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106 Software Developer’s Manual
EEPROM Interface
5.6.8 Subsystem ID (Word 0Bh)
If the signature bits (15:14) and bit 1 (Load Subsystem IDs) of word 0Ah are valid, this word is
read in to initialize the Subsystem ID.
5.6.9 Subsystem Vendor ID (Word 0Ch)
If the signature bits (15:14) and bit 1 (Load Subsystem IDs) of word 0Ah are valid, this word is
read in to initialize the Subsystem Vendor ID.
7
Internal VREG Power
Down Control
82541xx and 82547GI/EI Only
This bit is used to define the usage of the internal 1.2 V dc and 1.8 V dc
regulators to supply power.
0b = Yes (default).
1b = No (external regulators used).
Note: Reserved bit for all other Ethernet controllers.
Bit Name Description
6:5 Reserved Reserved for future use. Set these bits to 0b.
4 Reserved Reserved for copper PHY. Set this bit to 0b.
3 Power Management
When set to 1b (default), enables full support for power management.
When set to 0b, the Power Management Registers set is read only. The
Ethernet controller does not execute a hardware transition to D3.
Note: Reserved bit for the 82541PI/GI/EI and 82547GI/EI (set to 1b).
Note: Reserved bit for the 82541ER (set to 0b).
2PME Clock
When set to 0b (default), indicates that the PCICLK is not required for
PME# output.
When set to 1b, indicates that the PCICLK is required for PME# output.
Note: Reserved bit for the 82541xx and 82547GI/EI (set to 0b).
1 Load Subsystem IDs
When set to 1b (default), indicates that the Ethernet controller is to load its
PCI Subsystem ID and Subsystem Vendor ID from the EEPROM (words
0Bh, 0Ch).
When set to 0b, indicates that the Ethernet controller is to load the default
PCI Subsystem ID and Subsystem Vendor ID.
0
Load Vendor/Device
IDs
When set to 0b (default), indicates that the Ethernet controller is to load the
default values for PCI Vendor and Device IDs.
When set to 1b (default for the 82541xx and 82547GI/EI only), indicates
that the Ethernet controller is to load its PCI Vendor and Device IDs from
the EEPROM (words 0Dh, 0Eh).
a. Not applicable to the 82541xx, 82547GI/EI or 82540EP/EM.
Table 5-5. Initialization Control Word 1 (Word 0Ah)