Altera Stratix V Avalon-MM Interface for PCIe Solutions User Manual Page 113
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Interrupts for Endpoints
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2014.12.15
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The PCI Express Avalon-MM bridge supports MSI or legacy interrupts. The completer only single dword
variant includes an interrupt handler that implements both INTX and MSI interrupts. Support requires
instantiation of the CRA slave module where the interrupt registers and control logic are implemented.
The PCI Express Avalon-MM bridge supports the Avalon-MM individual requests interrupt scheme:
multiple input signals indicate incoming interrupt requests, and software must determine priorities for
servicing simultaneous interrupts.
The RX master module port has up to 16 Avalon-MM interrupt input signals (RXmirq_irq[ <n> :0],
where <n> ≤15). Each interrupt signal indicates a distinct interrupt source. Assertion of any of these
signals, or a PCI Express mailbox register write access, sets a bit in the Avalon-MM to PCI Express
Interrupt Status register. Multiple bits can be set at the same time; Application Layer software on the
host side determines priorities for servicing simultaneous incoming interrupt requests. Each set bit in the
Avalon-MM to PCI Express Interrupt Status register generates a PCI Express interrupt, if enabled,
when software determines its turn. Software can enable the individual interrupts by writing to the
Avalon-MM to PCI Express Interrupt Enable Register through the CRA slave.
When any interrupt input signal is asserted, the corresponding bit is written in the Avalon-MM to PCI
Express Interrupt Status Register. Software reads this register and decides priority on servicing
requested interrupts.
After servicing the interrupt, software must clear the appropriate serviced interrupt status bit and ensure
that no other interrupts are pending. For interrupts caused by Avalon-MM to PCI Express Interrupt
Status Register mailbox writes, the status bits should be cleared in the Avalon-MM to PCI Express
Interrupt Status Register. For interrupts due to the incoming interrupt signals on the Avalon-MM
interface, the interrupt status should be cleared in the Avalon-MM component that sourced the interrupt.
This sequence prevents interrupt requests from being lost during interrupt servicing.
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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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