Altera Arria 10 Avalon-ST Manual do Utilizador Página 121

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Signal Direction Description
pm_event
Input Power Management Event. This signal is only available for
Endpoints.
The Endpoint initiates a a power_management_event message
(PM_PME) that is sent to the Root Port. If the Hard IP is in a low
power state, the link exits from the low-power state to send the
message. This signal is positive edge-sensitive.
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 6-41: Layout of Power Management Capabilities Register
data_selectdata_scale PM_statePME_ENPME_status reserved
15 011623 8 2791213142431
reserved
data
register
UG-01145_avst
2015.05.04
Power Management Signals
6-55
Interfaces and Signal Descriptions
Altera Corporation
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