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CDS-EPD Interface Description


Table 10. EPD Telemetry Mode Definition Block Descriptions

Address Range, hex # of Bytes Description
   Record Mode
1800-1826 39S/W Patch Hooks
1827-1865 63Accum. Service Table
1866 1TLM Mode (=1)
1800-1866 103Total
   Real-Time Mode Map 1
1800-1826 39S/W Patch Hooks
1827-1857 49Accum. Service Table (Map1)
1858 1MapID (=0)
1859-1865 13Filler (zeroes)
1866 1TLM Mode (=2)
1800-1866 103Total
   Real-Time Mode Map 2
1800-1826 39S/W Patch Hooks
1827-1857 49Accum. Service Table (Map2)
1858 1MapID (=1)
1859-1865 13Filler (zeroes)
1866 1TLM Mode (=2)
1800-1866 103Total

Table 11. Bus Transactions for Version3 Software Implementation

Item Description Transfer Period RTI  Source
Address		 Destin. Address Size (bytes)
AACS Spin Rotor Vector once every minor frame 8CDS EPD-2000H6
First RT TLM Packet (header, 42 accumulator values)once every minor frame 3 EPD-2006H CDS127
Second RT TLM Packet (6 accumulator values, HV monitor value (1 byte),  Science Record Array (5  bytes Hskpg/Status + 60 bytes CMS PHA (30 are filler in Map1) once every minor frame3 EPD-2085H CDS84 (only 54 bytes used in Map1
New Science Record Flag beginning every science record** 6*CDS EPD-1867H1
Telemetry Mode Definition Block (includes S/W patch hooks, Accumulator Service Table, MapID, and TLM_Mode_ID every mode change)  6*CDS EPD-1800H39

Notes: * RTI has not been finalized yet. The EPD GSE has been using RTI 6 for testing purposes. The RTI must be either 0, 2, 4, or 6.
** The new science flag in the EPD memory is set by the CDS and cleared by the EPD processor after it is read.

Next: CDS-Produced EPD Telemetry Record

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Updated 11/2/04, T. Hunt-Ward
tizby@ftecs.com