SOIS architecture to handle RIUs F. Torelli (ESA) & G. Rakow (NASA) 15/04/2013

Outline Remote Interface Unit (RIU) definition Tunnelling RIU and SOIS Smart RIU and SOIS RIUs and SOIS EDS Summary The presentation summarises the tech note “Aggregated devices in SOIS and SOIS EDS” distributed to the SOIS WG mailing list on 28/11/2012

Remote Interface Unit (RIU) definition

Remote Interface Unit 1/2 Also known as Remote Terminal Unit Connects devices to the Processor Module (PM) where flight SW (FSW) runs Data concentrator Physical aggregation Interfaces to very simple sensors/actuators Interfaces to smart devices Handles point-to-point links Handles sensor buses Sensor bus DEVA Point-to-point link DEV1 DEVB DEV2 DEVC Processor Module FSW RIU I/F Logic System bus/subnetwork

Remote Interface Unit 2/2 Tunnelling RIU: PM manages each device separately PM is aware of the access protocol and data formats of each device RIU is just a multiplexer/demultiplexer Smart RIU: RIU autonomously access the devices RIU is aware of access protocol and data formats of each device PM is only aware of the access protocol and data formats of the RIU DEVA DEVA DEV1 DEVB DEV1 DEVB DEV2 DEVC DEV2 DEVC RIU complexity RIU Cmd & Acq Logic RIU Mux/Demux

Tunnelling RIU and SOIS

Tunnelling RIU in SOIS 1/2 Device access protocol is managed at DAS level in the PM The “simple” RIU Mux/Demux protocol is managed at DAS level in the PM System bus communication between PM and RIU is managed at subnetwork level

Tunnelling RIU in SOIS 2/2 Possible mux/demux mechanisms: Commands/data encapsulation via Packet Service Time separated commands via Packet or Memory Access Service Packet exchanged at the subnetwork service interface Cmd/Data consumed/produced by Dev X RIU Channel X Selector Dev X Header Dev X Command/Data Packet exchanged betwen RIU and Dev X RIU Channel X Selection Dev X Command/Data RIU Channel Y Selection Dev Y Command/Data Command to RIU Cmd/Data to/from Dev X Command to RIU Cmd/Data to/from Dev Y

Smart RIU and SOIS

Smart RIU in SOIS 1/2 Device access protocol is managed at RIU level Device data are accessed via RIU DAS using specific Value Ids RIU access protocol is managed at DAS level in the PM System bus communication between PM and RIU is managed at subnetwork level

Smart RIU in SOIS 2/2 Possible RIU/device access mechanisms: Devices Cmd/Data mixed inside RIU Cmd/Data (Packet Service) Devices Cmd/Data allocated in RIU memory space (Memory Access Service) Packet passed to the subnetwork service RIU Header Dev X Cmd/Data 1 Dev Y Cmd/Data 1 Dev X Cmd/Data 2 Dev X Cmd/Data for Value Id X1 Dev Y Cmd/Data for Value Id Y1 Dev X Cmd/Data for Value Id X2 Dev X Cmd/Data 1 at 0x10 Value Id X1  MAS rd/wr.req to RIU at addr 0x10 Dev X Cmd/Data 2 at 0x20 Value Id X2  MAS rd/wr.req to RIU at addr 0x20 Dev Y Cmd/Data 1 at 0x28 Value Id Y1  MAS rd/wr.req to RIU at addr 0x28 Dev X Cmd/Data 3 at 0x30 Value Id X3  MAS rd/wr.req to RIU at addr 0x30 Dev Z Cmd/Data 1 at 0x34 Value Id Z1  MAS rd/wr.req to RIU at addr 0x34 Dev Z Cmd/Data 2 at 0x3C Value Id Z2  MAS read.req to RIU at addr 0x3C

RIUs and SOIS EDS

Tunnelling RIU and SOIS EDS RIU + Devices can be described by separate EDS The DAS of each Device is built from RIU and device specific EDS Adding a new device to the RIU implies introducing the new Device EDS and a new DAS instance and updating the Device Layout in the RIU EDS Dev1 EDS Service I/F Dev1 Access Prot. Dev2 EDS Service I/F Dev2 Access Prot. RIU EDS Service I/F Mux/Demux Prot. Devices Layout

Smart RIU and SOIS EDS One EDS describes RIU + Devices as a single equipment The DAS of the RIU is built from RIU EDS only Adding a new device to the RIU implies updating the RIU EDS and regenerating the MIB of the RIU DAS to access the new valid Value Ids RIU EDS Service I/F RIU Access Prot. Devices Layout RIU EDS is built using devices EDS as input (for data formats) Credit for the onion diagram: S. Fowell

Summary

Summary Tunnelling RIU Smart RIU 1 DAS for every device Each Access Protocol composed by device + RIU access protocol 1 EDS for each device 1 EDS for the RIU RIU as equipment is described by the collection of the device and RIU EDS Smart RIU 1 DAS for the RIU as equipment RIU Access Protocol in charge to extract the device specific data from the RIU data 1 EDS for the RIU as equipment EDS is built with inputs from device EDS