Atmel SpaceWire Router SpW-10X - Manual (Page 116)

Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual Date: 11 th
July 2008
Preliminary
116
Device Type
0 7 3 8 4
Return Port
Ports in run state
31
Figure 9-4 Network Discovery Register Fields
Table 9-8 Network Discovery Register Fields
Bits Description Reset
Value
Usage Read/Write
3:0 Device Type “0001” The device type field indicates the type of device
which is associated with this network discovery
register. At present there is only one device type
defined, the Router, along with the unknown device
type.
“0000” – Unknown Device
“0001” – Router
R
7:4 Return Port All bits
set to
zero Indicates the input port number which accessed this
network discovery register. R
31:8 Ports in Run
state
All bits
set to
zero Indicates the SpaceWire ports which are in the run
state. Bit 8 corresponds to SpaceWire port 1.
The external ports are the highest numbered port and
the corresponding register bits are set to one. In this
way a network manager can determine the number of
ports and the active ports in one register read.
R
9.5.2 Router Identity Register
The router identity register address is 257 (0x0000 0101).
The router identity register allows a network manager to assign a 32 bit ID to a SpaceWire router
device by writing to this register. It may also be used for other purposes. The router identity register is
described in Table 9-9.