4–10
Chapter 4: Parameter Settings
Slot Capabilities
Arria V GZ Hard IP for PCI Express
November 2012
Altera Corporation
Slot Capabilities
lists the Slot Capabilities parameter registers.
ss
Table 4–10. Slot Capabilities
Parameter
Value
Description
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
Capabilities
Register
. This parameter is
only supported for the Arria V GZ Hard IP for PCI Express in Root Port mode.
Slot capability
register
—
Defines the characteristics of the slot. You turn on this option by selecting
Enable
slot capability
. The various bits are defined as follows:
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 2.1
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.
Slot number
0-8191
Specifies the slot number.
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