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Solar Probe Plus FIELDS DFB Peter Harvey Barbara Plante Oct 25, 2013

Solar Probe Plus FIELDS DFB Peter Harvey Barbara Plante Oct 25, 2013. DFB FSW Requirements. Initialization. FSW Initialization of DFB DCB configures the DFB after it is powered up/reset/fails checksum. (No non-volatile storage on DFB). Stored on DCB for DFB EEPROM

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Solar Probe Plus FIELDS DFB Peter Harvey Barbara Plante Oct 25, 2013

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  1. Solar Probe Plus FIELDS DFB Peter Harvey Barbara Plante Oct 25, 2013

  2. DFBFSW Requirements

  3. Initialization FSW Initialization of DFB DCB configures the DFB after it is powered up/reset/fails checksum. (No non-volatile storage on DFB). Stored on DCB for DFB EEPROM - Configuration register values - DFB Mode tables - Sidecar ASIC Firmware 2. RAM - DFB Telemetry Buffers DFB entries in DCB EEPROM DFB entries in DCB SRAM

  4. Initialization • After power-on, wait at least 500ms to allow the DFB power on reset signal to expire. • Issue Reset Message. • Configure FPGA registers using Block Write Messages. • Only registers that require a value other than their reset (default) value need to be programmed. • Write the SIDECAR ASIC Firmware to the DFB using block write messages. • Configure DFB Mode tables using one or more block Write messages. • Issue an DFB Model Message to start operations.

  5. Processing Processing • Send sample clock and spacecraft clock once per second to update DFB time registers. • Reset the DFB when commanded from ground or DCB fault management. • Start the DFB sequencer after a reset command is issued or to change the current orbital mode of the DFB sequencer. • No DFB mode commands less than 400ms before the next F0 command (1PPC).   • DFB mode commands should occur near the beginning of the 0.87s cycle.  • Read Data from the DFB based on selected address • Block data writes to A and B channels. • Telemetry Collection

  6. Data Products • Waveform Packets Lossless data compression • High Speed Burst Memory Packets may be enabled (per ICD) • Housekeeping Packet • Spectra Data Packet - generated in Active and Passive sub-modes. Compression is not supported on this packet since the values are already compressed using the pseudo-log value compression. • Read Response Packet • DFB puts into “leaky buckets” – Survey, Archive 1, Archive 2, Archive 3 • DCB FSW decides survey buffer (real time) or Flash (stored data) based on APID of incoming packet from DFB.

  7. Issues Issues TBD • TBD

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