Atmel SpW-10X user manual SpaceWire Router, Preliminary

SpW-10X	Ref.:	UoD_SpW-10X_
SpaceWire Router		UserManual
	Issue:	3.4
User Manual
	Date:	11th July 2008

The RMAP write single address, with data verify and acknowledgement command is supported in the SpaceWire router. The RMAP write command is used to write a 32 bit value into one of the SpaceWire router registers.

In Figure 7-10 the first byte received by the SpaceWire router configuration logic is the port address followed by the destination logical address. Fields which are depicted in bold text are expected values. Fields which are shaded are optional.

								Config Port Address
								00h
Destination Logical Address			Protocol Identifier			Packet Type, Command,		Destination Key
	FEh			01h		Source Path Addr Len
Source Path Address			Source Path Address			Source Path Address		Source Path Address
Source Logical Address			Transaction Identifier (MS)			Transaction Identifier (LS)		Extended Write Address
								00h
Write Address (MS)			Write Address			Write Address		Write Address (LS)
	00h			00h
Data Length (MS)			Data Length			Data Length (LS)		Header CRC
	00h			00h		04h
	Data (MSB)			Data		Data		Data (LSB)
	Data CRC		EOP
Bits in Packet Type / Command / Source Path Address Length Byte
MSB										LSB
0		1	1		1	1	0	Source Path	Source Path
								Address Length	Address Length
	Packet Type				Command			Source Path Address Length

Figure 7-10 Write Single Address Command Packet

Table 7-15 Write Single Address Command Packet Fields

Field	Description	Bytes
Config Port	The configuration port address field routes the packet to the configuration	1
Address	port of the router. The configuration port address is always present when
	configuring the SpaceWire Router.
Destination	The destination logical address is not used in the SpaceWire Router. The	1
Logical	SpaceWire router accepts packets which have the default destination logical
Address	address of 254h (FEh).
Protocol	The RMAP protocol identifier is 01h.	1
Identifier

Preliminary 71