SpW-10X

Ref.:

UoD_SpW-10X_

SpaceWire Router

 

UserManual

Issue:

3.4

User Manual

Date:

11th July 2008

 

 

 

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

Description

Read/Write

 

 

Value

 

 

 

 

 

 

 

7:0

DESTKEY

20h

The destination key is checked when a security key is

R/W

 

 

 

required for RMAP configuration packets to access the

 

 

 

 

router registers.

 

 

 

 

 

 

31:8

Not used

All bits set

-

 

 

 

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.

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.

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.

Preliminary

127

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Atmel SpW-10X Destination Key Register, Unused Registers and Register Bits, Empty packets, Writing to a READ-ONLY Register