Atmel SpaceWire Router SpW-10X Manual De Usuario

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

93

 

R1

1

2

3

4

5

6

76

Group adaptive routing packet with address 76 arrives at port 1

Ports 4 and 5 are busy routing packet data from ports 2 and 3

Address 76 – Routing table entry
Header Deletion disabled
Port 4
Port 5 
Port 6

1

2

R1

1

2

3

4

5

6

76

Routing logic assigns ports 6 to packet at port 1

 

8.3.3.3  Group adaptive routing when ports not ready 

A similar arrangement to that of section 8.3.3.2 is shown in Figure 8-12. In this scenario, two of the 
output ports which address 76 can use are not ready for use (i.e. the links are not running).  The 
packet is routed to output port 6 since it is running and not being used to route another packet. 

R1

1

2

3

4

5

6

76

Group adaptive routing packet with address 76 arrives at port 1

Ports 4 and 5 are not ready to accept packet data

Address 76 – Routing table entry
Header Deletion disabled
Port 4
Port 5 
Port 6

1

2

R1

1

2

3

4

5

6

76

Routing logic assigns ports 6 to packet at port 1

X
X

X
X

 

Note: if the Start on Request mode is enabled, the output ports in the group that are not ready will 
attempt to make a connection.  The packet will be routed to the output port in the group that is ready 
first. 

8.3.4 Loop-back with Self-Addressing 

The Enable Self-Addressing bit in the router control register determines if the router is to support loop-
back connections.  Loop-back connections can be useful for debugging or ping operations where a 
packet is “bounced” of the router and returned to the source.  If the Enable Self-Addressing bit is clear