Intel PCI-X manual Checksum Word Calculation Word 3Fh, Eeprom Images, State Bit Resulting Word

EEPROM Interface

5.6.35Checksum Word Calculation (Word 3Fh)

The Checksum word (3Fh) should be calculated such that after adding all the words (00h-3Fh), including the Checksum word itself, the sum should be BABAh. The initial value in the 16-bit summing register should be 0000h and the carry bit should be ignored after each addition. This checksum is not accessed by the Ethernet controller. If CRC checking is required, it must be performed by software.

Note: Hardware does not calculate checksum word 3Fh during EEPROM write; it must be calculated by software independently and included in the EEPROM write data. Hardware does not compute a checksum over words 00h-0Fh during EEPROM reads in order to determine the validity of the EEPROM image; this field is provided strictly for software verification of EEPROM validity. All hardware configuration based on word 00h-0Fh content is based on the validity of the Signature field of EEPROM Initialization Control Word 1. Signature must be 01b.

5.6.3682546GB/EB Dual-Channel Fiber Wake on LAN (WOL) Mode and Functionality (Word 0Ah, 20h)

Four bits and two words determine dual-channel fiber WOL mode and functionality. In addition to the power management bits, one of the SDP’s must be set in order for the “A” laser to remain on when the system goes into D3. Three states are defined for the EEPROM image:

•Never - The Ethernet controller has WOL disabled and cannot be put into WOL mode.

•Possible - The Ethernet controller can be WOL enabled, but currently has the feature turned off. This is the normal shipping configuration for WOL-capable server adapter cards.

•On - The Ethernet controller is set with WOL functionality enabled.

Table 5-19. WOL Mode and Functionality (Word 0Ah)

State		Bit 2	Bit 7	Resulting Word
Never	0		0	4C03
Possible	1		0	4C0B
On	1		1	4C2B

Table 5-20. WOL Mode and Functionality (Word 20h)

State		Bit 2	Bit 7	Resulting Word
Never	0		0	C109
Possible	1		0	C10D
On	1		1	C18D

5.6.37EEPROM Images

Refer to the appropriate Ethernet controller’s EEPROM map and programming information for sample EEPROM images.

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