SpW-10X

Ref.:

UoD_SpW-10X_

 

 

 

 

SpaceWire Router

 

UserManual

 

 

 

 

Issue:

3.4

 

 

 

 

 

User Manual

 

 

 

 

 

Date:

11th July 2008

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 7-12 Read-Modify-Write Command Packet Fields

 

 

 

 

 

 

 

 

 

 

 

 

Packet

 

Description

 

 

Bytes

 

 

Field

 

 

 

 

 

 

 

 

 

 

Config Port

The configuration port address field routes the packet to the configuration

1

 

Address

port of the router. The configuration port address is always present when

 

 

 

 

configuring the SpaceWire Router.

 

 

 

 

 

 

 

 

Destination

The destination logical address is not used in the SpaceWire Router. The

1

 

Logical

SpaceWire router accepts packets which have the default destination logical

 

 

Address

address of 254h (FEh).

 

 

 

 

 

 

 

 

 

 

Protocol

The RMAP protocol identifier is 01h.

 

 

1

 

Identifier

 

 

 

 

 

 

 

 

 

 

Command

The command byte indicates a read-modify-write command. The Source path

1

 

Byte

address length fields are set to the number of source path addresses

 

 

 

 

 

required as defined in section 7.6.9.

 

 

 

 

 

 

 

 

Destination

The destination key identifier must match the contents of the destination key

1

 

Key

register, see section 9.5.10.

 

 

 

 

 

 

 

 

Source

The source path address field is used to add source path addresses to the

0,4,8,16

 

Path

head of the reply packet. The expected number of source path addresses is

 

 

Address

specified in the command byte. See section 7.6.9 for source path address

 

 

 

 

decoding.

 

 

 

 

 

 

 

 

Source

The source logical address should be set to the logical address of the node

1

 

Logical

which sent the command.

 

 

 

 

Address

 

 

 

 

 

 

 

 

 

 

Transaction

The transaction identifier identifies the command packet and reply packet

2

 

Identifier

with a unique number.

 

 

 

 

 

 

 

 

Extended

The extended read address is not used in the SpaceWire router and shall

1

 

RMW

always be set to zero.

 

 

 

 

Address

 

 

 

 

 

 

 

 

 

 

RMW

The read-modify-write address identifies the SpaceWire router register

4

 

Address

address to modify. Valid RMW addresses are defined in section 9.

 

 

 

 

 

 

 

Data +

The data length of the read-modify-write command is 8, 4 bytes for data and

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Preliminary

 

 

67

 

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Atmel SpW-10X user manual Rmw