L- and H-Tile Avalon® Streaming and Single Root I/O Virtualization (SR-IOV) Intel® FPGA IP for PCI Express* User Guide
ID
683111
Date
9/12/2024
Public
1. Introduction
2. Quick Start Guide
3. Interface Overview
4. Parameters
5. Designing with the IP Core
6. Block Descriptions
7. Interrupts
8. Registers
9. Testbench and Design Example
10. Document Revision History
A. PCI Express Core Architecture
B. TX Credit Adjustment Sample Code
C. Root Port Enumeration
D. Troubleshooting and Observing the Link Status
1.1. Avalon-ST Interface with Optional SR-IOV for PCIe Introduction
1.2. Features
1.3. Release Information
1.4. Device Family Support
1.5. Recommended Fabric Speed Grades
1.6. Performance and Resource Utilization
1.7. Transceiver Tiles
1.8. PCI Express IP Core Package Layout
1.9. Channel Availability
2.1. Design Components
2.2. Hardware and Software Requirements
2.3. Directory Structure
2.4. Generating the Design Example
2.5. Simulating the Design Example
2.6. Compiling the Design Example and Programming the Device
2.7. Installing the Linux Kernel Driver
2.8. Running the Design Example Application
3.1. Avalon-ST RX Interface
3.2. Avalon-ST TX Interface
3.3. TX Credit Interface
3.4. TX and RX Serial Data
3.5. Clocks
3.6. Function-Level Reset (FLR) Interface
3.7. Control Shadow Interface for SR-IOV
3.8. Configuration Extension Bus Interface
3.9. Hard IP Reconfiguration Interface
3.10. Interrupt Interfaces
3.11. Power Management Interface
3.12. Reset
3.13. Transaction Layer Configuration Interface
3.14. PLL Reconfiguration Interface
3.15. PIPE Interface (Simulation Only)
4.1. Stratix 10 Avalon-ST Settings
4.2. Multifunction and SR-IOV System Settings
4.3. Base Address Registers
4.4. Device Identification Registers
4.5. TPH/ATS Capabilities
4.6. PCI Express and PCI Capabilities Parameters
4.7. Configuration, Debug and Extension Options
4.8. PHY Characteristics
4.9. Example Designs
6.1.1. TLP Header and Data Alignment for the Avalon-ST RX and TX Interfaces
6.1.2. Avalon-ST 256-Bit RX Interface
6.1.3. Avalon-ST 512-Bit RX Interface
6.1.4. Avalon-ST 256-Bit TX Interface
6.1.5. Avalon-ST 512-Bit TX Interface
6.1.6. TX Credit Interface
6.1.7. Interpreting the TX Credit Interface
6.1.8. Clocks
6.1.9. Update Flow Control Timer and Credit Release
6.1.10. Function-Level Reset (FLR) Interface
6.1.11. Resets
6.1.12. Interrupts
6.1.13. Control Shadow Interface for SR-IOV
6.1.14. Transaction Layer Configuration Space Interface
6.1.15. Configuration Extension Bus Interface
6.1.16. Hard IP Status Interface
6.1.17. Hard IP Reconfiguration
6.1.18. Power Management Interface
6.1.19. Serial Data Interface
6.1.20. PIPE Interface
6.1.21. Test Interface
6.1.22. PLL IP Reconfiguration
6.1.23. Message Handling
8.1.1. Register Access Definitions
8.1.2. PCI Configuration Header Registers
8.1.3. PCI Express Capability Structures
8.1.4. Intel Defined VSEC Capability Header
8.1.5. General Purpose Control and Status Register
8.1.6. Uncorrectable Internal Error Status Register
8.1.7. Uncorrectable Internal Error Mask Register
8.1.8. Correctable Internal Error Status Register
8.1.9. Correctable Internal Error Mask Register
8.1.10. SR-IOV Virtualization Extended Capabilities Registers Address Map
8.1.10.1. ARI Enhanced Capability Header
8.1.10.2. SR-IOV Enhanced Capability Registers
8.1.10.3. Initial VFs and Total VFs Registers
8.1.10.4. VF Device ID Register
8.1.10.5. Page Size Registers
8.1.10.6. VF Base Address Registers (BARs) 0-5
8.1.10.7. Secondary PCI Express Extended Capability Header
8.1.10.8. Lane Status Registers
8.1.10.9. Transaction Processing Hints (TPH) Requester Enhanced Capability Header
8.1.10.10. TPH Requester Capability Register
8.1.10.11. TPH Requester Control Register
8.1.10.12. Address Translation Services ATS Enhanced Capability Header
8.1.10.13. ATS Capability Register and ATS Control Register
9.4.1. ebfm_barwr Procedure
9.4.2. ebfm_barwr_imm Procedure
9.4.3. ebfm_barrd_wait Procedure
9.4.4. ebfm_barrd_nowt Procedure
9.4.5. ebfm_cfgwr_imm_wait Procedure
9.4.6. ebfm_cfgwr_imm_nowt Procedure
9.4.7. ebfm_cfgrd_wait Procedure
9.4.8. ebfm_cfgrd_nowt Procedure
9.4.9. BFM Configuration Procedures
9.4.10. BFM Shared Memory Access Procedures
9.4.11. BFM Log and Message Procedures
9.4.12. Verilog HDL Formatting Functions
6.5. RX Buffer
The Receive Buffer stores TLPs received from the PCI Express link. The RX Buffer stores the entire TLP before it forwards it to the Application Layer.
Storing the entire TLP allows the IP to accomplish two things:
- The IP core can rate match the PCIe link to the Application Layer.
- The IP core can store TLPs until error checking is complete.
The 64 KB RX buffer has separate buffer space for Posted, Non-Posted and Completion TLPS. Headers and data also have separate allocations. The RX Buffer enables full bandwidth RX traffic for all three types of TLPs simultaneously.
RX Buffer Segment | Number of Credits | Buffer Size |
---|---|---|
Posted | Posted headers: 127 credits Posted data: 750 credits |
~14 KB |
Non-posted | Non-posted headers credits: 115 credits Non-posted data credits: 230 credits |
~5.5 KB |
Completions | Completion headers: 770 credits Completion data: 2500 credits |
~50 KB |
The RX buffer operates only in the Store and Forward Queue Mode. Bypass and Cut-through modes are not supported.
Flow control credit checking for the posted and non-posted buffer segments prevents RX buffer overflow. The PCI Express Base Specification Revision 3.0 requires the IP core to advertise infinite Completion credits. The Application Layer must manage the Read Requests so as not to overflow the Completion buffer segment.
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