Atmel SpW-10X user manual Invalid Addresses, SpaceWire Router, User Manual, Preliminary

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

Table 7-3 Packet Header Deletion Mapping

Packet Address Header Deletion

0Enabled

1Enabled

2Enabled

3Enabled

4Enabled

5Enabled

6Enabled

7Enabled

8Enabled

9Enabled

10Enabled

11-31N/A

32-255	Dependent on routing table (default not
	enabled)

Physical Port type

Configuration port SpaceWire link port 1 SpaceWire link port 2 SpaceWire link port 3 SpaceWire link port 4 SpaceWire link port 5 SpaceWire link port 6 SpaceWire link port 7 SpaceWire link port 8 External FIFO port 1 External FIFO port 2 Invalid addresses Logical addresses

Note that header deletion is always enabled for path addresses and cannot be changed by configuration. Header deletion for logical addresses can be enabled or disabled via a configuration register (see section 9.3).

7.4 INVALID ADDRESSES

Packets which have invalid addresses are discarded by the routing control logic. Path addresses which are in the range 11-31, logical addresses which are set as invalid in the routing table and empty packets (packets with no address or cargo) input to the external port are flagged as invalid packet addresses.

A packet address error is also generated when a packet address causes the packet to be routed back through the port on which the packet was received, i.e. a loop-back, and the router control register bit address self is not enabled.

When an invalid address packet is received by the router then the routing control logic flags the error to the corresponding port status register, spills the packet address, data and end of packet marker and waits for the next packet.

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