R-tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide

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ID 683501
Date 6/20/2022
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Document Table of Contents
Document Table of Contents x
1. About the R-tile Avalon® Streaming Intel® FPGA IP for PCI Express 2. IP Architecture and Functional Description 3. Advanced Features 4. Interfaces 5. Parameters 6. Troubleshooting/Debugging 7. R-Tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide Archives 8. Document Revision History for the R-tile Avalon® Streaming Intel FPGA IP for PCI Express User Guide A. Configuration Space Registers B. Root Port Enumeration C. Implementation of Address Translation Services (ATS) in Endpoint Mode D. Packets Forwarded to the User Application in TLP Bypass Mode
1. About the R-tile Avalon® Streaming Intel® FPGA IP for PCI Express x
1.1. Overview 1.2. Features 1.3. Release Information 1.4. Device Family Support 1.5. Performance and Resource Utilization 1.6. IP Core Support Levels
1.1. Overview x
1.1.1. Standards and Specifications Compliance
1.2. Features x
1.2.1. Multifunction and Virtualization Features
2. IP Architecture and Functional Description x
2.1. Overview 2.2. Bias Temperature Instability (BTI) Protection Mode 2.3. PCIe Hard IP Mode 2.4. PIPE Direct Mode
2.3. PCIe Hard IP Mode x
2.3.1. Clocking 2.3.2. Reset 2.3.3. PCI Express Protocol Stack
2.3.2. Reset x
2.3.2.1. Single PERST 2.3.2.2. Independent PERST
2.3.2.2. Independent PERST x
2.3.2.2.1. REFCLK and PERST Guidelines when Using Independent PERST
2.3.3. PCI Express Protocol Stack x
2.3.3.1. PMA/PCS 2.3.3.2. Data Link Layer Overview 2.3.3.3. Transaction Layer Overview
2.3.3.3. Transaction Layer Overview x
2.3.3.3.1. Deferrable Memory Write (DMWr)
2.4. PIPE Direct Mode x
2.4.1. Clocking 2.4.2. Reset 2.4.3. PIPE Layer
3. Advanced Features x
3.1. PCIe Port Bifurcation and PHY Channel Mapping 3.2. Virtualization Support 3.3. TLP Bypass Mode
3.2. Virtualization Support x
3.2.1. SR-IOV Support 3.2.2. VirtIO Support
3.2.1. SR-IOV Support x
3.2.1.1. SR-IOV Supported Features List 3.2.1.2. Implementation 3.2.1.3. VF to PF Mapping 3.2.1.4. Function Level Reset (FLR)
3.2.1.2. Implementation x
3.2.1.2.1. VF Error Flag Interface (for x16/x8 Cores Only)
3.2.2. VirtIO Support x
3.2.2.1. VirtIO Supported Features List 3.2.2.2. Overview 3.2.2.3. Parameters 3.2.2.4. VirtIO PCI Configuration Access Interface 3.2.2.5. Registers
3.2.2.5. Registers x
3.2.2.5.1. VirtIO Common Configuration Capability Register (Address: 0x012) 3.2.2.5.2. VirtIO Common Configuration BAR Indicator Register (Address: 0x013) 3.2.2.5.3. VirtIO Common Configuration BAR Offset Register (Address: 0x014) 3.2.2.5.4. VirtIO Common Configuration Structure Length Register (Address 0x015) 3.2.2.5.5. VirtIO Notifications Capability Register (Address: 0x016) 3.2.2.5.6. VirtIO Notifications BAR Indicator Register (Address: 0x017) 3.2.2.5.7. VirtIO Notifications BAR Offset Register (Address: 0x018) 3.2.2.5.8. VirtIO Notifications Structure Length Register (Address: 0x019) 3.2.2.5.9. VirtIO Notifications Notify Off Multiplier Register (Address: 0x01A) 3.2.2.5.10. VirtIO ISR Status Capability Register (Address: 0x02F) 3.2.2.5.11. VirtIO ISR Status BAR Indicator Register (Address: 0x030) 3.2.2.5.12. VirtIO ISR Status BAR Offset Register (Address: 0x031) 3.2.2.5.13. VirtIO ISR Status Structure Length Register (Address: 0x032) 3.2.2.5.14. VirtIO Device Specific Capability Register (Address: 0x033) 3.2.2.5.15. VirtIO Device Specific BAR Indicator Register (Address: 0x034) 3.2.2.5.16. VirtIO Device Specific BAR Offset Register (Address 0x035) 3.2.2.5.17. VirtIO Device Specific Structure Length Register (Address: 0x036) 3.2.2.5.18. VirtIO PCI Configuration Access Capability Register (Address: 0x037) 3.2.2.5.19. VirtIO PCI Configuration Access BAR Indicator Register (Address: 0x038) 3.2.2.5.20. VirtIO PCI Configuration Access BAR Offset Register (Address: 0x039) 3.2.2.5.21. VirtIO PCI Configuration Access Structure Length Register (Address: 0x03A) 3.2.2.5.22. VirtIO PCI Configuration Access Data Register (Address: 0x03B)
3.3. TLP Bypass Mode x
3.3.1. Overview 3.3.2. Register Settings for the TLP Bypass Mode 3.3.3. Hard IP Reconfiguration Interface 3.3.4. Avalon® Streaming Interface
3.3.2. Register Settings for the TLP Bypass Mode x
3.3.2.1. TLPBYPASS_ERR_EN (Address 0x1314) 3.3.2.2. TLPBYPASS_ERR_STATUS (Address 0x1310)
3.3.4. Avalon® Streaming Interface x
3.3.4.1. Configuration TLP 3.3.4.2. Transmit Interface 3.3.4.3. Receive Interface 3.3.4.4. Malformed TLP 3.3.4.5. ECRC
4. Interfaces x
4.1. Clocks and Resets 4.2. Serial Data Interface 4.3. PCI Express Mode 4.4. PIPE Direct Mode
4.1. Clocks and Resets x
4.1.1. Clocks 4.1.2. Resets
4.3. PCI Express Mode x
4.3.1. Avalon® Streaming Interface 4.3.2. Precision Time Measurement (PTM) Interface (Endpoint Only) 4.3.3. Interrupt Interface 4.3.4. Hard IP Reconfiguration Interface 4.3.5. Error Interface 4.3.6. Completion Timeout Interface 4.3.7. Configuration Intercept Interface 4.3.8. Power Management Interface 4.3.9. Hard IP Status Interface 4.3.10. Page Request Services (PRS) Interface (Endpoint Only) 4.3.11. Function-Level Reset (FLR) Interface (Endpoint Only) 4.3.12. SR-IOV VF Error Flag Interface (Endpoint Only) 4.3.13. General Purpose VSEC Interface
4.3.1. Avalon® Streaming Interface x
4.3.1.1. TLP Header and Data Alignment for the Avalon® streaming RX and TX Interfaces 4.3.1.2. Credit Control 4.3.1.3. Avalon® Streaming RX Interface 4.3.1.4. Avalon® Streaming TX Interface 4.3.1.5. Tag Allocation
4.3.1.2. Credit Control x
4.3.1.2.1. Credit Interface - Data and Header 4.3.1.2.2. Credit Initialization 4.3.1.2.3. Credit Update/Release 4.3.1.2.4. RX Flow Control Interface 4.3.1.2.5. TX Flow Control Interface
4.3.1.4. Avalon® Streaming TX Interface x
4.3.1.4.1. Avalon® Streaming TX Interface tx_st_ready_o Behavior
4.3.1.5. Tag Allocation x
4.3.1.5.1. Completion Buffer Size
4.3.3. Interrupt Interface x
4.3.3.1. Legacy Interrupts 4.3.3.2. MSI 4.3.3.3. MSI-X
4.3.3.3. MSI-X x
4.3.3.3.1. Implementing MSI-X Interrupts
4.3.8. Power Management Interface x
4.3.8.1. D3Hot Entry 4.3.8.2. D3Hot Exit 4.3.8.3. D3Cold Entry 4.3.8.4. D3Cold Exit
4.3.8.2. D3Hot Exit x
4.3.8.2.1. D3Hot Exit Initiated by Host 4.3.8.2.2. D3Hot Exit Initiated by EP
4.4. PIPE Direct Mode x
4.4.1. Data Signals 4.4.2. Command and Status Signals 4.4.3. Message Bus Signals 4.4.4. Deskew Signals 4.4.5. PIPE Direct Reset Sequence 4.4.6. PIPE Direct Speed Change 4.4.7. PIPE Lane Reset Staggering 4.4.8. Unused Lanes in PIPE Direct Mode
4.4.1. Data Signals x
4.4.1.1. Transmit Signals 4.4.1.2. Receive Signals
4.4.4. Deskew Signals x
4.4.4.1. MAC to PHY (M2P) Signals 4.4.4.2. PHY to MAC (P2M) Signals
5. Parameters x
5.1. Top-Level Settings 5.2. Core Parameters
5.2. Core Parameters x
5.2.1. Avalon Parameters 5.2.2. Base Address Registers 5.2.3. PCI Express and PCI Capabilities Parameters
5.2.3. PCI Express and PCI Capabilities Parameters x
5.2.3.1. Device Capabilities 5.2.3.2. VirtIO Parameters 5.2.3.3. Link Capabilities 5.2.3.4. Legacy Interrupt Pin Register 5.2.3.5. MSI Capabilities 5.2.3.6. MSI-X Capabilities 5.2.3.7. Slot Capabilities 5.2.3.8. Latency Tolerance Reporting (LTR) 5.2.3.9. Process Address Space ID (PASID) 5.2.3.10. Device Serial Number Capability 5.2.3.11. Page Request Service (PRS) 5.2.3.12. Access Control Service (ACS) 5.2.3.13. Power Management 5.2.3.14. Vendor Specific Extended Capability (VSEC) Registers 5.2.3.15. TLP Processing Hints (TPH) 5.2.3.16. Address Translation Services (ATS) Capabilities 5.2.3.17. Precision Time Management (PTM)
6. Troubleshooting/Debugging x
6.1. Using the Hard IP Reconfiguration Interface for Debugging 6.2. Debug Toolkit
6.1. Using the Hard IP Reconfiguration Interface for Debugging x
6.1.1. Using the Hard IP Reconfiguration Interface to Enable and Read ECRC and LCRC Error Counts
6.2. Debug Toolkit x
6.2.1. Overview 6.2.2. Enabling the R-Tile Debug Toolkit 6.2.3. Launching the R-tile Debug Toolkit 6.2.4. Using the R-Tile Debug Toolkit
6.2.4. Using the R-Tile Debug Toolkit x
6.2.4.1. R-Tile Information 6.2.4.2. Event Counters 6.2.4.3. Configuration Space
C. Implementation of Address Translation Services (ATS) in Endpoint Mode x
C.1. Sending Translated/Untranslated Requests C.2. Sending a Page Request Message from the Endpoint (EP) to the Root Complex (RC) C.3. Invalidating Requests/Completions
D. Packets Forwarded to the User Application in TLP Bypass Mode x
D.1. EP TLP Bypass Mode (Upstream) D.2. RC TLP Bypass Mode (Downstream)
1. About the R-tile Avalon® Streaming Intel® FPGA IP for PCI Express
2. IP Architecture and Functional Description
3. Advanced Features
4. Interfaces
5. Parameters
6. Troubleshooting/Debugging
7. R-Tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide Archives
8. Document Revision History for the R-tile Avalon® Streaming Intel FPGA IP for PCI Express User Guide
A. Configuration Space Registers
B. Root Port Enumeration
C. Implementation of Address Translation Services (ATS) in Endpoint Mode
D. Packets Forwarded to the User Application in TLP Bypass Mode

4.3.1. Avalon® Streaming Interface

Each of the PCIe cores has its own Avalon® streaming interface to the user logic in the FPGA fabric. The number of IP-to-User Logic interfaces exposed to the FPGA fabric are different based on the topologies:
Table 48.  IP to FPGA Fabric Interfaces Summary
Topology Avalon-ST Interface Count Data Width (each Interface) Header Width (each Interface) TLP Prefix Width (each Interface) Application Clock Frequency Note
Gen5 1x16 EP/RP/BP 1 1024-bit (four 256-bit segments) 512-bit (four 128-bit segments) 128-bit (four 32-bit segments)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz

  
Gen4 1x16 EP/RP/BP 1 1024-bit (four 256-bit segments) 512-bit (four 128-bit segments) 128-bit (four 32-bit segments)

250 MHz / 275 MHz / 300 MHz

  
512-bit (two 256-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz
Gen3 1x16 EP/RP/BP 1 1024-bit (four 256-bit segments) 512-bit (four 128-bit segments) 128-bit (four 32-bit segments)

250 MHz / 275 MHz / 300 MHz

  
512-bit (two 256-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz

 3
Gen5 2x8 EP/RP/BP 2 512-bit (two 256-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz

  
Gen4 2x8 EP/RP/BP 2 512-bit (two 256-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

250 MHz / 275 MHz / 300 MHz

  
256-bit (one 256-bit segment) 128-bit (one 128-bit segment) 32-bit (one 32-bit segment)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz

 3
Gen3 2x8 EP/RP/BP 2 512-bit (two 256-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

250 MHz / 275 MHz / 300 MHz

  
256-bit (one 256-bit segment) 128-bit (one 128-bit segment) 32-bit (one 32-bit segment)

250 MHz / 275 MHz / 300 MHz

 3
Gen5 4x4 EP/RP/BP 4 256-bit (two 128-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz

  
Gen4 4x4 EP/RP/BP 4 256-bit (two 128-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz

  
128-bit (one 128-bit segment) 128-bit (one 128-bit segment) 32-bit (one 32-bit segment)

400 MHz / 425 MHz / 450 MHz / 475 MHz / 500 MHz

 3
Gen3 4x4 EP/RP/BP 4 256-bit (two 128-bit segments) 256-bit (two 128-bit segments) 64-bit (two 32-bit segments)

250 MHz / 275 MHz / 300 MHz

  
128-bit (one 128-bit segment) 128-bit (one 128-bit segment) 32-bit (one 32-bit segment)

250 MHz / 275 MHz / 300 MHz

 3

The R-tile PCIe Hard IP provides an Avalon® Streaming-like interface with separate header and data to improve the bandwidth utilization.

The Avalon® Streaming interface has different data bus widths depending on the link width configuration of the PCIe IP.

Table 49.   Avalon® Streaming Interface Data and Header Bus Widths per Port
Link Width Link Speed Data Width (Bits) Header Width (Bits) TLP Prefix Width (Bits) Note
x16 Gen5 1024 (4 x 256) 512 (4 x 128) 128 (4 x 32)  
Gen4 1024 (4 x 256) 512 (4 x 128) 128 (4 x 32)  
512 (2 x 256) 256 (2 x 128) 64 (2 x 32)
Gen3 1024 (4 x 256) 512 (4 x 128) 128 (4 x 32)  
512 (2 x 256) 256 (2 x 128) 64 (2 x 32) 4
x8 Gen5 512 (2 x 256) 256 (2 x 128) 64 (2 x 32)  
Gen4 512 (2 x 256) 256 (2 x 128) 64 (2 x 32)  
256 (1 x 256) 128 (1 x 128) 32 (1 x 32) 4
Gen3 512 (2 x 256) 256 (2 x 128) 64 (2 x 32)  
256 (1 x 256) 128 (1 x 128) 32 (1 x 32) 4
x4 Gen5 256 (2 x 128) 256 (2 x 128) 64 (2 x 32)  
Gen4 256 (2 x 128) 256 (2 x 128) 64 (2 x 32)  
128 (1 x 128) 128 (1 x 128) 32 (1 x 32) 4
Gen3 256 (2 x 128) 256 (2 x 128) 64 (2 x 32)  
128 (1 x 128) 128 (1 x 128) 32 (1 x 32) 4

Section Content
TLP Header and Data Alignment for the Avalon streaming RX and TX Interfaces
Credit Control
Avalon Streaming RX Interface
Avalon Streaming TX Interface
Tag Allocation

3 This topology is only available in devices with the suffix R2 or R3 in their OPN number. For more details on OPN decoding, refer to the Intel® Agilex™ FPGAs and SoCs Device Overview.
4 This topology is only available in devices with the suffix R2 or R3 in their OPN number. For more details on OPN decoding, refer to the Intel® Agilex™ FPGAs and SoCs Device Overview.
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