Profile • The primary role of the CH node in this application is to connect payloads to the host vehicle and to serve as the system controller for payload operations. These functions are implemented through software services running on the radiation-hardened microprocessor. Host Vehicle Interface and Configuration Manager Instantiation A radiation-hardened FPGA...
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Interconnect Technologies
Profile • This profile describes the interconnect technologies supported by JAS. Each interconnect will be comprised of three layers based on the RapidIO standard: the Logical Layer; the Transport Layer; and the Physical Layer. The figure below shows a mapping of the interconnect layers to the OSI layers. The Application Layer is...
JAS CCSDS SOIS
Profile • The JAS communication architecture is based on the Consultative Committee for Space Data Systems (CCSDS) Spacecraft Onboard Interface Services (SOIS) reference communication architecture. SOIS describes a layered architecture that allows applications to be abstracted from the specific communication data links. The SOIS architecture describes four layers: the Application Layer, the...
JAS Efficient Exchange Protocol
Profile • The JAS Efficient Exchange Protocol (JEEP) is a best-effort packet transmission protocol that can be used to send messages between applications over a SpaceWire data link. JEEP is similar to the JRDDP protocol in that provides a segmentation capability to promote fairness between all applications needing to communicate on the...
JAS Packet Protocol
Profile • The JAS Packet Protocol (JPP) provides the capability to send a single JAS Packet over a SpaceWire data link. JPP is just an encapsulation of a JAS Packet within a SpaceWire packet. Even though it is classified as a SpaceWire protocol, there are no QoS functions provided apart from those...
JAS Reliable Data Delivery Protocol
Profile • The JAS Reliable Data Delivery Protocol (JRDDP) is a reliable packet transmission protocol that can be used to send messages between applications over a SpaceWire data link. It is based on a protocol created by the National Aeronautics and Space Administration (NASA) at the Goddard Spaceflight Center in Greenbelt, Maryland,...
Local POL Power Conversion
Profile • PS Node Local POL Conversion The output power from the PS node is one or more secondary voltage rails that are distributed throughout the system. This distributed secondary voltage is typically a higher voltage than those required by the components on the other nodes in order to improve efficiency by...
Local Power Conversion and Control
Profile • SMAC Local Power Conversion and Control The input power for the SMAC is provided by a single voltage rail that is distributed throughout the system and delivered to nodes. The power for the SMAC shall default to an “on” state for at least one node in the system when the...
Mechanical
Profile • The recommended CH implementation is on a 6U VPX board, as defined in the VITA 46 standard and the Mechanical Specification. VPX is preferred for a number of reasons, a few of which include: 3U and 6U board formats to accommodate varying sizes High-density connectors and flexible pinout Availability of...
Mechanical
Profile • Exact mechanical specifications will vary widely depending on the type of module and the location where it will be integrated into the system. However, there are two predominant applications for the expansion module: a mezzanine board for CH or RP profiles or a RTM to attach to a backplane. Mezzanine...
Mechanical
Profile • The recommended PS implementation is on a 6U VPX board, as defined in the VITA 46 standard and the Mechanical Specification. VPX is preferred for a number of reasons, a few of which include: 3U and 6U board formats to accommodate varying sizes High-density connectors and flexible pinout Availability of...
Mechanical
Profile • The recommended RP implementation is on a 6U VPX board, as defined in the VITA 46 standard and the Mechanical Specification. VPX is preferred for a number of reasons, a few of which include: 3U and 6U board formats to accommodate varying sizes High-density connectors and flexible pinout Availability of...
Megabit Interfaces
Profile • There are several megabit interfaces that may be utilized on the CH node. Some examples of these include: SpaceWire RS-422, RS-232 MIL-STD-1553 CAN bus SpaceWire is the preferred solution for systems requiring data rates below 200 Mbps. SpaceWire links can scale from 2 to 200 Mbps at full duplex and...
Megabit Interfaces
Profile • There are several megabit interfaces that may be utilized on the RP node. Some examples of these include: SpaceWire RS-422, RS-232 MIL-STD-1553 CAN bus SpaceWire is the preferred solution for systems requiring data rates below 200 Mbps. SpaceWire links can scale from 2 to 200 Mbps at full duplex and...
Megabit Interfaces
Profile • There are several megabit interfaces that may be utilized on the RP node. Some examples of these include: SpaceWire RS-422, RS-232 MIL-STD-1553 CAN bus SpaceWire is the preferred solution for systems requiring data rates below 200 Mbps. SpaceWire links can scale from 2 to 200 Mbps at full duplex and...
Megabit-class Interfaces
Profile • There are several megabit-class interfaces that may be utilized on the PS node. Some examples of these include: SpaceWire RS-422, RS-232 MIL-STD-1553 CAN bus SpaceWire is the preferred solution for systems requiring data rates below 200 Mbps. SpaceWire links can scale from 2 to 200 Mbps and are well suited...
Memory Access Service
Profile • The Memory Access Service is used to asynchronously read and write to memory-based devices across a network. The Memory Access Service is based on the CCSDS SOIS Memory Access Service and provides a layer of abstraction between applications and memory-based devices. It provides a common API for applications to use...
Memory Storage
Profile • Another possible instantiation of this profile is to include non-volatile memory and/or SRAM/SDRAM storage on a CH or RP node. Memory Storage Instantiation
Memory Technologies
Profile • There are two types of memory technologies that are highly recommended for inclusion on the CH node: non-volatile flash or EEPROM, and higher-speed SRAM or SDRAM memory. Non-volatile memory is necessary to store the software that the microprocessor will execute upon power-up. Non-volatile memory may also be necessary to store...
Memory Technologies
Profile • RP Node Memory Technologies External memory is often included on RP node instantiations to support the FPGA’s processing. Among other uses, memory provides storage for sensor data and working space to implement processing algorithms. Any combination of memory technologies, including Synchronous Dynamic Random Access Memory (SDRAM), Static Random Access Memory...
Microprocessor
Profile • The CH Node is a microprocessor-based node that executes software stored in supplemental on-board memory. It is highly recommended that this microprocessor be radiation-hardened for reliability. The processor is typically attached to a non-volatile memory technology and a faster SRAM or SDRAM memory. A bus interface between the microprocessor and...
Mission Data Processing
Profile • This application employs the CH node as a mission data processor, utilizing the radiation-hardened microprocessor and on-board memories to perform computations in support of the payload’s mission. Additional optional memories or other board capabilities may be built onto the expansion port if desired. Mission Data Processing Instantiation This application is...
Multicast/Broadcast
Profile • SpaceWire doesn’t inherently support a multicast or broadcast capability. There is a time-code distribution function but it is limited in the amount of user information that can be distributed. An approach has been developed for a broadcast capability through custom router and endpoint modifications. It uses a set of dedicated...
Network Discovery
Profile • When probing for routing switches, early network discovery techniques typically relied on each routing switch’s configuration port to respond to identification requests to confirm the routing switch’s presence. A request packet was typically dispatched to the configuration port, and a response packet provided confirmation of existence. This same request/response approach...
Network Interfaces
Profile • All JAS nodes communicate through a standard set of interfaces that adhere to standard protocols. Refer to the Electrical Specification for physical layer technical information and Communication Specification for details on standard data protocols. This section describes two classes of network interfaces, megabit interfaces with line speeds below one gigabit...
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