PACS IBDR 27/28 Feb 2002 SPU High Level Software1 H. Bischof, A.N. Belbachir (TUVIE) F. Kerschbaum, R. Ottensamer, P. Reegen, C. Reimers (UVIE)

PACS IBDR 27/28 Feb 2002 SPU High Level Software2 Data Compression/Reduction Scheme Figure 1. Data Compression/Reduction Scheme ~120Kbits/s 1800 Kbits/s

PACS IBDR 27/28 Feb 2002 SPU High Level Software3 ASW Requirements - SPU HLSW Data Flow Spectroscopy (400 detectors, 50 test channels, 18 empty channels per SPU Module): –2000 kbits/s (4000 kbits/s for both SPUs) Photometry (512 detectors per sub-image): –5 sub-images (1700 kbits/s for both SPUs) –340 kbits for the LWL SPU –1360 kbits/s for the SWL SPU Telemetry rate –~120 kbits/s are available for science data –Transparent mode: max. of 28 selected detectors in Spectroscopy or max. of 185 selected detectors in Photometry –Default mode: Spectroscopy 97,14 kbits/s Photometry 105,3 kbits/s

PACS IBDR 27/28 Feb 2002 SPU High Level Software4 ASW Requirements - Telemetry rates Figure 2. Telemetry rates for the SWL and LWL SPU

PACS IBDR 27/28 Feb 2002 SPU High Level Software5 ASW Requirements - Default Mode in Spectroscopy Figure 3. Default Compression Mode in Spectroscopy CR RF = 8 CR INT = 4 CR TSR = 1,6 CR = 51,2

PACS IBDR 27/28 Feb 2002 SPU High Level Software6 Data Compression/Reduction - Spectroscopy Ramp Fitting Methods (1) Least Squares RANSAC RANSAC+Least Squares 2-Samples Fit

PACS IBDR 27/28 Feb 2002 SPU High Level Software7 Data Compression/Reduction - Spectroscopy Ramp Fitting Methods (2) SDE_ovl_app3 SDE_reg_app3 SDE_ovl_app2SDE_reg_app2 SDE_ovl_app1 SDE_reg_app1

PACS IBDR 27/28 Feb 2002 SPU High Level Software8 Data Compression/Reduction - Spectroscopy Evaluation of ramp fitting algorithms and test results

PACS IBDR 27/28 Feb 2002 SPU High Level Software9 Data Compression/Reduction - Spectroscopy Ramp 1 Ramp 2 Ramp 3

PACS IBDR 27/28 Feb 2002 SPU High Level Software10 Data Compression/Reduction - Spectroscopy Analysis with simulated and real test data Status –Preprocessing, glitch detection –Ramp Fitting: cumulative errors  difference scheme: RANSAC (2 point with least square errors) implemented –Integration: mean algorithm implemented –TRR & SRR: Reference value & Difference values

PACS IBDR 27/28 Feb 2002 SPU High Level Software11 ASW Requirements - Default Mode in Photometry Figure 4. Default Compression Mode in Photometry CR RF = 4 CR Int = 1 CR TSR = 3,9 CR = 15,6

PACS IBDR 27/28 Feb 2002 SPU High Level Software12 Data Compression/Reduction - Photometry Evaluation of averaging algorithms and test results

PACS IBDR 27/28 Feb 2002 SPU High Level Software13 Data Compression/Reduction - Photometry Error [%]Plateau 1Plateau 2Plateau 3 Mean0,22,516,7 Median0,00,30,0 Sample Difference0,1 Plateau 1 Plateau 2 Plateau 3 Time Mean Median Sample Difference Real readout Voltage

PACS IBDR 27/28 Feb 2002 SPU High Level Software14 Data Compression/Reduction - Photometry Analysis with simulated data from our data generator Status –Preprocessing, glitch detection –Robust Averaging: mean algorithm implemented (calibration on ground) –Integration: mean algorithm implemented –TRR & SRR: Reference value & Difference values

PACS IBDR 27/28 Feb 2002 SPU High Level Software15 SPU HLSW Context Diagram Figure 5. SPU HLSW Context Diagram

PACS IBDR 27/28 Feb 2002 SPU High Level Software16 SPU HLSW Concept Figure 6. SPU HLSW Concept HLSW consists of three main parts: Communication Interfaces to DPU and to DEC/MEC Watch Process (Command Acknowledgement) Application Software (Reduction/ Compression)

PACS IBDR 27/28 Feb 2002 SPU High Level Software17 SPU SW Interfaces DPU TO SPU SW Interface –Communication is bi-directional (commands, response, HK and compressed data) –All SPU SW activities are commanded by DPU (e.g. start, stop, …) –SPU SW acknowledges the reception of all DPU commands according to the communication protocol –SPU SW sends telemetry packets to DPU –DPU checks the “life” of the SPU SW via the HK DEC/MEC to SPU SW Interface –Communication is unidirectional (DEC/MEC to SPU) –Packet from DEC/MEC to SPU consists of science data and a header –Science data are detector readouts and test channels –Header contains the instrument configuration and the compression parameters

PACS IBDR 27/28 Feb 2002 SPU High Level Software18 Memory Description Figure 7. Memory Distribution for the SPU HLSW 1.5MB EEPROM 32KB DPRAM 7MB RAM –1 Mbytes for program storage –0.25 Mbytes for SW tables storage –1 Mbytes for input science data buffering –0.25 Mbytes for the DEC/MEC header buffering –0.5 Mbytes for output data buffering –4 Mbytes are for processing, etc. EEPROM (1,5 MB) DRAM (4 MB) Processing Buffer (2.5 MB) Input Buffers (1.25 MB) Science Data Buffer (1 MB) Header Buffer (256 kB) Reserved (256 kB) PRAM (3 MB) Program Buffer (1MB) Output Buffer (560 kB) Table Buffers (256 kB) DPRAM (32 kB) (SMCS)

PACS IBDR 27/28 Feb 2002 SPU High Level Software19 SPU HLSW Status SPU HLSW design frozen SPU HLSW Interfaces with DPU and DEC/MEC: –Interface Control Document are under configuration control –Software interfaces have been verified under test environment (PC+emulator) –Detailed description of LLSW drivers are available since 2001, 13 Dec. for the integration on the real HW Application Software: –Mechanism has been verified under test environment (PC+emulator) –Performance not tested (individual compression modules tested ‘Prelimi.’) No real data No representative development HW

PACS IBDR 27/28 Feb 2002 SPU High Level Software20 PA/QA Activities and Schedule PACS PA Plan is adopted (from IFSI) SPU Test Plan is under configuration control –SPU HLSW Interface tested under test environment (PC+ Emulator+ Spacewire Board) –SPU HLSW individual module complexity tested in Sigma board Schedule –SPU SW Interfaces and application SW mechanism have been tested –SPU HLSW functionality will be tested at IAC (Spain) –Test at IAC is planned in March/April 2002 –Delivery of SPU HLSW to project by begin May

PACS IBDR 27/28 Feb 2002 SPU High Level Software21 Summary and Perspective SPU HLSW Interfaces tested with OBS Simulator Preliminary Application SW modules are ready for integration and performance tests in real HW Several ramp fitting and averaging algorithms are tested –It is still possible to add new algorithms to this library –New algorithms will be tested (functionality and performance) Verification of SPU HLSW functionality will be done at IAC (Spain) in March/April 2002