Altera Arria V Avalon-ST - Manual (Page 31)

Parameter Value Description
Slot clock
configuration
On/Off When On, indicates that the Endpoint or Root Port uses the
same physical reference clock that the system provides on the
connector. When Off, the IP core uses an independent clock
regardless of the presence of a reference clock on the
connector.
Slot Capabilities
Table 3-6: Slot Capabilities
Parameter Value Description
Use Slot register On/Off The slot capability is required for Root Ports if a slot is implemented
on the port. Slot status is recorded in the
PCI Express Capabili-
ties
register. This parameter is only supported in Root Port mode.
Defines the characteristics of the slot. You turn on this option by
selecting Enable slot capability. The various bits are defined as
follows:
31 19 18 17 16 15 14 7 6 5
Physical Slot Number
No Command Completed Support
Electromechanical Interlock Present
Slot Power Limit Scale
Slot Power Limit Value
Hot-Plug Capable
Hot-Plug Surprise
Power Indicator Present
Attention Indicator Present
MRL Sensor Present
Power Controller Present
Attention Button Present
0 4 3 2 1
Slot power scale 0–3 Specifies the scale used for the Slot power limit. The following
coefficients are defined:
• 0 = 1.0x
• 1 = 0.1x
• 2 = 0.01x
• 3 = 0.001x
The default value prior to hardware and firmware initialization is
b’00. Writes to this register also cause the port to send the
Set_
Slot_Power_Limit
Message.
Refer to Section 6.9 of the PCI Express Base Specification Revision for
more information.
Slot power limit 0–255 In combination with the Slot power scale value, specifies the upper
limit in watts on power supplied by the slot. Refer to Section 7.8.9 of
the PCI Express Base Specification for more information.
3-8 Slot Capabilities
2014.12.15
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