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Intel
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82575EB Gigabit Ethernet Controller — Link Partner Ability Next Page - PCS_LPABNP
(04224h; RO)
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
376 January 2011
14.3.82 Link Partner Ability Next Page - PCS_LPABNP
(04224h; RO)
14.4 DCA Registers
This section contains detailed descriptions for those registers associated with the 82575’s DCA
capabilities.
14.4.1 Rx DCA Control Registers - RXCTL (02814h 100h
*n [n=0..3]; R/W)
Note: RX data write no-snoop is activated when the NSE bit is set in the receive descriptor.
• Queue0 - RXCTL0 (02814h)
• Queue1 - RXCTL1 (02914h)
• Queue2 - RXCTL2 (02A14h)
Field Bit(s)
Initial
Value
Description
CODE 10:0 - Message/Unformatted Code Field
The Message Field is a 11-bit wide field that encodes 2048 possible messages.
Unformatted Code Field is a 11-bit wide field that might contain an arbitrary value.
TOGGLE 11 - Toggle
This bit is used to ensure synchronization with the Link Partner during Next Page
exchange. This bit always takes the opposite value of the Toggle bit in the previously
exchanged Link Code Word. The initial value of the Toggle bit in the first Next Page
transmitted is the inverse of bit 11 in the base Link Code Word and, therefore, can
assume a value of 0b or 1b. The Toggle bit is set as follows:
0b = Previous value of the transmitted Link Code Word when 1b
1b = Previous value of the transmitted Link Code Word when 0b.
ACK2 12 - Acknowledge 2
Used to indicate that a device has successfully received its Link Partners' Link Code
Word.
MSGPG 13 - Message Page
This bit is used to differentiate a Message Page from an Unformatted Page. The
encodings are:
0b = Unformatted page.
1b = Message page.
ACK 14 - Acknowledge
The Link Partner has acknowledged Next Page reception.
NXTPG 15 - Next Page
Used to indicate whether or not this is the last Next Page to be transmitted. The
encodings are:
0b = Last page.
1b = Additional Next Pages follow.
Reserved 31:16 - Reserved