Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 30 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6.4 PacketWire BUS Interfaces
AVI-3476/CDMU-3941/T
Interfaces shall be provided for the Spacecraft CDMU/PDHU (4) PacketWire (PW) BUS.
AVI-3477/GSE-SYS-397/T
Each Interface shall provide the following services:
Redundant Bus Operation (A/B)
Bus Monitor Functions (Bus Spy)
AVI-3483/CDMU-3943/T
The PW Interface signalling rate shall operate to a maximum of 10 Mbps.
AVI-3530/CDMU-3449/T
The PW Interface shall withstand a data throughput from the PLM of 2000 packets/second with a
packet size varying from 300 bytes to 32 Kbytes.
AVI-3531/CDMU-3947/T,R
The PW Interface shall be implemented in accordance with the requirements of AD08.
AVI-3485/CREATED/T
The PW BUS Interface cards shall be configured and controlled by the Avionics SCOE, or by direct
interface to the RTS for closed-loop Avionics testing.
AVI-3486/CREATED/R
The PW BUS Interface cards shall be based on COTS or previously developed in-house systems
(where possible).
AVI-3488/CREATED/T
The Avionics SCOE shall provide decommutation of the PW BUS data for parameter acquisition of
each BUS.
AVI-3489/CREATED/T
For each PW BUS, Prime and Redundant BUS operation shall be possible in parallel.
AVI-3490/CREATED/T
The Avionics SCOE shall provide data simulation for each PW BUS.
AVI-3491/CREATED/T
It shall be possible to configure PW BUS operation from the local MMI, by definition from the CCS
(Test Procedure/Command Line) or from the RTS.
AVI-3492/CREATED/T
The following configuration options shall be available for each PW BUS:
Command: Comment
INITIALISE Reset, Disabled, Spy OFF
DISABLE Disabled, Spy OFF
ENABLE Enabled, Spy OFF
ENABLE SPY Spy ON (BUS may be disabled)
DISABLE SPY Spy OFF
ENABLE PASSIVE
3
Enabled, but does not respond on the BUS
DISABLE PASSIVE
3
Disabled
SET ERROR n Set specified ERROR on SpaceWire BUS
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