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Spw-10x spacewire router, User manual, Preliminary – Atmel SpaceWire Router SpW-10X User Manual

Page 64: Ref.: uod_spw-10x_ usermanual issue: 3.4, Date: 11, July 2008

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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

0

0

1

1

0

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