Atmel SpaceWire Router SpW-10X User Manual

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

57

 

Action Supported/ 

Not Supported 

Maximum number 
of bytes 

Non-aligned access 
accepted 

8-bit read 

NS 

- 

- 

16-bit read 

NS 

- 

- 

32-bit read 

S 

4 

No 

64-bit read 

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 

Address Incrementation 

No 

 

The RMAP read single address command is supported in the SpaceWire router. The single address 
command is used to read a single 32 bit register location from the router registers.  

In Figure 7-3 the format of a read single address command is illustrated. The first byte received 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. 

Read Address

Read Address (LS)

Header CRC

Packet Type, Command

Source Path Addr Len

Destination Key

Source Path Address

Source Path Address

Source Path Address

Source Path Address

Source Logical Address

Transaction Identifier (MS)

Transaction Identifier (LS)

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

MSB

Packet Type

Command

Source Path

Address Length

Source Path

Address Length

LSB

Source Path Address Length