Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 29 of 79
Astrium Ltd owns the copyright of this document which is supplied in confidence and which shall not be used for any purpose other than that for which it is supplied and shall not in
whole or in part be reproduced, copied, or communicated to any person without written permission from the owner.
GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6.3.2 EIU SpaceWire SHP Interfaces
One special case of SpaceWire BUS simulation is that of the EIU for Standard High Power (SHP) Pulse
Commands.
When simulation of the EIU is required, the Avionics SCOE simulates SHP generation in hardware (see
Section 3.6.9 - SHP Pulse Command Generation) to allow switching of Spacecraft Units.
AVI-2757/CREATED/T
In all test modes, the local Application Software shall decode the EIU SpaceWire BUS commands and
generate the SHP Pulses in hardware for SHP BUS commands.
Those CDMU-EIU SpaceWire commands related to SHP generation will be identified by Astrium Ltd in the
SpaceWire responder input file to be provided, as defined in AVI-4099.
3.6.3.3 SpaceWire Active Interface
To allow the Avionics SCOE to SPY the SpaceWire BUS interfaces when the real CDMU and EIU are
connected, an active interface is needed to allow the Avionics SCOE to monitor the SpaceWire traffic
without disturbing normal BUS operation.
AVI-4112/CREATED/
An Active Interface Box shall be provided for each SpaceWire BUS to allow monitoring of the BUS
when the CDMU and EIU units are connected.
Each Active Interface Box is connected between the Gaia CDMU and the EIU, as shown in Figure 3.6-1.
SpaceWire
Active Interface EIUCDMU
Avionics
SCOE
SpaceWire
Interface
Test Harness
(Astrium Supplied)
Spacecraft
Harness
SCOE Cable
(Supplied with SCOE)
Interface Box
(Supplied with SCOE)
Figure 3.6-1: SpaceWire Active Interface Box
AVI-4124/CREATED/
The design of the Active Interface Box shall be such that SPY of both the prime and redundant side of
each SpaceWire BUS is possible in parallel.
AVI-4125/CREATED/
The design of the Active Interface Box shall be such that the SpaceWire interface requirements, as
defined in [AD05] Section 3.5.5.1 shall be maintained.
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern