Atmel SpW-10X user manual Node Interface, Embedded Router

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

2.2 NODE INTERFACE

The SpaceWire Router has two external ports which enable the device to be used as a node interface. The equipment to be connected to the SpaceWire network is attached to one or both external ports. One or more SpaceWire ports are used to provide the connection into the SpaceWire network. Unused SpaceWire ports may be disabled and their outputs deactivated to save power. In this arrangement configuration of the routing tables and other parameters may be done by sending configuration packets from the local host via an external port or from a remote network manager via a SpaceWire port.

Active

SpaceWire

Links

	SpW‐10X	User FPGA
		or
Disabled	Router
		Processor
SpaceWire
Links

SpaceWire Node

Figure 2-2 Node Interface

In Figure 2-2 a SpW-10X router is used as an interface to a user FPGA or processor, which may be part of a SpaceWire enabled instrument, control processor or other sub-system. The interface to the user FPGA or processor is via the external FIFO ports of the SpW-10X router. Only three SpaceWire links are needed for this SpaceWire node so the other five links are disabled to save power.

2.3 EMBEDDED ROUTER

The SpaceWire Router device can also be used to provide a node with an embedded router. In this case the external ports are used to provide the local connections to the node and the SpaceWire ports are used to make connections to other ports in the network. The difference between this configuration and that of section 2.2 is just a conceptual one with the Node interface configuration normally using fewer SpaceWire ports than the Embedded Router configuration.

Preliminary 17