Interrupt interface – Altera Stratix V Avalon-ST User Manual
Page 49
Table 4-7: Function-Level Reset Interface
Signal
Direction
Description
flr_active_pf[<n>-
1:0]
Output
When asserted, indicates the PF FLR field (bit 15) of the Device
Control Register is set. When asserted, a PF is being reset. (Bit 0
is for PF0. Bit 1 is for PF1).
The Application Layer must monitor
flr_active_pf[<n>-1:0]
and clear any pending transactions associated with the function
being reset. The Application Layer must then assert
flr_
completed_pf
.
flr_completed_pf[<n>-
1:0]
Input
When asserted for one or more cycles, indicates that the Applica‐
tion Layer has completed resetting all the logic associated with
the PF. (Bit 0 is for PF0. Bit 1 is for PF1). When
flr_active_pf
is asserted, the Application Layer must assert
flr_completed
within 100 microseconds to re-enable the function.
flr_active_vf[<n>-
1:0]
Output
Asserting bit <n> indicates a 1 was written into the FLR field (bit
15) of the Device Control Register for VF<n>. When asserted,
indicates that VF <n> is being reset. Multiple VFs can be reset
simultaneously. Consequently, the Application Layer must
monitor each bit of this output port in parallel.
The Application Layer must clear any pending transactions
associated with the VF being reset. It must then assert the
corresponding bit of
flr_completed
to signal to indicate it is
ready to re-enable the VF.
<n> is the total number of VFs.
flr_completed_vf[<n>-
1:0]
Input
Asserting bit <n> for one or more cycles indicates that the
Application Layer has completed resetting all the logic associated
with VF <n>.
When
flr_active_vf<n>
is asserted, the Application Layer it
must assert the corresponding bit of
flr_completed
within 100
microseconds to re-enable the VF.
<n> is the total number of VFs.
Related Information
on page 6-5
Interrupt Interface
The SR-IOV Bridge supports MSI and MSI-X interrupts for both Physical and Virtual Functions. It also
supports legacy Interrupts for Physical Functions. The Application Layer can use this interface to generate
MSI or MSI-X interrupts from both PFs and VFs. The Application Layer can generate legacy interrupts
from PFs only. The Application Layer should select one of the three types of interrupts, depending on the
support provided by the platform and the software drivers. Ground the input pins for the unused
interrupt types.
4-14
Interrupt Interface
UG-01097_sriov
2014.12.15
Altera Corporation
Interfaces and Signal Descriptions