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13.5 Encoding (Format) of Transactions
13.5.1
Header and EOP Coding
DEST
Destination address of the packet
8 bit field
CNTRL 8 bit control word for commands and acknowledges
according to para. 5.2
TID
Transaction identifier of the packet
Unique number generated by the requester to identify acknowledges
8 bit field
SRC
Source address of the packet
8 bit field
EOP
End of Packet marker
13.5.2
Control Word Coding Specification
Bit
Content
7 (MSB)
Request/Acknowledge Packet
0 = Acknowledge
1 = Request
6
Acknowledge OK or Error
0 = Transaction Error Acknowledge
1 = OK Acknowledge
This bit is not interpreted if the packet is a request packet.
5,4
Request Type Packet Specification (see table below)
3
Command Specification (see table below)
2,1,0
Detailed Command Specification (see table below)
Bits 5-0 are simply mirrored into the respective bits of an acknowledge control word
Request Type and Command Specification Table
SMCS332SpW
User Manual
– All Rights Reserved – Copyright per DIN 34 –
EADS Astrium GmbH, ASE2
Doc No: SMCS_ASTD_UM_100
Issue:
1.4
Updated: 9-Sep-2006
Page:
122 of 131
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