Atmel SpW-10X Manuel D’Utilisation

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

59

 

Length  

one 32 bit register location. 

Header 

CRC  

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

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

executed 

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In Figure 7-4 the format of the reply to a read single address command is illustrated. The first byte sent 
by the SpaceWire router configuration logic is the port address followed by the destination logical 
address. Fields which are depicted in bold text are expected values. Fields which are shaded are 
optional. Note that the reply is always sent out of the same port as the command was received on. 
The Source Path Address should not include the output port of the router being commanded as the 
reply will be automatically sent out of the same port that the command arrived on. See section 7.6.8. 

Source Path Address

Source Logical Address

Packet Type, Command,

Source Path Addr Len

Status

Transaction Identifier (MS)

Transaction Identifier (LS)

Header CRC

Data (Word 0 MSB)

Data

Data

Data (Word 0 LSB)

Source Path Address

Source Path Address

Data CRC

Bits in Packet Type / Command / Source Address Path Length Byte

MSB

Packet Type

Command

Source Path

Address Length

Source Path

Address Length

LSB

Source Path Address Length

 

 

Source 

Path 

Address  

Optional source path addresses specified in the command packet. If no source 

path addresses are specified then the first byte will be the source logical 

address. 

>=0 

Source 

Logical 

Address  

The source logical address specified in the command packet. If source path 

addresses are not used then the source logical address is the address of the 

return packet. 

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