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Hardware Accessed Words — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 61
4.5.1.10 Initialization Control 3 (Word 14h, 24h)
This word controls general initialization values. Word 14h is used for LAN1. Word 24 is used for LAN0.
Table 9. EEPROM Sizing & Protected Fields (Word 12h)
Bit(s) Name Default Description
15:14 Signatur
e
01b The Signature field indicates to the device that there is a valid EEPROM present. If the
Signature field is not 01b, the other bits in this word are ignored, no further EEPROM read
is performed and default values are used for the configuration space IDs.
13:10 EEPROM
Size
0010b These bits indicate the actual EEPROM size and are mapped to EEC[14:11]:
0000b = 128 bytes
0001b = 256 bytes
0010b = 512 bytes
0011b = 1 KB
0100b = 2 KB
0101b = 4 KB
0110b = 8 KB
0111b = 16 KB
1000b = 32 KB
1001b - 1011b = Reserved
9:5 Reserved 00000b Reserved. Should be set to 00000b.
4 Enable
EEPROM
Protectio
n
0b If set, all EEPROM protection schemes are enabled.
3:0 HEPSize 0000b T0000 = No hidden block
0001b = 2 bytes
0010b = 4 bytes
0011b = 8 bytes
0100b = 16 bytes
0101b = 32 bytes
0110b = 64 bytes
0111b = 128 bytes
1000b = 256 bytes
1001b = 512 bytes
1010b = 1 KB
1011b = 2 KB
1100b = 4 KB
1101b = 8 KB
1110b -=16 KB
1111b = 32 KB