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17-Sep-2014
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ECSS-E-ST-50-5x series

The ECSS-E-ST-50-5x series of Standards were published in February 2010.

These Standards specify a series of communication protocols that are used in conjunction with the SpaceWire Standard (ECSS-E-ST-50-12C). The scope of these Standards is the spacecraft onboard communications protocols that work over SpaceWire to provide a comprehensive set of services for onboard user applications.

ECSS-E-ST-50-51C SpaceWire protocol identification

There is a number of communication protocols that can be used in conjunction with the SpaceWire Standard (ECSS-E-ST-50-12C), to provide a comprehensive set of services for onboard user applications. These protocols are covered by the ECSS-E-ST-50-5x series.

To distinguish between the various protocols a protocol identifier is used. This Standard specifies this protocol identifier. This standard may be tailored for the specific characteristic and constrains of a space project in conformance with ECSS-S-ST-00.

The following Table contains the Protocol identifier allocation:

Protocol identifier allocation Table

Download 417-R-RPT-0050_GRDDP_Rev2.1.pdf

Download STUP_protocol_v1.1_s.pdf

ECSS-E-ST-50-52C SpaceWire - Remote memory access protocol

This Standard specifies the Remote Memory Access protocol (RMAP), which is one of these protocols that works over SpaceWire.
The aim of RMAP is to support reading from and writing to memory in a remote SpaceWire node. RMAP can be used to configure a SpaceWire network, control SpaceWire nodes, and to transfer data to and from SpaceWire nodes. RMAP is specified in this Standard.

The remote memory access protocol (RMAP) has been designed to support a wide range of SpaceWire applications. Its primary purpose however is to configure a SpaceWire network, to control SpaceWire units and to gather data and status information from those units. RMAP may operate alongside other communications protocols running over SpaceWire.

RMAP may be used to configure SpaceWire routing switches, setting their operating parameters and routing table information. It may also be used to monitor the status of those routing switches. RMAP may also be used to configure and read the status of nodes on the SpaceWire network. For example, the operating data rate of a node may be set to 100 Mbits/s and the interface may be set to auto-start mode. For simple SpaceWire units without an embedded processor, RMAP may be used to set application configuration registers, to read status information and to read or write data into memory in the unit.

For intelligent SpaceWire units RMAP can provide the basis for a wide range of communications services. Configuration, status information, data transfer to and from memory or mailboxes can be supported.

ECSS-E-ST-50-53C SpaceWire - CCSDS packet transfer protocol

This Standard specifies the CCSDS packet transfer protocol, which is one of the protocols that works over SpaceWire.

The aim of the CCSDS Packet Transfer Protocol is to transfer CCSDS Packets across a SpaceWire network. It does this by encapsulating the CCSDS Packet in a SpaceWire packet, transferring it across the SpaceWire network and then extracting the CCSDS Packet at the target.

Earlier versions of the Draft Standard

Protocol ID Specification

RMAP Protocol Specification

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