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Profile • SpaceWire supports three types of addressing: Path (Physical) Addressing, Logical Addressing, and Regional Addressing. JAS uses regional addressing because it provides the greatest flexibility to create scalable networks. Regional addressing uses a two-byte scheme where the first byte identifies the router and the second byte identifies the endpoint address connected...
Analog Electronics
Profile • This instantiation of the Expansion Profile implements a 6U VPX board to include analog electronics and connectors to access incoming signals from external sensor modules. The analog electronics are connected to an RP node through the system backplane. The FPGA on the RP node filters and processes the incoming data...
Analog to Digital Converter and Multiplexer
Profile • SMAC ADC and Analog MUX The SMAC shall include an ADC to take analog measurements of board parameters (voltage, current, temperature). These values are returned to the system controller as SOH information. An analog MUX may be required so that multiple analog values can be read by the ADC. The...
Applications
Profile • Common instantiations of the CH profile include, but are not limited to: Host Vehicle Interface and Configuration Manager Mission Data Processing Non-Volatile Memory Storage Mass Memory Node The CH node can operate in several capacities, the most essential of which is the Host Vehicle Interface and Configuration Manager. However, several...
Applications
Profile • Instantiations of the Expansion Profile can improve the versatility of other node profiles by adding additional capability, connectivity, or capacity. Common instantiations of the Expansion Profile include, but are not limited to: Host vehicle interface Memory storage Rear transition module Analog electronics
Applications
Profile • Instantiations of this profile are intended to function as primary-to-secondary power converters, producing the secondary voltage rail(s) that are distributed to other nodes. The ‘Local POL Power Conversion’ section mentions one “or more secondary voltage rails” being produced by the PS node. One voltage rail (typically +5 or +12 V)...
Command and Host Processor Profile
Profile • The Command and Host Processor (CH) profile defines a microprocessor-based solution suitable to construct nodes for mission data processing, spacecraft interfaces, and other applications requiring software execution on microprocessor platforms. The CH profile works alongside the RP Profile and PS Profile to implement nodes within the JAS architecture. The SMAC...
Communication Profile
Profile • The Communication Profile defines standard interfaces for facilitating communication between RP, CH, and PS nodes within a JAS system. The Communication Profile focuses primarily on communication between payload applications. It leverages industry standards to support network-based communication using serial interfaces. A common set of communication protocols for space applications has...
Companion Field Programmable Gate Array
Profile • A separate radiation-hardened companion FPGA is present on the CH node to implement timing functions, custom peripherals, and bridge to proprietary interfaces that may not be directly supported by the microprocessor. The FPGA typically attaches to the microprocessor through industry-standard bus interfaces, though the exact connection method will vary based...
Discrete Signaling
Profile • SMAC Discrete I/O and Data Bus Signaling The SMAC has capabilities to read and drive both discrete I/O values and data buses. The FPGA I/O dedicated for this purpose can be either configured as dedicated inputs and outputs or can be bi-directional with input or output behavior configured through the...
Expansion Profile
Profile • The Expansion Profile describes a board that provides new capabilities and/or additional resources that would otherwise not be available in standard node instantiations. These modules are not intended to operate standalone and will usually not have individual processing capabilities. Rather, these boards will be populated with components that allow for...
Extended Capabilities
Profile • CH Node Extended Capabilities Customization and extension of CH node capabilities can be realized through instantiations of the Expansion Profile. In instances where custom electronics are needed (for example, spacecraft interfaces or attachments to expansion memory), mezzanines or custom backplane routing to other boards connect electronics to the CH node...
Extended Capabilities
Profile • RP Node Extended Capabilities The flexibility provided by FPGAs allows nodes built upon the RP profile to accommodate custom connectivity to other components, devices, or even other nodes. Customization and extension of RP node capabilities can be realized through instantiations of the Expansion Profile. In instances where custom electronics are...
External Interfaces
Profile • Depending on the nature of the expansion module and its integrated components, electronics modules built to the Expansion Profile will have varying needs with regard to communications interfaces. The Communication Specification is the authoritative document when the expansion module requires network connectivity. Discrete signals may be brought directly in to...
Functional Description
Profile • The CH profile defines the technologies that comprise the CH node, including both required and recommended components to define this standard node type. A CH node should be universally designed to minimize the number of unique instantiations of this profile. A block diagram of a CH node is shown below....
Functional Description
Profile • The Communication Profile defines standard methods for transferring data between two JAS nodes. This includes the use of protocols and packet formats by hardware and software. Applications become portable and reusable by using layered communication architecture. The applications should be agnostic to the choice of physical interconnect technology, which allows...
Functional Description
Profile • The Expansion Profile describes a class of supplemental boards designed to augment the capabilities of other profiles. These modules are not intended to operate standalone and will usually not have individual processing capabilities. Rather, these boards will be populated with components that allow for expanded capacity, expanded communications, or both....
Functional Description
Profile • The PS profile defines the technologies that comprise the PS node, including both required and recommended components to define this standard node type. A block diagram of a node instantiated against the PS profile is shown below: PS Profile Block Diagram The primary components for PS node instantiations will include...
Functional Description
Profile • The RP profile defines the technologies that comprise the RP node, including both required and recommended components to define this standard node type. An RP node should be universally designed to minimize the number of unique instantiations of this profile. A block diagram of an RP node is shown below:...
Functional Description
Profile • The SMAC is responsible for enabling the following capabilities on JAS nodes: Network (typically SpaceWire) router for command and control Control to read and drive discrete digital I/O and data buses Configuration of node FPGA(s) SOH reporting, including node temperatures, voltages, and currents Local and neighboring node power control Connectivity...
Gigabit Interfaces
Profile • Gigabit interfaces are those that run at line speeds of one gigabit per second and above (>1 Gbps). These interfaces are often tasked with the primary purpose of pushing large amounts of mission data to other nodes for processing. Some examples of these interfaces include: Serial RapidIO SpaceFibre Gigabit Ethernet...
Gigabit Interfaces
Profile • Gigabit interfaces are those that run at line speeds of one gigabit per second and above (>1 Gbps). These interfaces are often tasked with the primary purpose of pushing large amounts of mission data to other nodes for processing. Some examples of these interfaces include: Serial RapidIO SpaceFibre Gigabit Ethernet...
Gigabit Interfaces
Profile • Gigabit interfaces are those that run at line speeds of one gigabit per second and above (>1 Gbps). These interfaces are often tasked with the primary purpose of pushing large amounts of mission data to other nodes for processing. Some examples of these interfaces include: Serial RapidIO SpaceFibre Gigabit Ethernet...
High Speed Data Switch
Profile • Processing intensive systems may require many RP nodes to reduce large amounts of sensor data to an information set that can be downloaded to ground through bandwidth-limited downlinks. In many of these situations, processing will be distributed across many RP nodes connected through gigabit interfaces. A high-speed data switch could...
Host Vehicle Interface
Profile • The primary function of this instantiation is to enable connection between the CH node and host vehicle by providing appropriate connectors and bridging differing electrical signaling standards. A mezzanine connector, active transceivers, level shifters, and connectors for cabling to the host vehicle are common examples of components that would be...
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