Altera V-Series Avalon-MM DMA - Manual (Page 29)

Link Capabilities
Table 3-6: Link Capabilities
Parameter Value Description
Link port
number
0x01 Sets the read-only value of the port number field in the
Link
Capabilities
register.
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.
MSI and MSI-X Capabilities
Table 3-7: MSI and MSI-X Capabilities
Parameter Value Description
MSI messages
requested
1, 2, 4, 8, 16 Specifies the number of messages the Application Layer can
request. Sets the value of the
Multiple Message Capable
field of the
Message Control
register, 0x050[31:16].
MSI-X Capabilities
Implement MSI-X On/Off When On, enables the MSI-X functionality.
Bit Range
Table size [10:0] System software reads this field to determine the MSI-X Table
size , which is encoded as . For example, a returned
value of 2047 indicates a table size of 2048. This field is read-
only. Legal range is 0–2047 (2 11 ).
Address offset: 0x068[26:16]
Table Offset [31:0] Points to the base of the MSI-X Table. The lower 3 bits of the
table BAR indicator (BIR) are set to zero by software to form a
32-bit qword-aligned offset. This field is read-only.
Table BAR
Indicator
[2:0] Specifies which one of a function’s BARs, located beginning at
0x10 in Configuration Space, is used to map the MSI-X table
into memory space. This field is read-only. Legal range is 0–5.
3-8 Link Capabilities
UG-01154
2014.12.18
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