GTS AXI Streaming Intel® FPGA IP for PCI Express* User Guide

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ID 813754
Date 8/07/2024
Public
Document Table of Contents
Document Table of Contents x
1. Introduction 2. Features 3. Getting Started with GTS AXI Streaming IP 4. IP Architecture and Functional Description 5. IP Parameters for E-Series FPGA 6. IP Parameters for D-Series FPGAs 7. Interfaces and Signals 8. Registers 9. Document Revision History for the GTS AXI Streaming Intel® FPGA IP for PCI Express* User Guide A. Troubleshooting/Debugging B. PIPE Mode Simulation
1. Introduction x
1.1. About PCI Express* 1.2. Goal of the GTS AXI Streaming Intel® FPGA IP for PCI Express* User Guide 1.3. Example Use Models
2. Features x
2.1. Supported Features 2.2. IP Support Status 2.3. Release Information 2.4. Recommended FPGA Fabric Speed Grades 2.5. Resource Utilization 2.6. IP Core and Design Example Support Levels
3. Getting Started with GTS AXI Streaming IP x
3.1. Downloading and Installing Quartus® Prime Software 3.2. Configuring and Generating the GTS AXI Streaming IP 3.3. Configuring and Generating GTS System PLL Clocks Intel® FPGA IP 3.4. Configuring and Generating GTS Reset Sequencer Intel® FPGA IP 3.5. Instantiating and Connecting GTS AXI Streaming IP Interfaces (and Other IPs) 3.6. Simulating the GTS AXI Streaming IP Variant 3.7. Compiling the GTS AXI Streaming IP Variant
4. IP Architecture and Functional Description x
4.1. Clocking 4.2. Resets 4.3. PCIe* Hard IP 4.4. Hard IP Interface (IF) Adaptor 4.5. Interrupts 4.6. Transaction Ordering 4.7. TX Non-Posted Metering Requirement on Application 4.8. AXI4-Stream Interface 4.9. Tag Allocation 4.10. Precision Time Measurement (PTM) 4.11. Single Root I/O Virtualization (SR-IOV) 4.12. Transaction Layer Packet (TLP) Bypass Mode 4.13. Scalable IOV
4.1. Clocking x
4.1.1. Reference Clock
4.5. Interrupts x
4.5.1. Legacy Interrupt 4.5.2. Message Signaled Interrupts (MSI) 4.5.3. Message Signal Interrupt Extended (MSI-X)
4.8. AXI4-Stream Interface x
4.8.1. Header Format 4.8.2. Prefix Format 4.8.3. Function Number Format 4.8.4. BAR Number Format 4.8.5. Data and Header Packing Scheme
4.11. Single Root I/O Virtualization (SR-IOV) x
4.11.1. SR-IOV Implementation
4.12. Transaction Layer Packet (TLP) Bypass Mode x
4.12.1. AXI-Lite Usage for TLP Bypass Mode 4.12.2. Configuration TLP 4.12.3. Transmit Interface 4.12.4. Receive Interface 4.12.5. Malformed TLP 4.12.6. ECRC
5. IP Parameters for E-Series FPGA x
5.1. PCIe* Interfaces 0 Settings 5.2. AXI Interfaces 0 Settings 5.3. PCIe* 0 Settings
5.3. PCIe* 0 Settings x
5.3.1. PCIe* 0 Base Address Registers 5.3.2. PCIe* 0 Device Identification Registers 5.3.3. PCIe* 0 PCI Express* / PCI Capabilities
6. IP Parameters for D-Series FPGAs x
6.1. PCIe Interface 0 Settings 6.2. AXI Interfaces 0 Settings 6.3. PCIe0/PCIe1 Settings
6.3. PCIe0/PCIe1 Settings x
6.3.1. PCIe0/PCIe1 Base Address Registers 6.3.2. PCIe0/PCIe1 Device Identification Registers 6.3.3. PCIe0/PCIe1 PCI Express / PCI Capabilities
7. Interfaces and Signals x
7.1. Overview 7.2. Clocks and Resets 7.3. AXI4-Stream Interfaces 7.4. Configuration Intercept Interface 7.5. Control Shadow Interface 7.6. Transmit Flow Control Credit Interface 7.7. Completion Timeout Interface 7.8. Control and Status Register Responder Interface 7.9. Function Level Reset Interface 7.10. TLP Bypass Error Reporting Interface 7.11. VF Error Flag Interface 7.12. Precision Time Measurement (PTM) Interface 7.13. Serial Data Signals 7.14. Miscellaneous Signals
7.2. Clocks and Resets x
7.2.1. Interface Clock Signals 7.2.2. Interface Reset Signals
7.3. AXI4-Stream Interfaces x
7.3.1. AXI4-Stream Receive (RX) Interface 7.3.2. AXI4-Stream Transmit (TX) Interface
7.4. Configuration Intercept Interface x
7.4.1. Configuration Intercept Request Interface 7.4.2. Configuration Intercept Response Interface
7.9. Function Level Reset Interface x
7.9.1. Function Level Reset Received Interface 7.9.2. Function Level Reset Completion Interface
8. Registers x
8.1. Register Address Map 8.2. PCI Express* Configuration Space 8.3. HIP Port and Status Registers 8.4. Soft Register Address Map 8.5. Indirect Register Access 8.6. Virtual Function (VF) PCI Express* Configuration Space 8.7. Intel-Defined VSEC Capability Register
8.2. PCI Express* Configuration Space x
8.2.1. PCI Express* Configuration Header Registers 8.2.2. PCI Express* Capability Structures 8.2.3. Physical Layer 16.0 GT/s Extended Capability Structures
8.3. HIP Port and Status Registers x
8.3.1. Root Port Interrupt Registers 8.3.2. PTM Registers
8.4. Soft Register Address Map x
8.4.1. Control Registers 8.4.2. Debug Registers 8.4.3. Performance Monitor Registers
8.6. Virtual Function (VF) PCI Express* Configuration Space x
8.6.1. VF PCI-Compatible Configuration Space Header Type0 8.6.2. VF PCI Express* Capability Structure 8.6.3. VF Message Signal Interrupt Extended (MSI-X) Capability Structure 8.6.4. VF Alternative Routing ID (ARI) Capability Structure 8.6.5. VF TLP Processing Hints (TPH) Capability Structure 8.6.6. VF Address Translation Services (ATS) Capability Structure 8.6.7. VF Access Control Services (ACS) Capability Structure
8.6.1. VF PCI-Compatible Configuration Space Header Type0 x
8.6.1.1. Vendor ID and Device ID Registers 8.6.1.2. Command Registers 8.6.1.3. Status Registers 8.6.1.4. Revision ID and Class Code Register 8.6.1.5. BIST, Header Type, Latency Timer, and Cache Line Size Registers 8.6.1.6. Subsystem Vendor ID and Subsystem ID Register 8.6.1.7. Capabilities Pointer
8.6.2. VF PCI Express* Capability Structure x
8.6.2.1. PCI Express* Capability List Register 8.6.2.2. PCI Express* Device Capabilities Register 8.6.2.3. PCI Express* Device Control and Status Register 8.6.2.4. Link Capabilities Register 8.6.2.5. Link Control and Status Register 8.6.2.6. PCI Express* Device Capabilities 2 Register 8.6.2.7. PCI Express* Device Control and Status 2 Register 8.6.2.8. Link Capabilities 2 Register 8.6.2.9. Link Control and Status 2 Register
8.6.3. VF Message Signal Interrupt Extended (MSI-X) Capability Structure x
8.6.3.1. MSI-X Control Register 8.6.3.2. MSI-X Table Offset Register 8.6.3.3. MSI-X Pending Bit Array Register
8.6.4. VF Alternative Routing ID (ARI) Capability Structure x
8.6.4.1. ARI Enhanced Capability Header Register 8.6.4.2. ARI Capability and Control Registers
8.6.5. VF TLP Processing Hints (TPH) Capability Structure x
8.6.5.1. TPH Requester Enhanced Capability Header 8.6.5.2. TPH Requester Capability Register 8.6.5.3. TPH Requester Control Register
8.6.6. VF Address Translation Services (ATS) Capability Structure x
8.6.6.1. ATS Enhanced Capability Header 8.6.6.2. ATS Capability Register and Control Register
8.6.7. VF Access Control Services (ACS) Capability Structure x
8.6.7.1. ACS Extended Capability Header 8.6.7.2. ACS Capability and Control Register 8.6.7.3. Egress Control Vector
A. Troubleshooting/Debugging x
A.1. Hardware A.2. Debug Toolkit
A.1. Hardware x
A.1.1. Debugging Link Training Issues A.1.2. Debugging Data Transfer and Performance Issues
A.1.1. Debugging Link Training Issues x
A.1.1.1. Generic Tools and Utilities A.1.1.2. Signal Tap Logic Analyzer
A.2. Debug Toolkit x
A.2.1. Overview A.2.2. Enabling the Agilex™ 5 Debug Toolkit A.2.3. Launching the Agilex™ 5 Debug Toolkit A.2.4. Using the Agilex™ 5 Debug Toolkit A.2.5. Using the Agilex™ 5 Link Inspector
A.2.4. Using the Agilex™ 5 Debug Toolkit x
A.2.4.1. Main View A.2.4.2. Toolkit Parameters A.2.4.3. Channel Parameters A.2.4.4. Eye Viewer
A.2.4.2. Toolkit Parameters x
A.2.4.2.1. Agilex™ 5 Information A.2.4.2.2. Event Counter A.2.4.2.3. P0 Configuration Space
A.2.4.3. Channel Parameters x
A.2.4.3.1. General PHY A.2.4.3.2. TX Path A.2.4.3.3. RX Path
1. Introduction
2. Features
3. Getting Started with GTS AXI Streaming IP
4. IP Architecture and Functional Description
5. IP Parameters for E-Series FPGA
6. IP Parameters for D-Series FPGAs
7. Interfaces and Signals
8. Registers
9. Document Revision History for the GTS AXI Streaming Intel® FPGA IP for PCI Express* User Guide
A. Troubleshooting/Debugging
B. PIPE Mode Simulation

7.5. Control Shadow Interface

The control shadow interface brings out the settings of the various configuration register fields of the function. These fields are mandatory to design the control path of the application layer logic.

The application logic decodes information provided on this interface to create a shadow copy. The interface provides update to primary control signals only. The application logic must read extra information required through the AXI4-Lite Control and Status Register Responder interface by reading configuration register of interest.

Table 45.  Control Shadow Interface—Available Settings of Various Configuration Register Fields
Function Description
Bus Master Enable
  • The application logic requires the BME information to determine if it can generate request for a particular function.
  • Each function in the application logic cannot generate bus master requests unless its corresponding BME is set.
  • The application logic monitors control shadow interface for BME event for this purpose.
  • Since the GTS AXI Streaming IP does not autonomously generate bus master request by itself, it does not qualify the transmit path with BME settings and solely relies on application.
MSI-X Mask
  • It is the Function Mask bit, indicate that all of the vectors associated with the Function are masked when set, regardless of their per-vector Mask bit values.
  • Each vector's Mask bit determines whether the vector is masked or not when this bit is clear.
MSI-X Enable
  • The application logic requires MSI-X Address and MSI-X Data information from MSI-X capability to generate the MSI-X interrupt.
  • The application logic monitors control shadow interface for MSI-X Enable event to read these additional information from MSI-X capability.
MemSpace Enable
  • It controls a Function's response to Memory Space accesses.
  • When this bit is Clear, all received Memory Space accesses are caused to be handled as Unsupported Requests.
  • When this bit is set, the Function is enabled to decode the address and further process Memory Space accesses.
  • For a Function with a Type 1 Configuration Space header, this bit controls the response to the Memory Space accesses received on its Primary Side.
ExpRom Enable It indicates whether or not the Function accepts accesses to its expansion ROM. When this bit is 0b, the Function's expansion ROM address space is disabled. When the bit is 1b, the address decoding is enabled using the parameters in the other part of the Expansion ROM Base Address register.
TPH Req Enable
  • The function supports all operational modes of TPH, no ST mode, interrupt vector mode or device specific mode.
  • The HOST communicates mode of operation by writing ST Mode Select bits in TPH requester control register.
  • The application reads this register and generates traffic only when TPH requester enable bit is set.
ATS Enable
  • The function can read Smallest Translation Unit (STU) field from ATS control register when ATS enable bit is set.
  • The following figure shows output on the Control Shadow interface when there is an update to the control shadow bits in the HIP configuration register.
MSI Enable
  • The application logic requires MSI Address and MSI Data information from MSI capability to generate MSI interrupt.
  • The application logic monitors control shadow interface for MSI Enable event to read this additional information from MSI capability.
MSI Mask It indicates the Function supports MSI Per-Vector Masking when set and not supported when clear.
Extended Tag It indicates 8-bit Tag field generation is enabled when set and 5-bit Tag field generation when clear.
10bit Tag Req Enable It indicates that the Requester is permitted to use 10-Bit Tags when set, not permitted when clear.
PTM Enable It indicates that a Function is permitted to participate in the PTM mechanism according to its selected roles when set and not permitted when it is cleared.
Maximum Payload Size (MPS)
The defined encodings are:
  • 000b: 128 bytes max payload size
  • 001b: 256 bytes max payload size
  • 010b: 512 bytes max payload size
  • 011b: 1024 bytes max payload size
  • 100b: 2048 bytes max payload size
  • 101b: 4096 bytes max payload size
  • 110b: Reserved
  • 111b: Reserved
Maximum Read Request Size (MRRS)
The defined encodings are:
  • 000b: 128 bytes maximum Read Request size
  • 001b: 256 bytes maximum Read Request size
  • 010b: 512 bytes maximum Read Request size
  • 011b: 1024 bytes maximum Read Request size
  • 100b: 2048 bytes maximum Read Request size
  • 101b: 4096 bytes maximum Read Request size
  • 110b: Reserved
  • 111b: Reserved
Virtual Function (VF) Enable
  • The Virtual Function in application logic cannot generate any traffic unless they are enabled by HOST. The number of VFs enabled can be different than the number of VFs advertised as initial VFs.
  • The application logic can find the number of VFs visible by reading the NumVFs register in the SR-IOV capability.
  • The read of this register must be triggered after the VF Enable bit is set by HOST.
  • It indicates that VFs associated with PF are accessible in the PCI Express* fabric when set.
  • VFs are disabled and not visible in the PCI Express* fabric when clear.
Page Request Enable It indicates that the Page Request Interface is allowed to make page requests when set, not allowed when clear.
Figure 56. Control Shadow Interface Timing Diagram During an Update
Table 46.  Control Shadow Interface Signalsn = 0 or 1, p0 = port 0, and p1 = port 1
Note: Port 1 is only available in D-Series FPGAs
Signal Name Direction Clock Domain Description
p<n>_ss_app_st_ctrlshadow_tvalid Output p<n>_axi_lite_clk

The GTS AXI Streaming IP asserts this output for one clock cycle when there is an update to the register fields being monitored, because of a Configuration Write performed by the root complex.

You can copy the new settings of the register fields from the p<n>_ss_app_st_ctrlshadow_tdata[39:0] bus.

p<n>_ss_app_st_ctrlshadow_tdata[39:0] Output p<n>_axi_lite_clk

When p<n>_ss_app_st_ctrlshadow_tvalid has been asserted, this output provides the current settings of the register fields of the associated Function.

  • Bit [2:0]: Identifies the physical function number of configuration register.
  • Bit [13:3]: Identifies the virtual function number of configuration register.
  • Bit [14]: Indicates information is for virtual function implemented in slot's physical function.
  • Bit [19:15]: Identifies the slot number of configuration register.
  • Bit [20]: Bus Master Enable
  • Bit [21]: MSI-X Mask
  • Bit [22]: MSI-X Enable
  • Bit [23]: MemSpace Enable
  • Bit [24]: ExpRom Enable
  • Bit [25]: TPH Req Enable
  • Bit [26]: ATS Enable
  • Bit [27]: MSI Enable
  • Bit [28]: MSI Mask
  • Bit [29]: Extended Tag
  • Bit [30]: 10Bit Tag Req Enable
  • Bit [31]: PTM Enable
  • Bit [34:32]: MPS
  • Bit [37:35]: MRRS
  • Bit [38]: VF Enable
  • Bit [39]: Page Request Enable
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