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1. Datasheet
2. Getting Started with the Cyclone V Hard IP for PCI Express
3. Parameter Settings
4. Interfaces and Signal Descriptions
5. Registers
6. Interrupts
7. Error Handling
8. IP Core Architecture
9. Transaction Layer Protocol (TLP) Details
10. Throughput Optimization
11. Design Implementation
12. Additional Features
13. Hard IP Reconfiguration
14. Transceiver PHY IP Reconfiguration
15. Testbench and Design Example
16. Debugging
A. Frequently Asked Questions for PCI Express
B. Lane Initialization and Reversal
C. Document Revision History
1.1. Cyclone V Avalon-ST Interface for PCIe Datasheet
1.2. Features
1.3. Release Information
1.4. Device Family Support
1.5. Configurations
1.6. Example Designs
1.7. Debug Features
1.8. IP Core Verification
1.9. Performance and Resource Utilization
1.10. Recommended Speed Grades
1.11. Creating a Design for PCI Express
4.1. Clock Signals
4.2. Reset, Status, and Link Training Signals
4.3. ECRC Forwarding
4.4. Error Signals
4.5. Interrupts for Endpoints
4.6. Interrupts for Root Ports
4.7. Completion Side Band Signals
4.8. LMI Signals
4.9. Transaction Layer Configuration Space Signals
4.10. Hard IP Reconfiguration Interface
4.11. Power Management Signals
4.12. Physical Layer Interface Signals
15.6.1. ebfm_barwr Procedure
15.6.2. ebfm_barwr_imm Procedure
15.6.3. ebfm_barrd_wait Procedure
15.6.4. ebfm_barrd_nowt Procedure
15.6.5. ebfm_cfgwr_imm_wait Procedure
15.6.6. ebfm_cfgwr_imm_nowt Procedure
15.6.7. ebfm_cfgrd_wait Procedure
15.6.8. ebfm_cfgrd_nowt Procedure
15.6.9. BFM Configuration Procedures
15.6.10. BFM Shared Memory Access Procedures
15.6.11. BFM Log and Message Procedures
15.6.12. Verilog HDL Formatting Functions
15.7.1. Changing Between Serial and PIPE Simulation
15.7.2. Using the PIPE Interface for Gen1 and Gen2 Variants
15.7.3. Viewing the Important PIPE Interface Signals
15.7.4. Disabling the Scrambler for Gen1 and Gen2 Simulations
15.7.5. Disabling 8B/10B Encoding and Decoding for Gen1 and Gen2 Simulations
15.7.6. Changing between the Hard and Soft Reset Controller
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15.5. Root Port BFM Overview
The basic Root Port BFM provides 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 most important modules in the Root Port BFM.
Figure 50. Root Port BFM
These modules implement the following functionality:
- BFM Log Interface,altpcietb_bfm_log.v and altlpcietb_bfm_rp_<gen>_x8.v: The BFM log functions provides routine for writing commonly formatted messages to the simulator standard output and optionally to a log file. It also provides controls that stop simulation on errors. For details on these procedures, refer to BFM Log and Message Procedures.
- BFM Read/Write Request Functions, altpcietb_bfm_rp_<gen>_x8.sv: These functions provide the basic BFM calls for PCI Express read and write requests. For details on these procedures, refer to BFM Read and Write Procedures.
- BFM Log Interface, altpcietb_bfm_log.v and altlpcietb_bfm_rp_<gen>_x8.v: The BFM log functions provides routine for writing commonly formatted messages to the simulator standard output and optionally to a log file. It also provides controls that stop simulation on errors. For details on these procedures, refer to BFM Log and Message Procedures.
- BFM Configuration Functions, altpcietb_g3bfm_configure.v : These functions provide the BFM calls to request configuration of the PCI Express link and the Endpoint Configuration Space registers. For details on these procedures and functions, refer to BFM Configuration Procedures.
- BFM shared memory, altpcietb_g3bfm_shmem_common.v: This modules 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_bfm_configure procedures or functions and the Root Port RTL Model. This interface stores a write-protected data structure containing the sizes and the values programmed in the BAR registers of the Endpoint. It also stores other critical data used for internal BFM management. You do not need to access these files directly to adapt the testbench to test your Endpoint application.
- 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.