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Next Page Transmit - PCS_NPTX (04220h; RO) — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 375
14.3.81 Next Page Transmit - PCS_NPTX (04220h; RO)
ACK 14 0b Acknowledge (SerDes)
The link partner has acknowledge page reception.
SGMII: Reserved.
LPNEXTP 15 0b LP Next Page Capable (SerDes)
The link partner asserts this bit to indicate its ability to accept next pages.
SGMII: Link-OK indication from the PHY.
Reserved 31:16 - Reserved
Field Bit(s)
Initial
Value
Description
CODE 10:0 0h 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 0b 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 0b Acknowledge 2
Used to indicate that a device has successfully received its Link Partners' Link Code
Word.
PGTYPE 13 0b Message/Unformatted Page
This bit is used to differentiate a Message Page from an Unformatted Page. The
encodings are:
0b = Unformatted page.
1b = Message page.
Reserved 14 - Reserved
NXTPG 15 0b 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
Field Bit(s)
Initial
Value
Description