Atmel SpaceWire Router SpW-10X - Manual (Page 62)

Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual Date: 11 th
July 2008
Preliminary
62
In Figure 7-5 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 (MS)
00h
Read Address
00h
Read Address Read Address (LS)
Data Length (MS)
00h
Data Length Data Length (LS) Header CRC
Config Port Address
00h
EOP
Last Byte Received
Destination Logical Address
FEh
Protocol Identifier
01h
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)
Extended Read Address
00h
0 0 1 1 1 0
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
First Byte Received
Figure 7-5 Read Incrementing Address Command Format
Table 7-9 Read Incrementing Address Command Packet Fields
Field Description Bytes
Config Port
Address
The configuration port address field routes the packet to the configuration
port of the router. The configuration port address is always present when
configuring the SpaceWire Router.
1
Destination
Logical
Address
The destination logical address is not used in the SpaceWire Router. The
SpaceWire router accepts packets which have the default destination logical
address of 254h (FEh).
1
Protocol
Identifier
The RMAP protocol identifier is 01h. 1
Command
Byte
The command byte indicates a read incrementing packet. The Source path
address length fields are set to the number of source path addresses
required as defined in section 7.6.9.
1