Altera Stratix V Avalon-MM Interface for PCIe Solutions User Manual Page 115
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Generation of Avalon-MM Interrupts
The generation of Avalon-MM interrupts requires the instantiation of the CRA slave module where the
interrupt registers and control logic are implemented. The CRA slave port has an Avalon-MM Interrupt
output signal, cra_Irq_irq. A write access to an Avalon-MM mailbox register sets one of the
P2A_MAILBOX_INT<n> bits in the Avalon-MM to PCI Express Interrupt Status Register and asserts
the cra_Irq_o or cra_Irq_irq output, if enabled. Software can enable the interrupt by writing to the
INT_X Interrupt Enable Register for Endpoints through the CRA slave. After servicing the
interrupt, software must clear the appropriate serviced interrupt status bit in the PCI-Express-to-
Avalon-MM Interrupt Status register and ensure that no other interrupt is pending.
Related Information
• Avalon-MM to PCI Express Interrupt Status Registers on page 5-15
• PCI Express to Avalon-MM Interrupt Status and Enable Registers for Endpoints on page 5-19
Interrupts for Endpoints Using the Avalon-MM Interface with Multiple
MSI/MSI‑X Support
If you select Enable multiple MSI/MSI X support under the Avalon-MM System Settings banner in the
parameter editor, the Hard IP for PCI Express exports the MSI, MSI-X, and INTx interfaces to the
Application Layer. The Application Layer must include a Custom Interrupt Handler to send interrupts to
the Root Port. You must design this Custom Interrupt Handler. The following figure provides an
overview of the logic for the Custom Interrupt Handler. The Custom Interrupt Handler should include
hardware to perform the following tasks:
• An MSI/MXI-X IRQ Avalon-MM Master port to drive MSI or MSI-X interrupts as memory writes to
the PCIe Avalon-MM bridge.
• A legacy interrupt signal, IntxReq_i, to drive legacy interrupts from the MSI/MSI-X IRQ module to
the Hard IP for PCI Express.
• An MSI/MSI-X Avalon-MM Slave port to receive interrupt control and status from the PCIe Root
Port.
• An MSI-X table to store the MSI-X table entries. The PCIe Root Port sets up this table.
UG-01097_avmm
2014.12.15
Generation of Avalon-MM Interrupts
7-3
Interrupts for Endpoints
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- User Guide 1
- Datasheet 2
- Features 3
- Interface 4
- Release Information 7
- Device Family Support 7
- Altera FPGA 8
- Debug Features 10
- IP Core Verification 10
- Recommended Speed Grades 11
- Running Qsys 14
- Generating the Example Design 15
- Simulating Altera Designs 17
- Time TLP Type Payload 18
- TLP Header 18
- Creating a Quartus II Project 19
- Compiling the Design 19
- Programming a Device 20
- Parameter Settings 21
- Parameter Value Description 22
- Device Capabilities 25
- Error Reporting 26
- Link Capabilities 27
- MSI and MSI-X Capabilities 28
- Power Management 29
- Clock Domains on page 6-5 33
- Application Layer 34
- RX Avalon-MM Master Signals 36
- Clock Signals 41
- Signal Direction Description 42
- Variant Logical Interfaces 49
- Hard IP Status Extension 50
- Field and Bit Map 58
- 0134678951 58
- Bit(s) Field Description 59
- Serial Data Signals 60
- PIPE Interface Signals 64
- Test Signals 69
- Registers 70
- Altera-Defined VSEC Registers 78
- CvP Registers 79
- Address Range Register 83
- Bit Name Access Description 84
- Bits Name Access Description 85
- PCI Express Mailbox Registers 86
- Avalon-MM Mailbox Registers 90
- Address Name Access 91
- Description 91
- Byte Offset 91
- Register Dir Description 91
- Sending a Write TLP 97
- Root Port TLP Data Registers 99
- UG-01097_avmm 100
- 2014.12.15 100
- Related Information 101
- Bits Register Description 102
- Reset and Clocks 105
- Hard IP for PCI Express 106
- Example Design 106
- Clock Domains 109
- Data Rate Frequency 110
- Clock Summary 112
- Interrupts for Endpoints 113
- MSI/MSI‑X Support 115
- MsiIntfc_o[81:0] 116
- MsiControl_o[15:0] 116
- MsixIntfc_o[15:0] 116
- IntxReq_i 116
- IntxAck_o 116
- Error Handling 117
- Physical Layer Errors 118
- Data Link Layer Errors 118
- Transaction Layer Errors 119
- Error Type Description 120
- Status Bit Conditions 123
- IP Core Architecture 125
- Hard IP for PCI Express 126
- Top-Level Interfaces 127
- Avalon-MM Interface 127
- Clocks and Reset 127
- Transceiver Reconfiguration 127
- Interrupts 127
- Data Link Layer 128
- Altera Corporation 129
- Send Feedback 129
- Physical Layer 130
- TX Packets 131
- Avalon‑MM Bridge TLPs 135
- Byte Enable Value Description 136
- PCI Express Avalon-MM Bridge 138
- RX Block 144
- Avalon-MM RX Master Block 144
- TX Block 145
- Interrupt Handler Block 145
- Enable PLL calibration 147
- Throughput Optimization 151
- Throughput of Posted Writes 153
- Design Implementation 155
- CONF_DONE 156
- Endpoint Reset 156
- Root Port Reset 156
- SDC Timing Constraints 157
- Optional Features 159
- ECRC on the RX Path 160
- ECRC on the TX Path 161
- Debugging 163
- Setting Up Simulation 166
- Use Third-Party PCIe Analyzer 168
- BIOS Enumeration Issues 168
- Address[31:2] 169
- Figure A-6: I/O Read Request 171
- 7 6 5 4 3 2 1 0 175
- Core Config 8 4 1 175
- Additional Information 177
- Date Version Changes Made 178
- How to Contact Altera 182
- Typographic Conventions 182
- Visual Cue Meaning 183
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