Atmel SpaceWire Router SpW-10X User Manual
Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual
Date: 11
th
July 2008
Preliminary
127
9.5.10 Destination Key Register
The Destination Key register address is 265 (0x0000 0109).
The destination key register fields are listed in the table below.
Table 9-16 Destination Key Register
Bits Name
Reset
Value
Value
Description Read/Write
7:0
DESTKEY 20h
The destination key is checked when a security key is
required for RMAP configuration packets to access the
router registers.
required for RMAP configuration packets to access the
router registers.
R/W
31:8 Not used
All bits set
to zero
to zero
-
9.5.11 Unused Registers and Register Bits
If an unused register address is referenced in a configuration command then the command will not be
acted upon and a NACK will be sent in the reply to the command.
acted upon and a NACK will be sent in the reply to the command.
All unused bits in valid configuration registers will return ‘0’ when read.
9.5.12 Empty packets
An empty packet received at the configuration port is discarded by the configuration port and no reply
packet is sent. An empty packet has no address or cargo bytes and consists only of an EOP.
packet is sent. An empty packet has no address or cargo bytes and consists only of an EOP.
9.6 WRITING TO A READ-ONLY REGISTER
If a write command is sent with a register address that corresponds to a register whose entire contents
is read only, then an appropriate error will be generated. See section 9.4.2.
is read only, then an appropriate error will be generated. See section 9.4.2.