Atmel SpaceWire Router SpW-10X User Manual

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

21

 

A SpaceWire routing switch comprises a number of SpaceWire ports and a routing matrix. The routing 
matrix enables packets arriving at one SpaceWire port to be transferred to and sent out of another port 
on the routing switch. A SpaceWire routing switch is thus able to connect together many SpaceWire 
nodes, providing a means of routing packets between the nodes connected to it. 

The SpW-10X SpaceWire router comprises the following functional logic blocks: 

•  Eight SpaceWire bi-directional serial ports. 

•  Two external parallel input/output ports each comprising an input FIFO and an output FIFO. 

•  A crossbar switch connecting any input port to any output port. 

•  An internal configuration port accessible via the crossbar switch from the external parallel 

input/output port or the SpaceWire input/output ports. 

•  A routing table accessible via the configuration port which holds the logical address to output 

port mapping. 

•  Control logic to control the operation of the switch, performing arbitration and group adaptive 

routing. 

•  Control registers than can be written and read by the configuration port and which hold control 

information e.g. link operating speed. 

•  An external time-code interface comprising tick_in, tick_out and current tick count value. 

•  Internal status/error registers accessible via the configuration port. 

•  Watchdog timers on all ports. 
•  Internal status/error registers accessible via the configuration port using the RMAP protocol 

[2]. 

• External 

status/error 

signals. 

 

A block diagram of the routing switch is given in Figure 3-1.