82583V Datasheet, PDF (83/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Interconnects—82583V GbE Controller
6.1.3.2
Table 26.
Transaction Type
Memory Write
Request
I/O Read Request
I/O Write Request
Read Completions
Message
FC Type
PH +
PD
NPH
NPH +
NPD
CPLH +
CPLD
PH
Tx Later
Reaction
Hardware Should Keep
Data From Original Packet
For Client
-
-
CSR
CPLH + CPLD Requester ID, TAG, Attribute CSR
CPLH
Requester ID, TAG, Attribute CSR
-
-
-
-
DMA
Message Unit / INT / PM
/ Error Unit
Flow control types:
• PH - Posted request headers
• PD - Posted request data payload
• NPH - Non-posted request headers
• NPD - Non-posted request data payload
• CPLH - Completion headers
• CPLD - Completion data payload
Transaction Types Initiated by The 82583V
Transaction Types at the Tx Transaction Layer
6.1.3.3
Transaction Type
Payload Size
FC Type
From Client
Configuration Read Request
Completion
Configuration Write Request
Completion
I/O Read Request Completion
I/O Write Request Completion
Read Request Completion
Memory Read Request
Memory Write Request
Message
Dword
-
Dword
-
Dword/Qword
-
<= MAX_PAYLOAD_SIZE¹
-
CPLH + CPLD
CPLH
CPLH + CPLD
CPLH
CPLH + CPLD
NPH
PH + PD
PH
Configuration space
Configuration space
CSR
CSR
CSR
DMA
DMA
Message Unit / INT /
PM / Error Unit
1. The MAX_PAYLOAD_SIZE supported is loaded from the NVM (either 128 bytes or 256 bytes). Effective
MAX_PAYLOAD_SIZE is according to configuration space register.
Message Handling by The 82583V (as a Receiver)
Message packets are special packets that carry a message code.
The upstream device transmits special messages to the 82583V by using this
mechanism.
The transaction layer decodes the message code and responds to the message
accordingly.
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