Msi and msi-x capabilities, Msi and msi-x capabilities -11 – Altera Arria 10 Avalon-MM User Manual
Page 37
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.
MSI and MSI-X Capabilities
Table 3-8: MSI and MSI-X Capabilities
Parameter
Value
Description
MSI messages
requested
1, 2, 4, 8, 16, 32
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
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
(1)
. 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.
Pending Bit
Array (PBA)
Offset
[31:0]
Used as an offset from the address contained in one of the
function’s Base Address registers to point to the base of the
MSI-X PBA. The lower 3 bits of the PBA BIR are set to zero by
software to form a 32-bit qword-aligned offset. This field is
read-only.
UG-01145_avmm
2015.05.14
MSI and MSI-X Capabilities
3-11
Parameter Settings
Altera Corporation