data rate. Verify that the pixels are being copied to the FEP image memories, that overclocks are being extracted and stored, and that vertical retrace interrupts are being sent to the FEPs. TBD

CEI 3.1.3.1 a) Timed Exposure Mode



3 CEI 3.1.3.1 a)-1 Be able to command exposure time between 0.1 and 10 sec R8 SW Inspect Detailed Design Specification to check that the times have been implemented.
3.2.2.3.1 , Table 11



D5 QA Verify that command times of 0.1, 0.2, 5.0, 9.9 and 10.0 seconds are included in tests. Inspect ACIS time tags in their output streams.
3.2.2.3.1
4 CEI 3.1.3.1 a)-2 Image to Framestore operation take -- 60 msec T7 HW This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A
5 CEI 3.1.3.1 a)-3.i Framestore read operation < 6.5 sec T7 HW This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A
6 CEI 3.1.3.1 a)-3.ii Be able to read less than a full frame (sub frame) R8 SW Inspect the Detailed Design Specification to verify that this mode has been implemented.
3.2.2.3.1 , Table 11



D5 QA Prepare tests of raw-mode and event-mode timed- exposure sub-frame readout and verify that the frame intervals are correct and that the reported coordinates (event-mode only) are within the sub-frame limits.
3.2.2.3.1 , Table 11
7 CEI 3.1.3.1 a)-3.iii Sub frame shall be rectangular S1 QA Refer to CEI 3.1.3.1 a)-3.ii N/A
8 CEI 3.1.3.1 a)-3.iv "Sub frame read out normal rate, skipped pixels at faster rate" T7 HW Inspect output from sub-frame readout tests to see whether pixel skipping has resulted in faster readout times.
3.2.2.3.1 , Table 11

CEI 3.1.3.1 b) Continuous Readout Mode



9 CEI 3.1.3.1 b)-1-i Be able to read from a maximum of 2 CCDs D5 QA Develop 2 raw continuous-clocking mode tests, one using 2 imaging CCDs the other using 2 spectros copy CCDs. (See CEI 3.1.3.1 b)-1-ii) . Examine the resulting telemetry packets for the presence of events from both CCDs.
3.2.3.3.1 , Table 26
3.2.3.3.17 , Table 30
10 CEI 3.1.3.1 b)-1-ii Be able to read from a max of 2 CCDs within 6.2 msecs D5 QA Use the results of the CEI 3.1.3.1 b)-1-i tests: inspect the output time tags to validate the readout time.
3.2.3.3.1 , Table 26
3.2.3.3.17 , Table 30
11 CEI 3.1.3.1 b)-2 Be able to sum a commandable number of lines prior to readout D5 SW Prepare and execute continuous mode tests with a varying number of on-CCD summed lines.
3.2.3.3.1 , Table 26
3.2.3.3.17 , Table 30

CEI 3.1.3.1 c) Diagnostic Checkout Mode



12 CEI 3.1.3.1 c)-1 Be able to reverse clock each CCD's serial regis ter D5 HW Prepare and execute raw timed-exposure and contin uously clocked tests, selecting the "diagnostic" out put register clocking mode. Compare the reported overclock averages against the raw pixel averages.
3.2.5.3.2

CEI 3.1.3.2 Data Processing Modes




CEI 3.1.3.2 a) Event Mode



13 CEI 3.1.3.2 a)-a-1-i Identify candidate X-ray events V4 QA Refer to CEI 3.1.3.2 a)-a-1-iii N/A
14 CEI 3.1.3.2 a)-a-1-ii Remove detector bias & dark current artifacts A2 SW "CCD Bias Level Determination Algorithms" , Somigliana and Ford, MIT ACIS, Release 2, May 30, 1995. Verify efficiency and accuracy of bias calibration using "image loader" and selected test images (from CD-R set). See reference .
3.2.2.3.1 , Table 11
3.2.2.3.24 , Table 25




QA Use an Fe 55 source with full-frame illumination at a range of fluxes. Compare the results with data col lected by the high-speed tap component of EGSE.
3.2.2.3.1 , Table 11
3.2.2.3.24 , Table 25
15 CEI 3.1.3.2 a)-a-1-iii "Extract event location, time, and energy" D5 SW Verify pixel location, time, and energy in timed- exposure faint event mode during SW integration tests, using "image loader" and test images (from CD-R set).
3.2.2.3.1 , Table 11
3.2.2.3.21 , Table 20



D5 QA Use an Fe 55 source with full-frame illumination at a range of fluxes. Compare the results with data col lected by the high-speed tap component of EGSE.
3.2.2.3.1 , Table 11
3.2.2.3.21 , Table 20
16 CEI 3.1.3.2 a)-a-1-iii Format extracted information for telemetry I3 SW Verify reported events in timed-exposure faint event mode during SW integration tests, using "image loader" and test images (from CD-R set).
3.2.2.3.1 , Table 11
3.2.2.3.21 , Table 20
17 CEI 3.1.3.2 a)-a-2 Processing of data will not degrade extracted information D5 SW Verify reported events in timed-exposure faint event mode and in graded mode during SW integration tests, using "image loader" and test images (from CD-R set).
3.2.2.3.1 , Table 11
3.2.2.3.21 , Table 20
3.2.2.3.23 , Table 24

CEI 3.1.3.2 a)-a-3 Determination of candidate event centers



18 CEI 3.1.3.2 a)-a-3-i Pixel event thresholds shall be commandable D5 SW Verify effect of varying event thresholds in timed- exposure faint event mode using "image loader" & test images (from CD-R).
3.2.2.3.1 , Table 11
3.2.2.3.21 , Table 20
19 CEI 3.1.3.2 a)-a-3-ii Pixels with bias correction amplitudes exceeding event threshold... A2 SW Verify correct threshold logic in timed-exposure faint bias mode during SW integration tests, using "image loader" and test images (from CD-R set).
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
20 CEI 3.1.3.2 a)-a-3-iii ... and are local maxima relative to 8 nearest neighboring pixels D5 SW Verify correct local maxima logic in timed-exposure faint bias mode during SW integration tests, using "image loader" and test images (from CD-R set).
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
21 CEI 3.1.3.2 a)-b Detector bias levels accounted for in bias and dark current removal T7 SW Verify correct bias computation and its later use in timed-exposure faint bias mode during SW integra tion tests, using "image loader" and test images (from CD-R set).
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
3.2.2.3.24 , Table 25

CEI 3.1.3.2 a)-c-1 Telemetry consist of 2 sub-modes




CEI 3.1.3.2 a)-c-2 Faint sub-mode



22 CEI 3.1.3.2 a)-c-2 Transmits all pixel information including loca tion and 9 amplitudes D5 SW Verify that 9 pixel values and their locations are being accurately reported, using "image loader" & test images (from CD-R).
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
23 CEI 3.1.3.2 a)-c-5 All candidate events shall be telemetered D5 SW Verify that all "good" events are being reported in timed-exposure faint bias mode, using "image loader" & test images (from CD-R).
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22



D5 QA Use calibration software within the EGSE to verify that "good" events are being reported.
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22

CEI 3.1.3.2 a)-c-3 Bright sub-mode



24 CEI 3.1.3.2 a)-c-3-i Transmits pixel location and amplitudes at lower resolution D5 SW Compare "faint" and "bright" modes, using "image loader" & test images (from CD-R). Verify that the same events are reported when bright-mode grading is turned off.
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
3.2.2.3.23 , Table 24
25 CEI 3.1.3.2 a)-c-4 Loss of spatial distribution and amplitude events is acceptable A2 SW Compare tests of "faint" and "bright" modes, using "image loader" & test images (from CD-R). Verify that the "bright" mode amplitudes are derived according to the algorithms in reference [1].
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
3.2.2.3.23 , Table 24
26 CEI 3.1.3.2 a)-c-6 Grades shall be assigned to candidate events D5 SW Compare tests of "faint" and "bright" modes, using "image loader" & test images (from CD-R). Request various bright-mode grades and split threshold amplitudes and verify that the expected events are reported.
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
3.2.2.3.23 , Table 24
27 CEI 3.1.3.2 a)-c-7 Grade shall be a function of amplitude and spa tial distribution S1 SW Refer to CEI 3.1.3.2 a)-c-6 N/A
28 CEI 3.1.3.2 a)-c-8 Grade shall distinguish between valid and back ground X-ray events R8 SW Compare tests of "faint" and "bright" modes, using "image loader" & test images (from CD-R). Check that specific "background event" pixel patterns are removed by particular BEP grades.
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
3.2.2.3.23 , Table 24
29 CEI 3.1.3.2 a)-c-9 Be able to select events on basis of grade D5 SW Compare tests of "faint" and "bright" modes, using "image loader" & test images (from CD-R). Verify that width and intensity of particular spectral lines, e.g. O K , Mn K , are affected by choice of grade.
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
3.2.2.3.23 , Table 24
30 CEI 3.1.3.2 a)-c-10-i Grade selection criteria shall be adjustable D5 SW Design a test to verify that grades can be selected a both ends of the specified range.
3.2.2.3.1 , Table 11
3.2.2.3.23 , Table 24
31 CEI 3.1.3.2 a)-c-10-ii Possible to include all grade events in telemetry I SW This is the same test as CEI 3.1.3.2 a)-c-3-i N/A

CEI 3.1.3.2 a)-d Event timing



32 CEI 3.1.3.2 a)-d-i Accurate to within 1 AXAF-I clock pulse T7 HW This is primarily a hardware calibration issue the stability of the DEA-start and FEP-exposure latches must be tested. These can be verified by comparing latch times for various DEA settings in parameter blocks.
3.2.1.3.9
3.2.2.3.1 , Table 11
3.2.2.3.21 , Table 21
33 CEI 3.1.3.2 a)-d-ii Relatable to AXAF I clock D5 SW This is a design concern, not a validation issue. The relation required by the CEI Specification results from the MHz clock latches.
3.2.1.3.9
3.1.4.6 , Figure 14
3.2.2.3.1 , Table 11
3.2.2.3.21 , Table 21

CEI 3.1.3.2 a)-e Capable of continuous operation with events described as follows:



34 CEI 3.1.3.2 a)-e.i) Contains -- 1000 pixels < threshold/sec/CCD data stream T7 SW Prepare tests in graded event mode that determine the behavior of BEP and more than one FEP when the simulated event rate exceeds 1000 pixels/sec/ FEP.
3.2.2.3.1 , Table 11
3.2.2.3.11
3.2.2.3.23 , Table 24



T7 QA Verify this behavior when real CCDs are used in place of the "image loader" .
3.2.2.3.1 , Table 11
3.2.2.3.11
3.2.2.3.23 , Table 24
35 CEI 3.1.3.2 a)-e.ii) Total valid X-ray event rate in all 6 CCD data streams of -- 750 events/sec D5 SW Use the same test configuration as CEI 3.1.3.2 a)-e.i) and verify that at least 750 events are reported.
3.2.2.3.1 , Table 11
3.2.2.3.11
3.2.2.3.23 , Table 24



T7 QA Verify this behavior when real CCDs are used in place of the "image loader" .
3.2.2.3.1 , Table 11
3.2.2.3.11
3.2.2.3.23 , Table 24

CEI 3.1.3.2 b) Timing Mode




CEI 3.1.3.2 b)-1 Mode used to process data in continuous read out mode



36 CEI 3.1.3.2 b)-2 Amplitude and position info compressed to fit telemetry limits D5 SW During continuous readout tests, verify that pixel values and locations are accurately represented in the output stream.
3.2.3.3.1 , Table 26
3.2.3.3.18 , Table 32
37 CEI 3.1.3.2 b)-3 Data to be time-stamped at least every major frame I3 QA Inspect output from a continuous readout test, and verify that sufficient frame latch tags are being reported, i.e. >= one per 32 seconds.
3.2.3.3.1 , Table 26
3.2.3.3.18 , Table 32

CEI 3.1.3.2 c) Bright Source Imaging Mode



38 CEI 3.1.3.2 c)-1 "Loss of temporal, spatial, or spectral resolution employed to fit telemetry rates" D5 SW During the CEI 3.1.3.2 a)-e.i) and ii) tests, verify that, if a FEP is unable to keep up with the input data rate, entire frames are skipped by all FEPs.
3.2.3.3.1 , Table 26
3.2.3.3.18 , Table 32
39 CEI 3.1.3.2 c)-2 Processing shall terminate if output data rate exceeds 24 kbps S1 SW Refer to CEI 3.1.3.2 c)-1. N/A
40 CEI 3.1.3.2 c)-3 Processing shall not resume until buffer overflow is eliminated S1 SW Refer to CEI 3.1.3.2 c)-1. N/A
41 CEI 3.1.3.2 c)-4 Buffer size and overflow actions TBD TBD SW Verify during CEI 3.1.3.2 a)-e.i) and CEI 3.1.3.2 a)- e.i) testing that FEP and BEP buffer sizes ( TBD until HW CDR) are adequate to meet CEI requirements.
3.2.2.3.1 , Table 11
3.2.2.3.11
3.2.2.3.23 , Table 24

CEI 3.1.3.2 d) Bright Source Spectroscopy Mode



42 CEI 3.1.3.2 d)-1 Provide specialized data compression for TGS observations A2 SW Verify two-exposure-time operation in timed-expo sure faint event mode during SW integration tests, using "image loader" and test images (from CD-R set).
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
43 CEI 3.1.3.2 d)-2 Compression shall preserve X-ray intensity as a function of position N/A N/A Since the compression is in the time domain, and is non-destructive, this requirement is automatically met. N/A

CEI 3.1.3.2 e) Calibration and Diagnostic Modes



44 CEI 3.1.3.2 e)-1 All calibration modes shall function when ACIS is at focus or next in line for focus D5 SW Verify that bias maps can be computed, and raw his togram mode executed in next-in-line mode (500 baud telemetry).
3.2.2.3.20 , Table 18
3.2.2.3.24 , Table 25
45 CEI 3.1.3.2 e)-2 Full telemetry will be utilized D5 SW Verify that ACIS telemetry packets use optimal bit- packing.
3.2.1.3.10



D5 SW Verify that bias maps and raw pixels are compressed efficiently (see reference [1]).
3.2.2.3.19 , Table 20
3.2.2.3.24 , Table 25
3.2.3.3.17 , Table 30



D5 QA During all tests, tally the percentage of telemetry that is unused, i.e. contains inter-packet pad bytes.
46 CEI 3.1.3.2 e)-2-i "Mode must provide information on system per formance, noise, CCD charge" D5 SW Verify that the calibration modes accurately report pixel and overclock values (raw mode) and their sta tistics (histogram mode) from test images (from CD- R via loader).
3.2.2.3.19 , Table 20
3.2.2.3.20 , Table 18
47 CEI 3.1.3.2 e)-2-ii "transfer efficiency, CCD Dark current, spectral resolution," T7 SW Analyze test images using the "image loader" & CD- R files. Verify that the resulting data packets are ade quate for science calibration, e.g. that the measured bias values and width of particular spectral lines is the same as that derived from the same data frames by the ACIS calibration team.
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
48 CEI 3.1.3.2 e)-2-iii "energy-to-pulse height gain, CCD quantum effi ciency, background event rate" T7 SW Analyze test images using the "image loader" & CD- R files. Verify that the resulting data packets are ade quate for science calibration, e.g. that the energy, QE, event rate, etc., of particular spectral lines is the same as that derived from the same data frames by the ACIS calibration team.
3.2.2.3.1 , Table 11
3.2.2.3.22 , Table 22
49 CEI 3.1.3.2 e)-3 Mode shall be capable of full frame transmission D5 SW Conduct tests of raw mode timed-exposure and con tinuously clocked telemetry. Verify that all pixels are being reported.
3.2.2.3.1 , Table 11
3.2.2.3.19 , Table 20
3.2.3.3.1 , Table 26
3.2.3.3.17 , Table 30
50 CEI 3.3.10 Software will be compatible to AXAF-I IAW Science Instrument ICD S1 - See below. N/A

CEI 3.7.5 Flight Software Subsystem




CEI 3.7.5.1 General



51 CEI 3.7.5.1-1-i "SW will conform to CQ-5330.1, MM-8075.1 and NMI-2410.6" R8 QA This is ensured by following the directives in the ACIS Software Quality Assurance Plan.
1.2
52 CEI 3.7.5.1-1-ii Implement SI control and redundancy manage ment D5 QA This is not subject to verification by flight software, which is unaware of redundancy state. It will be tested by ACIS EGSE during hardware integration. N/A
53 CEI 3.7.5.1-2 Provide for on-orbit changes and memory dump capability D5 SW Verify the action of the code patch and memory load/ dump commands.
3.2.8 (memory)
3.2.11 (patch)



V4 QA Verified that all memories can be examined and mod ified at their address limits.
3.2.8 (memory)
3.2.11 (patch)
54 CEI 3.7.5.1-3-i Implement CCD readout modes D5 SW/ QA Conduct tests of all science operating modes.
3.2.2 (timed)
3.2.3 (continuous)
55 CEI 3.7.5.1-3-ii Implement modes of section 3.1.3 S1 QA Ensure that tests have been performed in all imple mented science modes.
3.2.2 (timed)
3.2.3 (continuous)

CEI 3.7.5.3 Functions




CEI 3.7.5.3-a Executive



56 CEI 3.7.5.3-a(1) Interrupt Service R8 QA Review SI code to ensure that interrupts are handled. N/A
57 CEI 3.7.5.3-a(2) Power-on/initialization D5 HW This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A
58 CEI 3.7.5.3-a(3) Scheduler R8 QA Review SI code to verify the presence of a scheduler. N/A
59 CEI 3.7.5.3-a(4) Mode control N/A N/A Redundant requirement. Refer to CEI 3.1.3. N/A
60 CEI 3.7.5.3-a(5) Service routine R8 QA Verify ACIS memory examination and modification capabilities.
3.2.8
61 CEI 3.7.5.3-a(6) Utility D5 QA Verify software housekeeping commands and telem etry.
3.2.9

CEI 3.7.5.3-b Communication



62 CEI 3.7.5.3-b(1) Command Processing R8 QA Redundant requirement. Refer to TRW 3.6.1.1.1.2. N/A
63 CEI 3.7.5.3-b(2) Telemetry control processing R8 QA Redundant requirement. Refer to CEI 3.1.3. N/A

CEI 3.7.5.3-c Redundancy Management



64 CEI 3.7.5.3-c(1) Fault detection and isolation TBD QA Refer to SW FMEA 36-01104. N/A
65 CEI 3.7.5.3-c(2) Periodic Self Test D5 QA Needs to be designed. TBD
66 CEI 3.7.5.3-c(3) Hardware reconfiguration R8 QA This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A

CEI 3.7.5.4 Fault Management



67 CEI 3.7.5.4-1-i Capable to detect and isolate faults TBD QA Refer to SW FMEA 36-01104. N/A
68 CEI 3.7.5.4-1-ii Reconfigure redundant units D5 GSE This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A
69 CEI 3.7.5.4-1-iii Report status D5 SW Verify that reboot status is accurately reported in test telemetry.
3.2.9.3.5 , Table 64




QA Verify that DEA software housekeeping is accurately reported.
3.2.10.3.1 , Table 66
70 CEI 3.7.5.4-1-iv Provide sufficient data to OTS to verify instru ment operation TBD
This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A
71 CEI 3.7.5.4-1-v Provide sufficient data to ground controller in critical situations TBD
This is not subject to verification by flight software. It will be tested by ACIS EGSE during hardware integration. N/A

CEI 3.7.5.5 Periodic Self Test



72 CEI 3.7.5.5-1 Provide for self test of computational elements D5 SW Verify the action of raw frame (in timed-exposure and continuous modes) and histogram commands (timed-exposure mode only).
3.2.2.3.19
3.2.2.3.20
3.2.3.3.17

CEI 3.7.6 Data and Command Subsystem



73 CEI 3.7.6-1 AXAF-I Observatory, SI ICD, TRW, Oct 11 1994. See below. Command formats shall be compatible with AXAF-I to SI ICD S1 - See below. N/A

# Reference Requirement Description
[AXAF-I Observatory - SI ICD Sep 23 1993]
Test
Meth
Team Test Objectives References to
SRS, Rev B

TRW 3.6.1 Commands




TRW 3.6.1.1 SI Commanding



74 TRW 3.6.1.1-a-2 Stored commands for 72 hrs -- 2000 command words I3 ASC QA Memo from Paul Plucinsky, ASC, regarding ACIS stored command sizes, June 1994. Verify that the science command and parameter block lengths do not violate the assumptions used in reference . N/A

TRW 3.6.1.1.1 ACIS-OBC Ground Software




TRW 3.6.1.1.1.1 Buffer size



75 TRW 3.6.1.1.1.1-a-1 ACIS Commands stored in OBC not exceed 10K bytes I3 ASC QA Verify that the science command and parameter block lengths do not violate the assumptions used in reference [1]. N/A

TRW 3.6.1.1.1.2 Command Formats




TRW 3.6.1.1.1.2-1. ACIS commands received by OBC shall con sist of...



76 TRW 3.6.1.1.1.2-1.a Table loads in format of Table 3.6-1 + a com mand D5 EGSE This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration.
3.1.4.1 (OBC com mand interface)
77 TRW 3.6.1.1.1.2-2. Table loads shall be LT 513 bytes (TBR) D5 QA Verify that ACIS can accept table loads that contain less than 512 bytes of data.
3.1.4.1 (OBC com mand interface)
78 TRW 3.6.1.1.1.2-3. SW Command shall initiate transmission of a specific ACIS table. TBD EGSE This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration. N/A
79 TRW 3.6.1.1.1.2-4. OBC shall issue the ACIS table load as regular 16 bit commands... TBD QA Verify that ACIS SW can accept all valid com mands, and reject invalid commands, with the appropriate software housekeeping responses.
3.1.4.1 (OBC command interface)
3.2.9.3.1 (com mand echoing)
3.2.9.3.6 (ACIS software aborts)
80 TRW 3.6.1.1.1.2-4.-i ... to the RCTU address assigned to ACIS TBD EGSE This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration. N/A

TRW 3.6.1.1.1.3 ACIS operations



81 TRW 3.6.1.1.1.3.1 ACIS commanded identically in standby and normal observation modes: N/A HW This is not an ACIS requirements. N/A

TRW 3.6.1.1.1.3.2 Memory Uplink Mode:




TRW 3.6.1.1.1.3.2-a-1 During large amounts of ACIS memory trans fers...



82 TRW 3.6.1.1.1.3.2-a-1-i ACIS and OBC shall be configured to pass 512 byte packets directly to ACIS I3 QA Verify that ACIS can be loaded by 512 byte packets.
3.2.12 (uplink load command)
83 TRW 3.6.1.1.1.3.2-a-1-ii Packets can be temporarily buffered N/A - This is an OBC requirement. It is not subject to verification by ACIS flight software. N/A
84 TRW 3.6.1.1.1.3.2-a-2 Memory transfers and other OBC uplinks can be mixed TBD EGSE This is an OBC requirement. It is not subject to verification by ACIS flight software. N/A
85 TRW 3.6.1.1.1.3.2-b-1 This mode is not a special mode for OBC TBD - This is an OBC requirement. It is not subject to verification by ACIS flight software. N/A

TRW 3.6.1.2 ACIS Processor Loads



86 TRW 3.6.1.2-a-1 Observatory memory capable of loading data into ACIS. N/A - This is an OBC requirement. It is not subject to verification by ACIS flight software. N/A
87 TRW 3.6.1.2-a-2 Memory load on the order of 32K by 24 bit. D5 QA This is an OBC requirement. It is not subject to verification by ACIS flight software. N/A

TRW 3.6.2 SI Telemetry




TRW 3.6.2.1 SI Science Data



88 TRW 3.6.2.1-a-1 Data transmitted to ground via major frames IAW Fig 3.6-1 and 3.6-2 S1 QA This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration. N/A
89 TRW 3.6.2.1-a-2 Major Frame shall provide mean science + header data rate of 24 kbps D5 SW Verify that the BEP can keep up with 24Kbaud output rate.
3.1.4.4 (modes and data rates)



D5 QA Verify ACIS performance at 24 Kbaud output rate.
3.1.4.4 (modes and data rates)
90 TRW 3.6.2.1-a-3 Major frame called science data packet and does not include aspect data N/A - This is not subject to verification by flight soft ware. N/A
91 TRW 3.6.2.1-a-5 Science packets collected in serial 8 bit words by RCTU N/A HW This is not subject to verification by flight soft ware. It will be tested by ACIS EGSE during hardware integration. N/A
92 TRW 3.6.2.1-b-1 Data packets shall include 24 word (192 bits) header IAW Table 3.6-2 D5 EGSE This is not subject to verification by flight soft ware. N/A
93 TRW 3.6.2.1-b-2 Header supplied by observatory merged with data in CDM N/A - This is not subject to verification by flight soft ware. N/A
94 TRW 3.6.2.1-b-2-i Definition of Earth Centered Inertial Coordi nate system N/A - This is not subject to verification by flight soft ware. N/A
95 TRW 3.6.2.1-c-1 Telemetry modes 1 and 2 have identical formats IAW Fig 3.6-2 D5 EGSE Construct tests to verify that ACIS telemetry packets are identical in the two modes.
3.1.4.3 (telemetry formats)
96 TRW 3.6.2.1-c-2 Mode 1 ACIS data mode @ 24 kbps + 500 bps of HRC cal data D5 QA Construct tests to verify that ACIS can gener ate telemetry at 24 kbps.
3.1.4.4 (modes and data rates)
97 TRW 3.6.2.1-c-2 Mode 2 HRC data mode @ 24 kbps + 500 bps of ACIS cal data D5 QA Construct tests to verify that ACIS can gener ate calibration data at 500 bps.
3.1.4.4 (modes and data rates)

TRW 3.6.2.2 SI Engineering Data



98 TRW 3.6.2.2-1 SI provide housekeeping data in operational mode to RCTU D5 HW Hardware housekeeping is sent directly to the RCTU and is not subject to verification by flight software. Construct tests to verify the content of DEA housekeeping telemetry.
3.1.4.5 (discrete commands)
3.2.10.3 (DEA housekeeping)
99 TRW 3.6.2.2-1-i Housekeeping data rate 512 bits per every major data frames (approx. 32 secs) D5 QA Hardware housekeeping is sent directly to the RCTU and is not subject to verification by flight software. Construct tests to verify the bit rate of DEA housekeeping telemetry.
3.1.4.5 (discrete commands)
3.2.10.3 (DEA housekeeping)
100 TRW 3.6.2.3-2 ACIS put data on AXAF-I data bus via RCTU N/A HW/ SW This is not subject to verification by flight soft ware. N/A

TRW 3.6.2.3 SI Calibration Data



101 TRW 3.6.2.3-1 SI provide calibration data =.5 kbps of insert field of major data frame D5 SW Verify that raw histogramming mode is intended to work at 500 bps.
3.1.4.3 (telemetry formats)



D5 QA Conduct a test of raw histogramming mode at 500 bps.
3.1.4.4 (modes and data rates)
102 TRW 3.6.2.3-1-ii Calibration data taken not at telescope focus D5 SW Conduct a test of raw histogramming mode at 500 bps. Verify that full histograms can be read out at that speed.
3.1.4.4 (modes and data rates)
103 TRW 3.6.2.3-2 Data shall include 2 word header/major data frame I3 QA Verify inclusion of latched microsecond clock in first 32 bits of ACIS data within each sci ence frame.
3.1.4.6 (ACIS timestamps)

TRW 3.6.2.4 Telemetry Synchronization



104 TRW 3.6.2.4-1 CCDM shall provide prime and redundant major frame pulses to FPSIs N/A HW This is not subject to verification by flight soft ware. N/A
105 TRW 3.6.2.4-1-i Major frame pulses appear at the beginning of telemetry major frame N/A
This is not subject to verification by flight soft ware. N/A

TRW 3.6.2.5 Telemetry Mode Change



106 TRW 3.6.2.5-a CCDM command via serial command channel to indicate telemetry mode change D5 QA Verify that ACIS will accept serial CCDM commands.
3.1.4.4 (modes and data rates)
107 TRW 3.6.2.5-b Mode change occurs at issuance of next major frame sync signal. I3 QA Verify that ACIS will not drop telemetry dur ing a mode change.
3.1.4.4 (modes and data rates)

TRW 3.6.3 Central Timing



108 TRW 3.6.3-a-1 AXAF-I central clock relatable to UTC within 100 microsecs N/A - This requirement does not concern ACIS flight software. N/A
109 TRW 3.6.3-a-2 AXAF-I clock resolution of 1 microsec N/A - This requirement does not concern ACIS flight software. N/A
110 TRW 3.6.3-c-1 CCDM provide prime and redundant 1.024 MHz clocks to FPSs N/A HW This requirement does not concern ACIS flight software. N/A
111 TRW 3.6.3-c-1-i "1.024 MHz clocks to be used by 'Microsecond Counter'in the SIs" N/A HW This requirement does not concern ACIS flight software. N/A
112 TRW 3.6.3-c-2 X-Ray event time tag with count from Micro second Counter R8 QA Verify that the correct microsecond time tags are included in timed and continuous exposure telemetry packets. Table 21 (timed exposures) Table 33 (continu ous clocking)
113 TRW 3.6.3-c-2-i Time tag indicates elapsed time from beginning of major frame pulse D5 SW Verify that the correct microsecond time tags are included in timed and continuous exposure telemetry packets.
3.1.4.6 (ACIS timestamps)
114 TRW 3.6.3-c-3 Resolution of Microsecond Counter specified in ACIS CEI Specification. R8 QA see CEI 3.1.3.2 a)-d-i and ii. N/A
115 TRW 3.6.3-d-1 CCDM provide redundant science header pulses at begin of every Major frame N/A - This requirement does not concern ACIS flight software. N/A
116 TRW 3.6.3-d-1-i and every 2.05 seconds thereafter. N/A - This requirement does not concern ACIS flight software. N/A