Atmel SpW-10X user manual Write Command, SpaceWire Router, User Manual, Preliminary

		SpW-10X	Ref.:	UoD_SpW-10X_
		SpaceWire Router		UserManual
			Issue:	3.4
		User Manual
			Date:	11th July 2008
logical address	SpaceWire router does not have a logical address.
Transaction	The transaction identifier identifies the command packet and reply packet				2
Identifier	with a unique number. The transaction identifier in the reply packet is
	copied from the command packet and returned in this field, so that the
	command and the corresponding reply have the same transaction
	identifier value.
Data Length	The data length field is set to 4 bytes as 4 bytes are returned in the				3
	Read-Modify-Write command.
Header CRC	The header CRC used to detect errors in the header part of the				1
	command packet. See section 7.6.7 for CRC generation.
Data	The data read from the SpaceWire router registers before the modify				4
	operation is performed.
Data CRC	The data CRC used to detect errors in the data part of the reply packet.				1
	See section 7.6.7 for CRC generation.

7.6.5 Write Command

The write command characteristics of the SpaceWire router are defined in Table 7-14.

Table 7-14 Write Command Characteristics
			Non-aligned access
Action	Supported/	Maximum number
	Not Supported	of bytes	accepted
			-
8-bit write	NS	-
			-
16-bit write	NS	-
			No
32-bit write	S	4
			-
64-bit write	NS	-
Word or byte address	32-bit aligned
Accepted Logical Addresses	0xFE
Accepted destination keys	0x20 at power on
Accepted address ranges	0x00 0000 0000 – 0x00 0000 0109
Incrementing address	No
	Preliminary		70