Overview of SpaceWire RMAP IP Core and Applications

This content provides an overview of the SpaceWire RMAP IP Core developed by Steve Parkes, Chris McClements, and Martin Dunstan from the Space Technology Centre at the University of Dundee, along with Wahida Gasti from ESTEC. It discusses the architecture, testing, performance, and current/future work related to this core. Additionally, it highlights the usage of the UoD/STAR-Dundee IP Cores, particularly the SpaceWire CODEC widely used in the European space industry. The content also delves into the RMAP protocol, its features, applications, and usage in various space missions. Images are included to illustrate the concepts discussed.

• SpaceWire
• RMAP
• IP Core
• Space Technology
• European Space Industry

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1. SpaceWire RMAP IP Core Steve Parkes, Chris McClements, Martin Dunstan Space Technology Centre, University of Dundee Wahida Gasti ESTEC 1

2. Contents UoD / STAR-Dundee IP Cores RMAP Overview RMAP IP Core Context Architecture Testing Performance Current and Future Work 2

3. UoD / STAR-Dundee IP Cores SpaceWire CODEC (ESA-b) Widely used by European Space Industry Used in four Atmel ASICs AT7910E, AT7911E, AT7912E, AT7913E Used in many FPGA designs SpaceWire Router Highly flexible Highly capable Used in AT7910E SpW-10X Router ASIC JAXA-MMO SpW-RMAP Codec Low speed operation SpaceWire CODEC RMAP Target Specialised IP cores Used in STAR-Dundee products 3

4. RMAP Overview Remote Memory Access Protocol Provide a means of Writing to Reading from Registers or memory on a SpaceWire node Over a SpaceWire network Registers are considered to be memory mapped Simple and effective Flexible Encompassing diverse applications Being used on Bepi Colombo, MMS, ExoMars, ... ECSS standard Issued standard expected early 2009 4

5. Context - RMAP Initiator SpaceWire Packet Containing RMAP Command Request to Send RMAP Command RMAP Command Initiator User Logic Initiator RMAP Interface SpW Interface 5

6. Context - RMAP Target SpaceWire Packet Containing RMAP Command Write/Read /RMW Operation RMAP Command Target RMAP Interface SpW Interface Target Memory SpaceWire Packet Containing RMAP Reply Any Data Read RMAP Reply 6

7. Context - RMAP Initiator Reply Initiator User Logic Initiator RMAP Interface SpW Interface SpaceWire Packet Containing RMAP Reply Status, Error Code, Or Data RMAP Reply 7

8. Context INITIATOR ONLY NODE SpW I/F INITIATOR/TARGET NODE INI User SpaceWire Network User INI TARGET ONLY NODE SpW I/F SpW I/F TGT Mem Mem TGT TARGET ONLY NODE SpW I/F TGT Mem 8

9. RMAP Write Command First byte transmitted Target SpW Address .... Target SpW Address Target Logical Addr Reply Address Reply Address Protocol Identifier Reply Address Reply Address Instruction Reply Address Reply Address Key Reply Address Reply Address Reply Address Reply Address Reply Address Reply Address Initiator Logical Addr Transaction ID (MS) Transaction ID (LS) Extended Address Address (MS) Address Data Length (MS) Data Length Data Data Data ... Data Data CRC Address (LS) Header CRC Data Data Address Data Length (LS) Data ... EOP Last byte transmitted 9

10. RMAP Write Reply First byte transmitted Reply SpW Address .... Reply SpW Address Initiator Logical Addr Protocol Identifier Instruction Status Target Logical Addr Transaction ID (MS) Transaction ID (LS) Header CRC Last byte transmitted EOP 10

11. SpaceWire Network SpaceWire Interface RMAP Handler DMA Controller User Memory/ RegisterBus SpaceWire RMAP Command RMAP Header Check Header Address Data length RMAP Data Authorisation Request Authorisation Grant Check Data Start Bus Request Bus Grant Start Ack Address Data Data Data Data Relinquish Bus Done RMAP Reply Indicate SpaceWire RMAP Reply 11

12. Target Architecture User Interface RMAP Initiator Handler Initiator DMA Cntrl SpaceWire Protocol De-Mux SpW Packet Loop- Back Target DMA Cntrl RMAP Target Handler SpW I/F Protocol Mux Time- Code Handler 12

13. Initiator Architecture User Interface SpaceWire Time-Code Handler Non RMAP SpaceWire Interface Protocol De-Mux SpW Packet Loop- Back RMAP RMAP Master Controller Non RMAP DMA Controller Protocol Mux RMAP 13

14. Configurable IP Core Highly configurable RMAP IP Core E.g. Data bus width Endian-ness Bit Swapping Verify buffer size DMA burst size DMA watchdog Loop back enable Initiator/Target RMAP send reply on EEP ... 14

15. Testing RMAP Target Extensive test bench Full code coverage All error conditions exercised Implemented in Xilinx FPGA Implemented in Actel AX1000 15

16. Xilinx Test Board Breakout Connectors FPGA SpW Daughterboard 16

17. Actel AX1000 Test Board Actel AX1000 Xilinx FPGA LVDS 17

18. Performance RMAP Target Xilinx Spartan-3 FPGA 200 Mbits/s transmit and receive RMAP core handles data at these speeds Actel AX1000 FPGA Initial implementation 100 Mbits/s transmit 150 Mbits/s receive 18

19. Footprint Initial results: Xilinx Virtex IV (4VFX20) 889 CLBs (10.4%) RMAP core only 1168 CLBs (13.7%) RMAP + SpW Actel AX1000 2025 modules (17%) RMAP core only 4551 modules (26%) RMAP + SpW 19

20. Current and Future Work Currently working on initiator design Once complete will optimise Actel FPGA performance Two alpha customers running tests on RMAP IP core 20

21. Availability Available from ESA for use on ESA projects only Available from STAR-Dundee for all other projects 21