L-Tile and H-Tile Avalon® Memory-mapped Intel® FPGA IP for PCI Express* User Guide

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ID 683667
Date 9/13/2024
Public
Document Table of Contents
Document Table of Contents x
1. Introduction 2. Quick Start Guide 3. Interface Overview 4. Parameters 5. Designing with the IP Core 6. Block Descriptions 7. Registers 8. Programming Model for the DMA Descriptor Controller 9. Programming Model for the Avalon® -MM Root Port 10. Avalon-MM Testbench and Design Example 11. Document Revision History A. PCI Express Core Architecture B. Root Port Enumeration C. Troubleshooting and Observing the Link Status
1. Introduction x
1.1. Avalon-MM Interface for PCIe 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. Quick Start Guide x
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. Interface Overview x
3.1. Avalon-MM DMA Interfaces when Descriptor Controller Is Internally Instantiated 3.2. Avalon-MM DMA Interfaces when Descriptor Controller is Externally Instantiated 3.3. Other Avalon-MM Interfaces 3.4. Clocks and Reset 3.5. System Interfaces
3.3. Other Avalon-MM Interfaces x
3.3.1. Avalon-MM Master Interfaces 3.3.2. Avalon-MM Slave Interfaces 3.3.3. Control Register Access (CRA) Avalon-MM Slave
4. Parameters x
4.1. Avalon-MM Settings 4.2. Base Address Registers 4.3. Device Identification Registers 4.4. PCI Express and PCI Capabilities Parameters 4.5. Configuration, Debug and Extension Options 4.6. PHY Characteristics 4.7. Example Designs
4.4. PCI Express and PCI Capabilities Parameters x
4.4.1. Device Capabilities 4.4.2. Link Capabilities 4.4.3. MSI and MSI-X Capabilities 4.4.4. Slot Capabilities 4.4.5. Power Management 4.4.6. Vendor Specific Extended Capability (VSEC)
5. Designing with the IP Core x
5.1. Generation 5.2. Simulation 5.3. IP Core Generation Output ( Quartus® Prime Pro Edition) 5.4. Channel Layout and PLL Usage
6. Block Descriptions x
6.1. Interfaces
6.1. Interfaces x
6.1.1. Stratix® 10 DMA Avalon-MM DMA Interface to the Application Layer 6.1.2. Avalon-MM Interface to the Application Layer 6.1.3. Clocks and Reset 6.1.4. Interrupts 6.1.5. Flush Requests 6.1.6. Serial Data, PIPE, Status, Reconfiguration, and Test Interfaces
6.1.1. Stratix® 10 DMA Avalon-MM DMA Interface to the Application Layer x
6.1.1.1. Descriptor Controller Interfaces when Instantiated Internally 6.1.1.2. Write DMA Avalon-MM Master Port 6.1.1.3. Descriptor Controller Interfaces when Instantiated Externally
6.1.1.1. Descriptor Controller Interfaces when Instantiated Internally x
6.1.1.1.1. Read Data Mover 6.1.1.1.2. Read Descriptor Controller Avalon-MM Master interface 6.1.1.1.3. Write Descriptor Controller Avalon-MM Master Interface 6.1.1.1.4. Read Descriptor Table Avalon-MM Slave Interface 6.1.1.1.5. Write Descriptor Table Avalon-MM Slave Interface
6.1.1.3. Descriptor Controller Interfaces when Instantiated Externally x
6.1.1.3.1. Avalon® -ST Descriptor Source
6.1.2. Avalon-MM Interface to the Application Layer x
6.1.2.1. Bursting and Non-Bursting Avalon® -MM Module Signals 6.1.2.2. Non-Bursing Slave Module 6.1.2.3. 32-Bit Control Register Access (CRA) Slave Signals 6.1.2.4. Bursting Slave Module
6.1.3. Clocks and Reset x
6.1.3.1. Clocks 6.1.3.2. Resets
6.1.4. Interrupts x
6.1.4.1. MSI Interrupts for Endpoints 6.1.4.2. Legacy Interrupts
6.1.6. Serial Data, PIPE, Status, Reconfiguration, and Test Interfaces x
6.1.6.1. Serial Data Interface 6.1.6.2. PIPE Interface 6.1.6.3. Hard IP Status Interface 6.1.6.4. Hard IP Reconfiguration 6.1.6.5. Test Interface
7. Registers x
7.1. Configuration Space Registers 7.2. Avalon-MM DMA Bridge Registers
7.1. Configuration Space Registers x
7.1.1. Register Access Definitions 7.1.2. PCI Configuration Header Registers 7.1.3. PCI Express Capability Structures 7.1.4. Intel Defined VSEC Capability Header 7.1.5. Uncorrectable Internal Error Status Register 7.1.6. Uncorrectable Internal Error Mask Register 7.1.7. Correctable Internal Error Status Register 7.1.8. Correctable Internal Error Mask Register
7.1.4. Intel Defined VSEC Capability Header x
7.1.4.1. Intel Defined Vendor Specific Header 7.1.4.2. Intel Marker 7.1.4.3. JTAG Silicon ID 7.1.4.4. User Configurable Device and Board ID
7.2. Avalon-MM DMA Bridge Registers x
7.2.1. PCI Express Avalon-MM Bridge Register Address Map 7.2.2. DMA Descriptor Controller Registers
7.2.1. PCI Express Avalon-MM Bridge Register Address Map x
7.2.1.1. Avalon-MM to PCI Express Interrupt Status Registers 7.2.1.2. Avalon-MM to PCI Express Interrupt Enable Registers 7.2.1.3. Address Mapping for High-Performance Avalon-MM 32-Bit Slave Modules 7.2.1.4. PCI Express to Avalon-MM Interrupt Status and Enable Registers for Endpoints 7.2.1.5. PCI Express Configuration Information Registers
7.2.2. DMA Descriptor Controller Registers x
7.2.2.1. Read DMA Internal Descriptor Controller Registers 7.2.2.2. Write DMA Internal Descriptor Controller Registers
8. Programming Model for the DMA Descriptor Controller x
8.1. Read DMA Example 8.2. Write DMA Example 8.3. Software Program for Simultaneous Read and Write DMA 8.4. Read DMA and Write DMA Descriptor Format
9. Programming Model for the Avalon® -MM Root Port x
9.1. Root Port TLP Data Control and Status Registers 9.2. Sending a TLP 9.3. Receiving a Non-Posted Completion TLP 9.4. Example of Reading and Writing BAR0 Using the CRA Interface
10. Avalon-MM Testbench and Design Example x
10.1. Avalon-MM Endpoint Testbench 10.2. Endpoint Design Example 10.3. Avalon® -MM Test Driver Module 10.4. Root Port BFM 10.5. BFM Procedures and Functions
10.2. Endpoint Design Example x
10.2.1. BAR Setup
10.4. Root Port BFM x
10.4.1. Overview 10.4.2. Issuing Read and Write Transactions to the Application Layer 10.4.3. Configuration of Root Port and Endpoint 10.4.4. Configuration Space Bus and Device Numbering 10.4.5. BFM Memory Map
10.5. BFM Procedures and Functions x
10.5.1. ebfm_barwr Procedure 10.5.2. ebfm_barwr_imm Procedure 10.5.3. ebfm_barrd_wait Procedure 10.5.4. ebfm_barrd_nowt Procedure 10.5.5. ebfm_cfgwr_imm_wait Procedure 10.5.6. ebfm_cfgwr_imm_nowt Procedure 10.5.7. ebfm_cfgrd_wait Procedure 10.5.8. ebfm_cfgrd_nowt Procedure 10.5.9. BFM Configuration Procedures 10.5.10. BFM Shared Memory Access Procedures 10.5.11. BFM Log and Message Procedures 10.5.12. Verilog HDL Formatting Functions
10.5.9. BFM Configuration Procedures x
10.5.9.1. ebfm_cfg_rp_ep Procedure 10.5.9.2. ebfm_cfg_decode_bar Procedure
10.5.10. BFM Shared Memory Access Procedures x
10.5.10.1. Shared Memory Constants 10.5.10.2. shmem_write Task 10.5.10.3. shmem_read Function 10.5.10.4. shmem_display Verilog HDL Function 10.5.10.5. shmem_fill Procedure 10.5.10.6. shmem_chk_ok Function
10.5.11. BFM Log and Message Procedures x
10.5.11.1. ebfm_display Verilog HDL Function 10.5.11.2. ebfm_log_stop_sim Verilog HDL Function 10.5.11.3. ebfm_log_set_suppressed_msg_mask Task 10.5.11.4. ebfm_log_set_stop_on_msg_mask Verilog HDL Task 10.5.11.5. ebfm_log_open Verilog HDL Function 10.5.11.6. ebfm_log_close Verilog HDL Function
10.5.12. Verilog HDL Formatting Functions x
10.5.12.1. himage1 10.5.12.2. himage2 10.5.12.3. himage4 10.5.12.4. himage8 10.5.12.5. himage16 10.5.12.6. dimage1 10.5.12.7. dimage2 10.5.12.8. dimage3 10.5.12.9. dimage4 10.5.12.10. dimage5 10.5.12.11. dimage6 10.5.12.12. dimage7
11. Document Revision History x
11.1. Document Revision History for the L-Tile and H-Tile Avalon® Memory-mapped Intel® FPGA IP for PCI Express* User Guide
A. PCI Express Core Architecture x
A.1. Transaction Layer A.2. Data Link Layer A.3. Physical Layer
C. Troubleshooting and Observing the Link Status x
C.1. Troubleshooting C.2. PCIe Link Inspector Overview
C.1. Troubleshooting x
C.1.1. Simulation Fails To Progress Beyond Polling.Active State C.1.2. Hardware Bring-Up Issues C.1.3. Link Training C.1.4. Use Third-Party PCIe Analyzer
C.2. PCIe Link Inspector Overview x
C.2.1. PCIe* Link Inspector Hardware
C.2.1. PCIe* Link Inspector Hardware x
C.2.1.1. Enabling the PCIe* Link Inspector C.2.1.2. Launching the PCIe* Link Inspector C.2.1.3. The PCIe* Link Inspector LTSSM Monitor C.2.1.4. Accessing the Configuration Space and Transceiver Registers C.2.1.5. Additional Status Commands
C.2.1.3. The PCIe* Link Inspector LTSSM Monitor x
C.2.1.3.1. LTSSM Monitor Registers C.2.1.3.2. ltssm_save2file <file_name> C.2.1.3.3. ltssm_file2console C.2.1.3.4. ltssm_debug_check C.2.1.3.5. ltssm_display <num_states> C.2.1.3.6. ltssm_save_oldstates
C.2.1.4. Accessing the Configuration Space and Transceiver Registers x
C.2.1.4.1. PCIe* Link Inspector Commands C.2.1.4.2. NPDME PLL and Channel Commands C.2.1.4.3. Register Address Map
C.2.1.5. Additional Status Commands x
C.2.1.5.1. Displaying PLL Lock and Calibration Status Registers
1. Introduction
2. Quick Start Guide
3. Interface Overview
4. Parameters
5. Designing with the IP Core
6. Block Descriptions
7. Registers
8. Programming Model for the DMA Descriptor Controller
9. Programming Model for the Avalon® -MM Root Port
10. Avalon-MM Testbench and Design Example
11. Document Revision History
A. PCI Express Core Architecture
B. Root Port Enumeration
C. Troubleshooting and Observing the Link Status

10.2. Endpoint Design Example

This design example comprises a native Endpoint, a DMA application and a Root Port BFM. The write DMA module implements write operations from the Endpoint memory to the Root Complex (RC) memory. The read DMA implements read operations from the RC memory to the Endpoint memory.

When operating on a hardware platform, a software application running on the Root Complex processor typically controls the DMA. In simulation, the generated testbench, along with this design example, provide a BFM driver module in Verilog HDL that controls the DMA operations. Because the example relies on no other hardware interface than the PCI Express link, you can use the design example for the initial hardware validation of your system.

System generation creates the Endpoint variant in Verilog HDL. The testbench files are only available in Verilog HDL in the current release.

Note:

To run the DMA tests using MSI, you must set the Number of MSI messages requested parameter under the PCI Express/PCI Capabilities page to at least 2.

The DMA design example uses an architecture capable of transferring a large amount of fragmented memory without accessing the DMA registers for every memory block. For each memory block, the DMA design example uses a descriptor table containing the following information:

  • Size of the transfer
  • Address of the source
  • Address of the destination
  • Control bits to set the handshaking behavior between the software application or BFM driver and the DMA module
Note: The DMA design example only supports DWORD‑aligned accesses. The DMA design example does not support ECRC forwarding.

The BFM driver writes the descriptor tables into BFM shared memory, from which the DMA design engine continuously collects the descriptor tables for DMA read, DMA write, or both. At the beginning of the transfer, the BFM programs the Endpoint DMA control register. The DMA control register indicates the total number of descriptor tables and the BFM shared memory address of the first descriptor table. After programming the DMA control register, the DMA engine continuously fetches descriptors from the BFM shared memory for both DMA reads and DMA writes, and then performs the data transfer for each descriptor.

The following figure shows a block diagram of the design example connected to an external RC CPU.

Figure 69. Top-Level DMA Example for Simulation

The block diagram contains the following elements:

  • The DMA application connects to the Avalon® -MM interface of the Intel L-/H-Tile Avalon-MM for PCI ExpressIP core. The connections consist of the following interfaces:
    • The Avalon® -MM RX master receives TLP header and data information from the Hard IP block.
    • The Avalon® -MM TX slave transmits TLP header and data information to the Hard IP block.
    • The Avalon® -MM control register access (CRA) IRQ port requests MSI interrupts from the Hard IP block.
    • The sideband signal bus carries static information such as configuration information.
  • The BFM shared memory stores the descriptor tables for the DMA read and the DMA write operations.
  • A Root Complex CPU and associated PCI Express* PHY connect to the Endpoint design example, using a Root Port.

The example Endpoint design and application accomplish the following objectives:

  • Show you how to interface to the Intel L-/H-Tile Avalon-MM for PCI Express using the Avalon-MM protocol.
  • Provide a DMA channel that initiates memory read and write transactions on the PCI Express* link.

The DMA design example hierarchy consists of these components:

  • A DMA read and a DMA write module
  • An on-chip Endpoint memory (Avalon-MM slave) which uses two Avalon-MM interfaces for each engine

The RC slave module typically drives downstream transactions which target the Endpoint on‑chip buffer memory. These target memory transactions bypass the DMA engines. In addition, the RC slave module monitors performance and acknowledges incoming message TLPs.


Section Content
BAR Setup

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