Altera Stratix V Avalon-MM Interface for PCIe Solutions User Manual
Page 47
Interrupts for Endpoints when Multiple MSI/MSI‑X Support Is Enabled
Table 4-7: Exported Interrupt Signals for Endpoints when Multiple MSI/MSI‑X Support is Enabled
The following table describes the IP core’s exported interrupt signals when you turn on Enable multiple MSI/
MSI-X support under the Avalon-MM System Settings banner in the parameter editor.
Signal
Direction
Description
MsiIntfc_o[81:0]
Output
This bus provides the following MSI address, data, and enabled
signals:
•
MsiIntf_o[81]
: Master enable
•
MsiIntf_o[80
}: MSI enable
•
MsiIntf_o[79:64]
: MSI data
•
MsiIntf_o[63:0]
: MSI address
MsiControl_o[15:0]
Output
Provides for system software control of MSI as defined in Section
6.8.1.3 Message Control for MSI in the PCI Local Bus Specifica‐
tion, Rev. 3.0. The following fields are defined:
•
MsiControl_o[15:9]
: Reserved
•
MsiControl_o[8]
: Per-vector masking capable
•
MsiControl_o[7]
: 64-bit address capable
•
MsiControl_o[6:4]
: Multiple Message Enable
•
MsiControl_o[3:1]
: MSI Message Capable
•
MsiControl_o[0]
: MSI Enable.
MsixIntfc_o[15:0]
Output
Provides for system software control of MSI-X as defined in
Section 6.8.2.3 Message Control for MSI-X in the PCI Local Bus
Specification, Rev. 3.0. The following fields are defined:
•
MsixIntfc_o[15]
: Enable
•
MsixIntfc_o[14]
: Mask
•
MsixIntfc_o[13:11]
: Reserved
•
MsixIntfc_o[10:0]
: Table size
IntxReq_i
Input
When asserted, the Endpoint is requesting attention from the
interrupt service routine unless MSI or MSI-X interrupts are
enabled. Remains asserted until the device driver clears the
pending request.
4-14
Interrupts for Endpoints when Multiple MSI/MSI‑X Support Is Enabled
UG-01097_avmm
2014.12.15
Altera Corporation
64- or 128-Bit Avalon-MM Interface to the Application Layer