F-Tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide

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ID 683140
Date 4/07/2025
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Document Table of Contents
Document Table of Contents x
1. Acronyms 2. Introduction 3. IP Architecture and Functional Description 4. Advanced Features 5. Interfaces 6. Parameters 7. Testbench 8. Troubleshooting/Debugging 9. F-Tile Avalon Streaming Intel FPGA IP for PCI Express User Guide Archives 10. Revision History for the F-Tile Avalon Streaming Intel FPGA IP for PCI Express User Guide A. Configuration Space Registers B. Implementation of Address Translation Services (ATS) in Endpoint Mode C. Packets Forwarded to the User Application in TLP Bypass Mode D. Root Port Enumeration E. Bifurcated Endpoint Support for Independent Resets
2. Introduction x
2.1. Overview 2.2. Features 2.3. Release Information 2.4. Device Family Support 2.5. Performance and Resource Utilization 2.6. IP Core and Design Example Support Levels
3. IP Architecture and Functional Description x
3.1. Architecture 3.2. Functional Description 3.3. Avalon-ST TX/RX 3.4. Interrupts 3.5. Completion Timeout 3.6. Hot Plug 3.7. Power Management 3.8. Configuration Output Interface (COI) 3.9. Configuration Intercept Interface (EP Only) 3.10. Hard IP Reconfiguration Interface 3.11. PHY Reconfiguration Interface 3.12. Page Request Service (PRS) (EP Only)
3.1. Architecture x
3.1.1. Clocks 3.1.2. Refclk 3.1.3. Reset
3.1.2. Refclk x
3.1.2.1. Guidelines for System PLL Reference Clock 3.1.2.2. Guidelines for FGT Reference Clock
3.2. Functional Description x
3.2.1. PMA/PCS 3.2.2. Data Link Layer 3.2.3. Transaction Layer
3.3. Avalon-ST TX/RX x
3.3.1. TLP Header and Data Alignment 3.3.2. Avalon-ST RX 3.3.3. Avalon-ST TX 3.3.4. Tag Allocation 3.3.5. Completion Buffer Size
3.3.2. Avalon-ST RX x
3.3.2.1. RX Flow Control
3.3.3. Avalon-ST TX x
3.3.3.1. TX Flow Control
3.4. Interrupts x
3.4.1. Legacy Interrupts 3.4.2. MSI 3.4.3. MSI-X
3.10. Hard IP Reconfiguration Interface x
3.10.1. Configuration Registers Access
3.10.1. Configuration Registers Access x
3.10.1.1. Direct User Avalon-MM Interface (Byte Access) 3.10.1.2. Debug Register Interface Access (Dword Access)
4. Advanced Features x
4.1. Virtualization Support 4.2. TLP Bypass Mode 4.3. Precision Time Measurement (PTM) 4.4. Scalable IOV
4.1. Virtualization Support x
4.1.1. Single Root I/O Virtualization (SR-IOV) 4.1.2. VirtIO
4.1.1. Single Root I/O Virtualization (SR-IOV) x
4.1.1.1. SR-IOV Implementation
4.1.1.1. SR-IOV Implementation x
4.1.1.1.1. Functional Level Reset (FLR)
4.1.2. VirtIO x
4.1.2.1. VirtIO Implementation 4.1.2.2. VirtIO Registers
4.2. TLP Bypass Mode x
4.2.1. Register Settings for TLP Bypass mode 4.2.2. Avalon-MM usage for TLP Bypass Mode 4.2.3. Transmit Interface 4.2.4. Receive Interface 4.2.5. Configuration TLP 4.2.6. Malformed TLP 4.2.7. ECRC
4.2.1. Register Settings for TLP Bypass mode x
4.2.1.1. TLPBYPASS_ERR_EN (Address 0x14194) 4.2.1.2. TLPBYPASS_ERR_STATUS (Address 0x14190)
5. Interfaces x
5.1. Overview 5.2. Clocks and Resets 5.3. Serial Data Interface 5.4. Avalon-ST Interface 5.5. Interrupt Interface 5.6. Hard IP Status Interface 5.7. Error Interface 5.8. 10-bit Tag Support Interface 5.9. Completion Timeout Interface 5.10. Power Management Interface 5.11. Hot Plug Interface (RP Only) 5.12. Configuration Output Interface 5.13. Configuration Intercept Interface (EP Only) 5.14. Hard IP Reconfiguration Interface 5.15. PHY Reconfiguration Interface 5.16. Page Request Service (PRS) Interface (EP Only) 5.17. FLR Interface Signals 5.18. PTM Interface Signals 5.19. VF Error Flag Interface Signals 5.20. VirtIO PCI Configuration Access Interface Signals
5.4. Avalon-ST Interface x
5.4.1. Avalon-ST RX Interface Signals 5.4.2. Avalon-ST TX Interface Signals
5.5. Interrupt Interface x
5.5.1. Legacy Interrupt Interface Signals 5.5.2. MSI Pending Bits Interface Signals
6. Parameters x
6.1. Top-Level Settings 6.2. Core Parameters
6.2. Core Parameters x
6.2.1. Avalon Parameters 6.2.2. Base Address Registers 6.2.3. PCI Express and PCI Capabilities Parameters 6.2.4. Device Identification Registers 6.2.5. Configuration, Debug and Extension Options 6.2.6. Analog Options
6.2.3. PCI Express and PCI Capabilities Parameters x
6.2.3.1. Device Capabilities 6.2.3.2. Link Capabilities 6.2.3.3. Legacy Interrupt Pin Register 6.2.3.4. MSI Capabilities 6.2.3.5. MSI-X Capabilities 6.2.3.6. Slot Capabilities 6.2.3.7. Latency Tolerance Reporting (LTR) 6.2.3.8. Process Address Space ID (PASID) 6.2.3.9. Device Serial Number Capability 6.2.3.10. Page Request Service (PRS) 6.2.3.11. Access Control Service (ACS) Capabilities 6.2.3.12. Power Management 6.2.3.13. Vendor Specific Extended Capability (VSEC) Registers 6.2.3.14. Precision Time Measurement (PTM) 6.2.3.15. Address Translation Services (ATS) 6.2.3.16. TLP Processing Hints (TPH) 6.2.3.17. VirtIO Parameters 6.2.3.18. Receiver Detection
7. Testbench x
7.1. FASTSIM Mode Support 7.2. Generating Tile Files 7.3. Endpoint Testbench 7.4. Test Driver Module 7.5. Root Port BFM 7.6. BFM Procedures and Functions 7.7. PIPE Mode Simulation
7.5. Root Port BFM x
7.5.1. BFM Memory Map 7.5.2. Configuration Space Bus and Device Numbering 7.5.3. Configuration of Root Port and Endpoint 7.5.4. Issuing Read and Write Transactions to the Application Layer
7.6. BFM Procedures and Functions x
7.6.1. ebfm_barwr Procedure 7.6.2. ebfm_barwr_imm Procedure 7.6.3. ebfm_barrd_wait Procedure 7.6.4. ebfm_barrd_nowt Procedure 7.6.5. ebfm_cfgwr_imm_wait Procedure 7.6.6. ebfm_cfgwr_imm_nowt Procedure 7.6.7. ebfm_cfgrd_wait Procedure 7.6.8. ebfm_cfgrd_nowt Procedure 7.6.9. BFM Configuration Procedures 7.6.10. BFM Shared Memory Access Procedures 7.6.11. BFM Log and Message Procedures 7.6.12. Verilog HDL Formatting Functions
7.6.9. BFM Configuration Procedures x
7.6.9.1. ebfm_cfg_rp_ep Procedure 7.6.9.2. ebfm_cfg_decode_bar Procedure
7.6.10. BFM Shared Memory Access Procedures x
7.6.10.1. Shared Memory Constants 7.6.10.2. shmem_write Task 7.6.10.3. shmem_read Function 7.6.10.4. shmem_display Verilog HDL Function 7.6.10.5. shmem_fill Procedure 7.6.10.6. shmem_chk_ok Function
7.6.11. BFM Log and Message Procedures x
7.6.11.1. ebfm_display Verilog HDL Function 7.6.11.2. ebfm_log_stop_sim Verilog HDL Function 7.6.11.3. ebfm_log_set_suppressed_msg_mask Task 7.6.11.4. ebfm_log_set_stop_on_msg_mask Verilog HDL Task 7.6.11.5. ebfm_log_open Verilog HDL Function 7.6.11.6. ebfm_log_close Verilog HDL Function
7.6.12. Verilog HDL Formatting Functions x
7.6.12.1. himage1 7.6.12.2. himage2 7.6.12.3. himage4 7.6.12.4. himage8 7.6.12.5. himage16 7.6.12.6. dimage1 7.6.12.7. dimage2 7.6.12.8. dimage3 7.6.12.9. dimage4 7.6.12.10. dimage5 7.6.12.11. dimage6 7.6.12.12. dimage7
7.7. PIPE Mode Simulation x
7.7.1. PIPE Mode Clock Signal 7.7.2. PIPE Mode Reset Signal To Verification IP (VIP)
8. Troubleshooting/Debugging x
8.1. Hardware 8.2. Debug Toolkit
8.1. Hardware x
8.1.1. Debugging Link Training Issues 8.1.2. Debugging Data Transfer and Performance Issues
8.1.1. Debugging Link Training Issues x
8.1.1.1. Generic Tools and Utilities 8.1.1.2. Signal Tap II Logic Analyzer 8.1.1.3. Additional Debug Tools
8.1.1.3. Additional Debug Tools x
8.1.1.3.1. Using the Hard IP Reconfiguration Interface 8.1.1.3.2. Enable and Read LCRC and ECRC Error Count
8.1.2. Debugging Data Transfer and Performance Issues x
8.1.2.1. Advanced Error Reporting (AER) 8.1.2.2. Second-Level Debug Tools
8.2. Debug Toolkit x
8.2.1. Overview 8.2.2. Enabling the F-Tile Debug Toolkit 8.2.3. Launching the F-Tile Debug Toolkit 8.2.4. Using the F-Tile Debug Toolkit 8.2.5. Using the F-Tile Link Inspector
8.2.4. Using the F-Tile Debug Toolkit x
8.2.4.1. Main View 8.2.4.2. Toolkit Parameters 8.2.4.3. Channel Parameters 8.2.4.4. Eye Viewer
8.2.4.2. Toolkit Parameters x
8.2.4.2.1. F-Tile Information 8.2.4.2.2. Event Counter 8.2.4.2.3. P0/P1 Configuration Space
8.2.4.3. Channel Parameters x
8.2.4.3.1. General PHY 8.2.4.3.2. TX Path 8.2.4.3.3. RX Path
A. Configuration Space Registers x
A.1. Configuration Space Registers A.2. Configuration Space Registers for Virtualization A.3. Intel-Defined VSEC Capability Registers
A.1. Configuration Space Registers x
A.1.1. Register Access Definitions A.1.2. PCIe Configuration Header Registers A.1.3. PCI Express Capability Structures A.1.4. Physical Layer 16.0 GT/s Extended Capability Structure A.1.5. MSI-X Registers
A.2. Configuration Space Registers for Virtualization x
A.2.1. SR-IOV Virtualization Extended Capabilities Registers Address Map A.2.2. PCIe Configuration Registers for Each Virtual Function
A.2.2. PCIe Configuration Registers for Each Virtual Function x
A.2.2.1. Alternative Routing ID (ARI) Capability Structure A.2.2.2. TLP Processing Hint (TPH) Capability Structure A.2.2.3. Address Translation Services (ATS) Capability Structure A.2.2.4. Access Control Services (ACS) Capability Structure
A.2.2.1. Alternative Routing ID (ARI) Capability Structure x
A.2.2.1.1. ARI Enhanced Capability Header Register (Offset 0x0) A.2.2.1.2. ARI Capability and Control Register (Offset 0x4)
A.2.2.2. TLP Processing Hint (TPH) Capability Structure x
A.2.2.2.1. TPH Requester Enhanced Capability Header (Offset 0x0) A.2.2.2.2. TPH Requester Capability Register (Offset 0x4) A.2.2.2.3. TPH Requester Control Register (Offset 0x8)
A.2.2.3. Address Translation Services (ATS) Capability Structure x
A.2.2.3.1. ATS Enhanced Capability Header (Offset 0x0) A.2.2.3.2. ATS Capability Register and ATS Control Register (Offset 0x4)
A.2.2.4. Access Control Services (ACS) Capability Structure x
A.2.2.4.1. ACS Extended Capability Header (Offset 0x0) A.2.2.4.2. ACS Capability Register (Offset 0x4) A.2.2.4.3. ACS Control Register (Offset 0x6) A.2.2.4.4. Egress Control Vector (Offset 0x8)
A.3. Intel-Defined VSEC Capability Registers x
A.3.1. Intel-Defined VSEC Capability Header (Offset 00h) A.3.2. Intel-Defined Vendor Specific Header (Offset 04h) A.3.3. Intel Marker (Offset 08h) A.3.4. JTAG Silicon ID (Offset 0x0C - 0x18) A.3.5. User Configurable Device and Board ID (Offset 0x1C - 0x1D) A.3.6. General Purpose Control and Status Register (Offset 0x30) A.3.7. Uncorrectable Internal Error Status Register (Offset 0x34) A.3.8. Uncorrectable Internal Error Mask Register (Offset 0x38) A.3.9. Correctable Internal Error Status Register (Offset 0x3C) A.3.10. Correctable Internal Error Mask Register (Offset 0x40)
B. Implementation of Address Translation Services (ATS) in Endpoint Mode x
B.1. Sending Translated/Untranslated Requests B.2. Sending a Page Request Message from the Endpoint (EP) to the Root Complex (RC) B.3. Invalidating Requests/Completions
C. Packets Forwarded to the User Application in TLP Bypass Mode x
C.1. EP TLP Bypass Mode (Upstream) C.2. RC TLP Bypass Mode (Downstream)
E. Bifurcated Endpoint Support for Independent Resets x
E.1. PCI Express Resets E.2. Supported Configurations
E.2. Supported Configurations x
E.2.1. Configuration Type A E.2.2. Configuration Type B E.2.3. Configuration Type C
1. Acronyms
2. Introduction
3. IP Architecture and Functional Description
4. Advanced Features
5. Interfaces
6. Parameters
7. Testbench
8. Troubleshooting/Debugging
9. F-Tile Avalon Streaming Intel FPGA IP for PCI Express User Guide Archives
10. Revision History for the F-Tile Avalon Streaming Intel FPGA IP for PCI Express User Guide
A. Configuration Space Registers
B. Implementation of Address Translation Services (ATS) in Endpoint Mode
C. Packets Forwarded to the User Application in TLP Bypass Mode
D. Root Port Enumeration
E. Bifurcated Endpoint Support for Independent Resets

7.5. Root Port BFM

The basic Root Port BFM provides a Verilog HDL task‑based interface to request transactions to issue on the PCI Express link. The Root Port BFM also handles requests received from the PCI Express link. The following figure shows the major modules in the Root Port BFM.

Figure 72. Root Port BFM

These modules implement the following functionality:

  • BFM Log Interface, altpcietb_g3bfm_log.v and altpcietb_bfm_rp_gen3_x8.sv: The BFM Log Interface provides routines for writing commonly formatted messages to the simulator standard output and optionally to a log file. It also provides controls that stop simulations on errors.
  • BFM Read/Write Request Functions, altpcietb_bfm_rp_gen3_x8.sv: These functions provide the basic BFM calls for PCI Express read and write requests.
  • BFM Configuration Functions, altpcietb_g3bfm_configure.v : These functions provide the BFM calls to request a configuration of the PCI Express link and the Endpoint Configuration Space registers.
  • BFM shared memory, altpcietb_g3bfm_shmem.v: This module provides the Root Port BFM shared memory. It implements the following functionality:
    • Provides data for TX write operations
    • Provides data for RX read operations
    • Receives data for RX write operations
    • Receives data for received completions
  • BFM Request Interface, altpcietb_g3bfm_req_intf.v: This interface provides the low-level interface between the altpcietb_g3bfm_rdwr and altpcietb_g3bfm_configure procedures or functions and the Root Port RTL Model. This interface stores a write-protected data structure containing the sizes and values programmed in the BAR registers of the Endpoint. It also stores other critical data used for internal BFM management.
  • altpcietb_g3bfm_rdwr.v: This module contains the low-level read and write tasks.
  • Avalon‑ST Interfaces, altpcietb_g3bfm_vc_intf_ast_common.v: These interface modules handle the Root Port interface model. They take requests from the BFM request interface and generate the required PCI Express transactions. They handle completions received from the PCI Express link and notify the BFM request interface when requests are complete. Additionally, they handle any requests received from the PCI Express link, and store or fetch data from the shared memory before generating the required completions.

In the PIO design example, the apps_type_hwtcl parameter is set to 3. The tests run under this parameter value are defined in ebfm_cfg_rp_ep_rootport, find_mem_bar and downstream_loop.

The function ebfm_cfg_rp_ep_rootport is described in altpcietb_g3bfm_configure.v. This function performs the steps necessary to configure the root port and the endpoint on the link. It includes:
  • Root port memory allocation
  • Root port configuration space (base limit, bus number, etc.)
  • Endpoint configuration (BAR, Bus Master enable, max payload size, etc.)

The functions find_mem_bar and downstream_loop in altpcietb_bfm_rp_gen3_x8.sv return the BAR implemented and perform the memory Write and Read accesses to the BAR, respectively.


Section Content
BFM Memory Map
Configuration Space Bus and Device Numbering
Configuration of Root Port and Endpoint
Issuing Read and Write Transactions to the Application Layer

Level Two Title