SpW-10X

Ref.:

UoD_SpW-10X_

 

 

 

 

SpaceWire Router

 

UserManual

 

 

 

 

Issue:

3.4

 

 

 

 

 

User Manual

 

 

 

 

 

Date:

11th July 2008

 

 

 

 

 

 

 

 

 

 

 

 

 

Command

The command byte indicates a write single address, with verification and

1

 

Byte

acknowledgement packet. The Source path address length fields are set to

 

 

 

 

the number of source path addresses required as defined in section 7.6.9.

 

 

 

 

 

 

Destination

The destination key identifier must match the contents of the destination key

1

 

Key

register, see section 9.5.10.

 

 

 

 

 

 

 

 

Source

The source path address field is used to add source path addresses to the

0,4,8,12

 

Path

head of the reply packet. The expected number of source path addresses is

 

 

Address

specified in the command byte. See section 7.6.9 for source path address

 

 

 

 

decoding.

 

 

 

 

 

 

 

 

Source

The source logical address should be set to the logical address of the node

1

 

Logical

which sent the command.

 

 

 

 

Address

 

 

 

 

 

 

 

 

 

 

Transaction

The transaction identifier identifies the command packet and reply packet

2

 

Identifier

with a unique number.

 

 

 

 

 

 

 

 

Extended

The extended write address is not used in the SpaceWire router and is

1

 

Write

always expected to be zero.

 

 

 

 

Address

 

 

 

 

 

 

 

 

 

 

Write

The write address identifies the register to write the RMAP data. The valid

4

 

Address

write addresses are defined in section 9.

 

 

 

 

 

 

 

 

Data

The data length of a write single address command is expected to be 4 bytes,

3

 

Length

to write to a 32 bit register location

 

 

 

 

 

 

 

 

Header

The header CRC is the eight bit CRC code used to detect errors in the

1

 

CRC

command packet. The CRC code is checked before the command is

 

 

 

 

 

executed

 

 

 

 

 

 

 

 

 

Data

The 32 bit data value to write to the SpaceWire router register.

 

4

 

 

 

 

 

Data CRC

The data CRC used to detect errors in the data part of the command packet.

1

 

 

 

 

 

 

 

 

 

Preliminary

72

Page 72
Image 72
Atmel SpW-10X user manual Crc