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...
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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...
Functional Description
Specification • The JEEP provides efficient, best-effort delivery of packets. In-order delivery is only guaranteed if there are no transmission errors over the SpaceWire link, e.g., bit errors or dropped packets, and there are no routing options which could cause a segmented packet to be transmitted or received out of order. JEEP...
Fundamental Frequency
Specification • The first mode of the JAS mechanical structure shall be greater than 500 Hz when mounted to a rigid surface.
Gasketing
Specification • The JAS mechanical structure shall use EMI gasketing to reduce EMI emissions as appropriate for the intended application.
Generalized Star
Other • The generalized star topology is a topology that attempts to wire the network together in such a way that each node is the center of a small star (see Figure). Given a dimension d, these networks will have d! nodes and each node will have a fixed degree of d-1....
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...
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