Atmel SpaceWire Router SpW-10X User Manual

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

70

 

logical address  

SpaceWire router does not have a logical address. 

Transaction 

Identifier  

The transaction identifier identifies the command packet and reply packet 

with a unique number. The transaction identifier in the reply packet is 

copied from the command packet and returned in this field, so that the 

command and the corresponding reply have the same transaction 

identifier value. 

2 

Data Length  

The data length field is set to 4 bytes as 4 bytes are returned in the 

Read-Modify-Write command. 

3 

Header CRC  

The header CRC used to detect errors in the header part of the 

command packet. See section 7.6.7 for CRC generation. 

1 

Data  

The data read from the SpaceWire router registers before the modify 

operation is performed. 

4 

Data CRC  

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

See section 7.6.7 for CRC generation. 

1 

 

7.6.5 Write Command 

The write command characteristics of the SpaceWire router are defined in Table 7-14. 

Action Supported/ 

Not Supported 

Maximum number 
of bytes 

Non-aligned access 
accepted 

8-bit write 

NS 

- 

- 

16-bit write 

NS 

- 

- 

32-bit write 

S 

4 

No 

64-bit write 

NS 

- 

- 

Word or byte address 

32-bit aligned 

Accepted Logical Addresses 

0xFE 

Accepted destination keys 

0x20 at power on 

Accepted address ranges 

0x00 0000 0000 – 0x00 0000 0109 

Incrementing address 

No