Stratix V Avalon-ST Interface for PCIe Solutions: User Guide

Download PDF
ID 683093
Date 5/03/2019
Public
Document Table of Contents
Document Table of Contents x
1. Datasheet 2. Getting Started with the Stratix V Hard IP for PCI Express 3. Getting Started with the Configuration Space Bypass Mode Qsys Example Design 4. Parameter Settings 5. Interfaces and Signal Descriptions 6. Registers 7. Interrupts 8. Error Handling 9. PCI Express Protocol Stack 10. Transaction Layer Protocol (TLP) Details 11. Throughput Optimization 12. Design Implementation 13. Additional Features 14. Hard IP Reconfiguration 15. Transceiver PHY IP Reconfiguration 16. Testbench and Design Example 17. Debugging A. Frequently Asked Questions for PCI Express B. Lane Initialization and Reversal C. Document Revision History
1. Datasheet x
1.1. Stratix V Avalon-ST Interface for PCIe Datasheet 1.2. Release Information 1.3. Device Family Support 1.4. Configurations 1.5. Avalon-ST Example Designs 1.6. Debug Features 1.7. IP Core Verification 1.8. Resource Utilization 1.9. Recommended Speed Grades 1.10. Creating a Design for PCI Express
1.1. Stratix V Avalon-ST Interface for PCIe Datasheet x
1.1.1. Features
1.7. IP Core Verification x
1.7.1. Compatibility Testing Environment
2. Getting Started with the Stratix V Hard IP for PCI Express x
2.1. Qsys Design Flow
2.1. Qsys Design Flow x
2.1.1. Generating the Testbench 2.1.2. Simulating the Example Design 2.1.3. Generating Synthesis Files 2.1.4. Understanding the Files Generated 2.1.5. Understanding Simulation Log File Generation 2.1.6. Understanding Physical Placement of the PCIe IP Core 2.1.7. Compiling the Design in the Qsys Design Flow 2.1.8. Modifying the Example Design 2.1.9. Using the IP Catalog To Generate Your Stratix V Hard IP for PCI Express as a Separate Component
3. Getting Started with the Configuration Space Bypass Mode Qsys Example Design x
3.1. Copying the Configuration Space Bypass Mode Example Design 3.2. Generating the Qsys System 3.3. Simulating the Example Design
3.2. Generating the Qsys System x
3.2.1. Generating Synthesis Files 3.2.2. Understanding the Generated Files 3.2.3. Understanding Simulation Log File Generation
3.3. Simulating the Example Design x
3.3.1. Timing for Configuration Read to Function 0 for the 256-Bit Avalon-ST Interface 3.3.2. Timing for Configuration Write to Function 0 for the 256-Bit Avalon-ST Interface 3.3.3. Timing for Memory Write and Read of Function 1 256-Bit Avalon-ST Interface 3.3.4. Partial Transcript for Configuration Space Bypass Simulation
4. Parameter Settings x
4.1. System Settings 4.2. Base Address Register (BAR) and Expansion ROM Settings 4.3. Base and Limit Registers for Root Ports 4.4. Device Identification Registers 4.5. PCI Express and PCI Capabilities Parameters 4.6. Vendor Specific Extended Capability (VSEC) 4.7. PHY Characteristics
4.5. PCI Express and PCI Capabilities Parameters x
4.5.1. PCI Express and PCI Capabilities 4.5.2. Error Reporting 4.5.3. Link Capabilities 4.5.4. MSI and MSI-X Capabilities 4.5.5. Slot Capabilities 4.5.6. Power Management
5. Interfaces and Signal Descriptions x
5.1. Clock Signals 5.2. Reset, Status, and Link Training Signals 5.3. ECRC Forwarding 5.4. Error Signals 5.5. Interrupts for Endpoints 5.6. Interrupts for Root Ports 5.7. Completion Side Band Signals 5.8. Configuration Space Bypass Mode Interface Signals 5.9. Parity Signals 5.10. LMI Signals 5.11. Transaction Layer Configuration Space Signals 5.12. Hard IP Reconfiguration Interface 5.13. Power Management Signals 5.14. Physical Layer Interface Signals
5.11. Transaction Layer Configuration Space Signals x
5.11.1. Configuration Space Register Access Timing 5.11.2. Configuration Space Register Access
5.14. Physical Layer Interface Signals x
5.14.1. Transceiver Reconfiguration 5.14.2. Serial Data Signals 5.14.3. PIPE Interface Signals 5.14.4. Test Signals
5.14.2. Serial Data Signals x
5.14.2.1. Physical Layout of Hard IP in Stratix V GX/GT/GS Devices 5.14.2.2. Channel Placement in Arria V GZ and Stratix V GX/GT/GS Devices
6. Registers x
6.1. Correspondence between Configuration Space Registers and the PCIe Specification 6.2. Type 0 Configuration Space Registers 6.3. Type 1 Configuration Space Registers 6.4. PCI Express Capability Structures 6.5. Intel-Defined VSEC Registers 6.6. CvP Registers 6.7. Uncorrectable Internal Error Mask Register 6.8. Uncorrectable Internal Error Status Register 6.9. Correctable Internal Error Mask Register 6.10. Correctable Internal Error Status Register
7. Interrupts x
7.1. Interrupts for Endpoints 7.2. Interrupts for Root Ports
7.1. Interrupts for Endpoints x
7.1.1. MSI and Legacy Interrupts 7.1.2. MSI-X 7.1.3. Implementing MSI-X Interrupts 7.1.4. Legacy Interrupts
8. Error Handling x
8.1. Physical Layer Errors 8.2. Data Link Layer Errors 8.3. Transaction Layer Errors 8.4. Error Reporting and Data Poisoning 8.5. Uncorrectable and Correctable Error Status Bits
9. PCI Express Protocol Stack x
9.1. Top-Level Interfaces 9.2. Transaction Layer 9.3. Data Link Layer 9.4. Physical Layer
9.1. Top-Level Interfaces x
9.1.1. Avalon-ST Interface 9.1.2. Clocks and Reset 9.1.3. Local Management Interface (LMI Interface) 9.1.4. Hard IP Reconfiguration 9.1.5. Transceiver Reconfiguration 9.1.6. Interrupts 9.1.7. PIPE
9.2. Transaction Layer x
9.2.1. Configuration Space 9.2.2. Configuration Space Bypass Mode
10. Transaction Layer Protocol (TLP) Details x
10.1. Supported Message Types 10.2. Transaction Layer Routing Rules 10.3. Receive Buffer Reordering
10.1. Supported Message Types x
10.1.1. INTX Messages 10.1.2. Power Management Messages 10.1.3. Error Signaling Messages 10.1.4. Locked Transaction Message 10.1.5. Slot Power Limit Message 10.1.6. Vendor-Defined Messages 10.1.7. Hot Plug Messages
10.3. Receive Buffer Reordering x
10.3.1. Using Relaxed Ordering
11. Throughput Optimization x
11.1. Throughput of Posted Writes 11.2. Throughput of Non-Posted Reads
12. Design Implementation x
12.1. Making Analog QSF Assignments Using the Assignment Editor 12.2. Making Pin Assignments to Assign I/O Standard to Serial Data Pins 12.3. Recommended Reset Sequence to Avoid Link Training Issues 12.4. SDC Timing Constraints
13. Additional Features x
13.1. Configuration over Protocol (CvP) 13.2. Autonomous Mode 13.3. ECRC
13.2. Autonomous Mode x
13.2.1. Enabling Autonomous Mode 13.2.2. Enabling CvP Initialization
13.3. ECRC x
13.3.1. ECRC on the RX Path 13.3.2. ECRC on the TX Path
15. Transceiver PHY IP Reconfiguration x
15.1. Connecting the Transceiver Reconfiguration Controller IP Core 15.2. Transceiver Reconfiguration Controller Connectivity for Designs Using CvP
16. Testbench and Design Example x
16.1. Endpoint Testbench 16.2. Root Port Testbench 16.3. Test Driver Module 16.4. Root Port Design Example 16.5. Root Port BFM Overview 16.6. BFM Procedures and Functions 16.7. Setting Up Simulation
16.1. Endpoint Testbench x
16.1.1. Endpoint Testbench for SR-IOV
16.5. Root Port BFM Overview x
16.5.1. BFM Memory Map 16.5.2. Configuration Space Bus and Device Numbering 16.5.3. Configuration of Root Port and Endpoint 16.5.4. Issuing Read and Write Transactions to the Application Layer
16.6. BFM Procedures and Functions x
16.6.1. ebfm_barwr Procedure 16.6.2. ebfm_barwr_imm Procedure 16.6.3. ebfm_barrd_wait Procedure 16.6.4. ebfm_barrd_nowt Procedure 16.6.5. ebfm_cfgwr_imm_wait Procedure 16.6.6. ebfm_cfgwr_imm_nowt Procedure 16.6.7. ebfm_cfgrd_wait Procedure 16.6.8. ebfm_cfgrd_nowt Procedure 16.6.9. BFM Configuration Procedures 16.6.10. BFM Shared Memory Access Procedures 16.6.11. BFM Log and Message Procedures 16.6.12. Verilog HDL Formatting Functions
16.6.9. BFM Configuration Procedures x
16.6.9.1. ebfm_cfg_rp_ep Procedure 16.6.9.2. ebfm_cfg_decode_bar Procedure
16.6.10. BFM Shared Memory Access Procedures x
16.6.10.1. Shared Memory Constants 16.6.10.2. shmem_write Task 16.6.10.3. shmem_read Function 16.6.10.4. shmem_display Verilog HDL Function 16.6.10.5. shmem_fill Procedure 16.6.10.6. shmem_chk_ok Function
16.6.11. BFM Log and Message Procedures x
16.6.11.1. ebfm_display Verilog HDL Function 16.6.11.2. ebfm_log_stop_sim Verilog HDL Function 16.6.11.3. ebfm_log_set_suppressed_msg_mask Task 16.6.11.4. ebfm_log_set_stop_on_msg_mask Verilog HDL Task 16.6.11.5. ebfm_log_open Verilog HDL Function 16.6.11.6. ebfm_log_close Verilog HDL Function
16.6.12. Verilog HDL Formatting Functions x
16.6.12.1. himage1 16.6.12.2. himage2 16.6.12.3. himage4 16.6.12.4. himage8 16.6.12.5. himage16 16.6.12.6. dimage1 16.6.12.7. dimage2 16.6.12.8. dimage3 16.6.12.9. dimage4 16.6.12.10. dimage5 16.6.12.11. dimage6 16.6.12.12. dimage7
16.7. Setting Up Simulation x
16.7.1. Changing Between Serial and PIPE Simulation 16.7.2. Using the PIPE Interface for Gen1 and Gen2 Variants 16.7.3. Viewing the Important PIPE Interface Signals 16.7.4. Disabling the Scrambler for Gen1 and Gen2 Simulations 16.7.5. Disabling 8B/10B Encoding and Decoding for Gen1 and Gen2 Simulations 16.7.6. Changing between the Hard and Soft Reset Controller
17. Debugging x
17.1. Hardware Bring-Up Issues 17.2. Link Training 17.3. Use Third-Party PCIe Analyzer 17.4. BIOS Enumeration Issues
17.2. Link Training x
17.2.1. Debugging Link that Fails To Reach L0 17.2.2. Link Hangs in L0 State
C. Document Revision History x
C.1. Document Revision History Stratix V Avalon® -ST Interface for PCIe* Solutions User Guide
1. Datasheet
2. Getting Started with the Stratix V Hard IP for PCI Express
3. Getting Started with the Configuration Space Bypass Mode Qsys Example Design
4. Parameter Settings
5. Interfaces and Signal Descriptions
6. Registers
7. Interrupts
8. Error Handling
9. PCI Express Protocol Stack
10. Transaction Layer Protocol (TLP) Details
11. Throughput Optimization
12. Design Implementation
13. Additional Features
14. Hard IP Reconfiguration
15. Transceiver PHY IP Reconfiguration
16. Testbench and Design Example
17. Debugging
A. Frequently Asked Questions for PCI Express
B. Lane Initialization and Reversal
C. Document Revision History

5.2. Reset, Status, and Link Training Signals

Refer to Reset and Clocks for more information about the reset sequence and a block diagram of the reset logic.

Table 25.  Reset Signals

Signal

Direction

Description

npor

Input

Active low reset signal. In the Intel hardware example designs, npor is the OR of pin_perst and local_rstn coming from the software Application Layer. If you do not drive a soft reset signal from the Application Layer, this signal must be derived from pin_perst. You cannot disable this signal. Resets the entire IP Core and transceiver. Asynchronous.

In systems that use the hard reset controller, this signal is edge, not level sensitive; consequently, you cannot use a low value on this signal to hold custom logic in reset. For more information about the hard and soft reset controllers, refer to Reset.

clr_st Output This optional reset signal has the same effect as reset_status. You enable this signal by turning On the Enable Avalon-ST reset output port in the parameter editor.
reset_status

Output

Active high reset status signal. When asserted, this signal indicates that the Hard IP clock is in reset. The reset_status signal is synchronous to the pld_clk clock and is deasserted only when the npor is deasserted and the Hard IP for PCI Express is not in reset (reset_status_hip = 0). You should use reset_status to drive the reset of your application. This reset is used for the Hard IP for PCI Express IP Core with the Avalon-ST interface.

pin_perst

Input

Active low reset from the PCIe reset pin of the device. pin_perst resets the datapath and control registers. Configuration over PCI Express (CvP) requires this signal. For more information about CvP refer to Configuration over PCI Express (CvP).

Stratix® V devices can have up to 4 instances of the Hard IP for PCI Express. Each instance has its own pin_perst signal. You must connect the pin_perst of each Hard IP instance to the corresponding nPERST pin of the device. These pins have the following locations:

  • NPERSTL0: bottom left Hard IP and CvP blocks
  • NPERSTL1: top left Hard IP block
  • NPERSTR0: bottom right Hard IP block
  • NPERSTR1: top right Hard IP block

For example, if you are using the Hard IP instance in the bottom left corner of the device, you must connect pin_perst to NPERSL0.

For maximum use of the Stratix® V device, Intel recommends that you use the bottom left Hard IP first. This is the only location that supports CvP over a PCIe link. If your design does not require CvP, you may select other Hard IP blocks.

Refer to the appropriate device pinout for correct pin assignment for more detailed information about these pins. The PCI Express Card Electromechanical Specification 2.0 specifies this pin requires 3.3 V. You can drive this 3.3V signal to the nPERST* even if the VVCCPGM of the bank is not 3.3V if the following 2 conditions are met:

  • The input signal meets the VIH and VIL specification for LVTTL.

  • The input signal meets the overshoot specification for 100°C operation as specified by the “Maximum Allowed Overshoot and Undershoot Voltage” section in volume 3 of the Stratix V Device Handbook.

Figure 17. Reset and Link Training Timing Relationships

The following figure illustrates the timing relationship between npor and the LTSSM L0 state.

Note: To meet the 100 ms system configuration time, you must use the fast passive parallel configuration scheme with CvP and a 32-bit data width (FPP x32) or use the Stratix® V Hard IP for PCI Express in autonomous mode.
Table 26.  Status and Link Training Signals

Signal

Direction

Description

serdes_pll_locked

Output

When asserted, indicates that the PLL that generates the coreclkout_hip clock signal is locked. In pipe simulation mode this signal is always asserted.

pld_core_ready

Input

When asserted, indicates that the Application Layer is ready for operation and is providing a stable clock to the pld_clk input. If the coreclkout_hip Hard IP output clock is sourcing the pld_clk Hard IP input, this input can be connected to the serdes_pll_locked output.

pld_clk_inuse

Output

When asserted, indicates that the Hard IP Transaction Layer is using the pld_clk as its clock and is ready for operation with the Application Layer. For reliable operation, hold the Application Layer in reset until pld_clk_inuse is asserted.

dlup

Output

When asserted, indicates that the Hard IP block is in the Data Link Control and Management State Machine (DLCMSM) DL_Up state.

dlup_exit

Output

This signal is asserted low for one pld_clk cycle when the IP core exits the DLCMSM DL_Up state, indicating that the Data Link Layer has lost communication with the other end of the PCIe link and left the Up state. When this pulse is asserted, the Application Layer should generate an internal reset signal that is asserted for at least 32 cycles.

ev128ns

Output

Asserted every 128 ns to create a time base aligned activity.

ev1us

Output

Asserted every 1µs to create a time base aligned activity.

hotrst_exit

Output

Hot reset exit. This signal is asserted for 1 clock cycle when the LTSSM exits the hot reset state. This signal should cause the Application Layer to be reset. This signal is active low. When this pulse is asserted, the Application Layer should generate an internal reset signal that is asserted for at least 32 cycles.

l2_exit

Output

L2 exit. This signal is active low and otherwise remains high. It is asserted for one cycle (changing value from 1 to 0 and back to 1) after the LTSSM transitions from l2.idle to detect. When this pulse is asserted, the Application Layer should generate an internal reset signal that is asserted for at least 32 cycles.

lane_act[3:0]

Output

Lane Active Mode: This signal indicates the number of lanes that configured during link training. The following encodings are defined:

  • 4’b0001: 1 lane
  • 4’b0010: 2 lanes
  • 4’b0100: 4 lanes
  • 4’b1000: 8 lanes
currentspeed[1:0]

Output

Indicates the current speed of the PCIe link. The following encodings are defined:

  • 2b’00: Undefined
  • 2b’01: Gen1
  • 2b’10: Gen2
  • 2b’11: Gen3
ltssmstate[4:0]

Output

LTSSM state: The LTSSM state machine encoding defines the following states:

  • 00000: Detect.Quiet
  • 00001: Detect.Active
  • 00010: Polling.Active
  • 00011: Polling.Compliance
  • 00100: Polling.Configuration
  • 00101: Polling.Speed
  • 00110: config.Linkwidthstart
  • 00111: Config.Linkaccept
  • 01000: Config.Lanenumaccept
  • 01001: Config.Lanenumwait
  • 01010: Config.Complete
  • 01011: Config.Idle
  • 01100: Recovery.Rcvlock
  • 01101: Recovery.Rcvconfig
  • 01110: Recovery.Idle
  • 01111: L0
  • 10000: Disable
  • 10001: Loopback.Entry
  • 10010: Loopback.Active
  • 10011: Loopback.Exit
  • 10100: Hot.Reset
  • 10101: LOs
  • 11001: L2.transmit.Wake
  • 11010: Recovery.Speed
  • 11011: Recovery.Equalization, Phase 0
  • 11100: Recovery.Equalization, Phase 1
  • 11101: Recovery.Equalization, Phase 2
  • 11110: Recovery.Equalization, Phase 3
  • 11111: Recovery.Equalization, Done
Related Information
Level Two Title