Atmel SpW-10X Packet Priority, Packet Header Deletion, SpaceWire Router, User Manual, Preliminary

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

7.2 PACKET PRIORITY

Each packet which is input to the router has an associated priority level, either as a result of the packet address or the internal routing table. Two priority levels HIGH and LOW are supported.

The table below defines the priority levels for packet addresses

Table 7-2 Packet Priority Mapping

Packet Address	Packet Priority	Physical Port type
0	HIGH	Configuration port
1	HIGH	SpaceWire link port 1
2	HIGH	SpaceWire link port 2
3	HIGH	SpaceWire link port 3
4	HIGH	SpaceWire link port 4
5	HIGH	SpaceWire link port 5
6	HIGH	SpaceWire link port 6
7	HIGH	SpaceWire link port 7
8	HIGH	SpaceWire link port 8
9	HIGH	External FIFO port 1
10	HIGH	External FIFO port 2
11-31	N/A	Invalid addresses
32-255	Dependent on routing table	Logical addresses
	- Default LOW
	- May be configured HIGH (see section
	9.3)

7.3 PACKET HEADER DELETION

Header deletion is performed on packets dependent on the packet address. Packets which have path addresses or logical addresses which have the header deletion bit set in the routing table have the header address byte removed before the packet is routed to the destination.

The table below defines the header deletion settings for each address.

Preliminary 53