Specification • The rear transition module (RTM) of the VPX standard is a plug-in module at the back of the circuit card chassis that is in line with the front plug-in module or node. The backplane connectors on the RTM are the same as those used on the plug-in nodes. Also, as...
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Receive TEP Operations
Specification • A receive TEP shall not send DATA or CONTROL packets. It may only send ACK packets. Sliding Window The receive TEP shall maintain a sliding window, which is a range of consecutive sequence numbers that is used to determine whether each received DATA packet will be accepted or discarded. The...
Reconfigurable Processing Profile
Other • The Reconfigurable Processing (RP) profile defines a high-performance processing solution suitable for constructing nodes for mission data processing, sensor interfaces, and other applications requiring high-bandwidth processing and communications. Nodes based on the RP profile work alongside other nodes within the JAS architecture. The SMAC Profile and the Communication Profile implement...
Reconfigurable Processing Profile
Profile • The RP profile defines a high-performance processing solution suitable for constructing nodes for mission data processing, sensor interfaces, and other applications requiring high-bandwidth processing and communications. The RP profile works alongside the CH Profile and PS Profile to implement nodes within the JAS architecture. The SMAC Profile and the Communication...
Reliable Delivery
Specification • JRDDP detects lost packets, duplicate packets, out of sequence packets, and provides damaged data recovery. The protocol provides additional error detection beyond the SpaceWire physical layer by utilizing Cyclic Redundancy Checks (CRCs), packet sequence numbers, positive acknowledgement, and timeouts to detect lost or duplicated Data packets.
Remote Memory Access Protocol
Profile • RMAP is used to access memory devices across a SpaceWire data link. RMAP can be used to support many functions within a JAS-based system, such as: Configure SpaceWire routers Load and control FPGA applications Configure and control sensors Gather state of health information Initializing and retrieving the contents of memory...
Remote Memory Access Protocol
Specification • JAS should use the RMAP standard to remotely access memory devices across the SpaceWire network.
Retransmission
Specification • If an ACK packet is not received by the transmit TEP within a defined channel-specific timeout interval the DATA packet shall be retransmitted.
Routing
Profile • SpaceWire uses wormhole routing to route packets through the network. Each packet contains a header which holds the destination node address either as the route through the network or as the identity of the destination node. As soon as the header for a packet is received the switch determines the...
RP_Applications
Profile • Common instantiations of the RP profile include, but are not limited to: Sensor interface Mission data processing High-Speed Data switch Volatile Memory Storage Softcore processing
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