Intel 82559 用户手册

21

 

The Data Register is an 8-bit read-only register providing a mechanism for the device to report 

state dependent maximum power consumption and heat dissipation. The value reported in this 

register depends on the value written to the Data Select field in the PMCSR register.

The power measurements defined in the register have a dynamic range of 0 to 2.55 W with 0.01 W 
resolution according to the data scale. 

Note: The required accuracy should be in the range of +20% and -10%. The 82557 and 82558 do not 

implement this register. The 82559 and later Intel Fast Ethernet controllers do. The value reported 

in this register is hard-coded in the 82559 silicon. The structure of the data register is presented 
below:

NOTE: The D1 and D2 power states are not currently supported by operating systems.

The table below lists the PCI commands that the various Intel Fast Ethernet controllers can use.

0

2

D0 Power Consumption = 58 (580 mW)

1

2

D1 Power Consumption = 40 (400 mW)

2

2

D2 Power Consumption = 40 (400 mW)

3

2

D3 Power Consumption = 40 (400 mW)

4

2

D0 Power Dissipated = 58 (580 mW)

5

2

D1 Power Dissipated = 40 (400 mW)

6

2

D2 Power Dissipated = 40 (400 mW)

7

2

D3 Power Dissipated = 40 (400 mW)

8

2

Common Function Power Dissipated = 00

9-15

0

Reserved 00 h