Atmel SpW-10X Network Router User Manual


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Ref.:
UoD_SpW-10X_
UserManual
Issue:
3.4
SpW-10X
SpaceWire Router
User Manual
Date:
11
th
July 2008
Preliminary
64
In Figure 7-6 the format of the reply to a read incrementing 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
Protocol Identifier
01h
Packet Type, Command,
Source Path Addr Len
Status
Destination Logical Address
FEh
Transaction Identifier (MS) Transaction Identifier (LS) Reserved = 0
Data Length (MS)
00h
Data Length Data Length (LS) Header CRC
Data (Word 0 MSB) Data Data Data (Word 0 LSB)
Source Path Address Source Path Address
Data (Word 1 MSB) Data Data Data (Word 1 LSB)
Data CRC
EOP
First byte transmitted
Last byte transmitted
0 00 110
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
Data (Word n MSB) Data Data Data (Word n LSB)
Data (Word n-1 MSB) Data Data Data (Word n-1 LSB)
Figure 7-6 Read Incrementing Address Reply Packet Format
Table 7-10 Read Incrementing Address Reply Packet Fields
Field Description Bytes
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.
0-12
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.
1
Protocol
Identifier
The RMAP protocol identifier value 01h. 1
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