
Signal Direction Description
pm_data[9:0]
Input Power Management Data.
This bus indicates power consumption of the component. This
bus can only be implemented if all three bits of AUX_power (part
of the Power Management Capabilities structure) are set to 0.
This bus includes the following bits:
• pm_data[9:2]: Data Register: This register maintains a value
associated with the power consumed by the component.
(Refer to the example below)
• pm_data[1:0]: Data Scale: This register maintains the scale
used to find the power consumed by a particular component
and can include the following values:
• 2b’00: unknown
• 2b’01: 0.1 ×
• 2b’10: 0.01 ×
• 2b’11: 0.001 ×
For example, the two registers might have the following values:
• pm_data[9:2]: b’1110010 = 114
• pm_data[1:0]: b’10, which encodes a factor of 0.01
To find the maximum power consumed by this component,
multiply the data value by the data Scale (114 × .01 = 1.14). 1.14
watts is the maximum power allocated to this component in the
power state selected by the data_select field.
pm_auxpwr
Input Power Management Auxiliary Power: This signal can be tied to 0
because the L2 power state is not supported.
Figure 4-33: Layout of Power Management Capabilities Register
data_selectdata_scale PM_statePME_ENPME_status reserved
15 011623 8 2791213142431
reserved
data
register
Table 4-18: Power Management Capabilities Register Field Descriptions
Bits Field Description
[31:24]
Data register
This field indicates in which power states a function can assert
the PME# message.
[23:16]
reserved
—
4-46
Power Management Signals
2014.12.15
Altera Corporation
Interfaces and Signal Descriptions
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