Atmel SpW-10X user manual Source Path Address Field, SpaceWire Router, User Manual, Preliminary

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

7.6.9 Source Path Address Field

The RMAP command field “source path address length” indicates the number of source path addresses which are expected in the packet. Up to 12 source path addresses can be accepted by the router configuration port. The source path addresses shall be decoded by the SpaceWire router as follows.

•Leading zero source path address bytes are not returned in the RMAP reply packet.

•If the source path address contains only zero bytes the Source Path Address Sequence error is reported, see section 7.6.6.

•After the first non zero byte in the packet any following zeros shall be treated as an error. A source path address sequence is reported, see section 7.6.6.

The table below gives some examples of how to set the source path address length and packet address fields for the required path addresses

	Table 7-18 Source Path Address Reference Table
Source Path Address		RMAP Source Path Address fields						Reply Path Address
Length		(FirstÆLast Transmitted)						(FirstÆLast Reply)
0		None						None
1		[00	00 00	20]				20
1		[00	02 08	09]				02 08 09
1		[01	02 03	04]				01 02 03 04
2		[00	00 00	00]	[00	00 00	02]	02
2		[00	00 00	00]	[01	02 03	02]	01 02 03 02
2		[00	00 12	01]	[02	B2 03	05]	12 01 02 B2 03 05
2		[00	32 01	02]	[07	02 05	08]	32 01 02 07 02 05 08
1		[00	00 00	00]				Invalid
2		[00	00 00	00]	[00	00 00	00]	Invalid
1		[00	02 00	01]				Invalid
1		[00	A3 00	00]				Invalid
2		[00	02 03	00]	[01	00 00	00]	Invalid
2		[00	00 00	02]	[00	00 01	00]	Invalid
2		[00	00 00	00]	[02	03 00	01]	Invalid
					Preliminary			77