Atmel SpaceWire Router SpW-10X - Manual (Page 60)

Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual Date: 11 th
July 2008
Preliminary
60
Protocol
Identifier
The RMAP protocol identifier value 01h. 1
Command
Byte
Read single address reply command byte. The packet type bits in the
command byte indicate this packet is a response packet.
1
Status The command status is returned in this field. The command status can be
command successful or an RMAP error code as defined in section 7.6.6.
1
Destination
logical
address
The destination logical address is set to the default value FEh as the
SpaceWire router does not have a logical address.
1
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 this is a single read 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 registers in the device. 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
7.6.3 Read Incrementing Command
The read incrementing address characteristics of the SpaceWire router are defined in Table 7-8.