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

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ID 683059
Date 4/04/2024
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Document Table of Contents
Document Table of Contents x
1. About the P-tile Avalon® Intel® FPGA IPs for PCI Express 2. IP Architecture and Functional Description 3. Advanced Features 4. Interfaces 5. Parameters 6. Testbench 7. Troubleshooting/Debugging 8. P-tile Avalon® Streaming Intel FPGA IP for PCI Express* User Guide Archives 9. Document Revision History for the P-Tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide A. Configuration Space Registers B. Root Port Enumeration C. Implementation of Address Translation Services (ATS) in Endpoint Mode D. Packets Forwarded to the User Application in TLP Bypass Mode E. Using the Avery BFM for Intel P-Tile PCI Express Gen4 x16 Simulations F. Bifurcated Endpoint Support for Independent Warm Resets G. Margin Masks for the P-Tile Avalon Streaming Intel FPGA IP for PCI Express
1. About the P-tile Avalon® Intel® FPGA IPs for PCI Express x
1.1. Overview 1.2. Features 1.3. Release Information 1.4. Device Family Support 1.5. Performance and Resource Utilization 1.6. IP Core and Design Example Support Levels
1.1. Overview x
1.1.1. Standards and Specifications Compliance
2. IP Architecture and Functional Description x
2.1. Architecture 2.2. Functional Description
2.1. Architecture x
2.1.1. Clock Domains 2.1.2. Refclk 2.1.3. Reset
2.1.3. Reset x
2.1.3.1. Independent PERST
2.2. Functional Description x
2.2.1. PMA/PCS 2.2.2. Data Link Layer Overview 2.2.3. Transaction Layer Overview
3. Advanced Features x
3.1. PCIe* Port Bifurcation and PHY Channel Mapping 3.2. Virtualization Support 3.3. TLP Bypass Mode
3.2. Virtualization Support x
3.2.1. SR-IOV Support 3.2.2. VirtIO Support
3.2.1. SR-IOV Support x
3.2.1.1. SR-IOV Supported Features List 3.2.1.2. Implementation 3.2.1.3. VF to PF Mapping 3.2.1.4. Function Level Reset (FLR)
3.2.1.2. Implementation x
3.2.1.2.1. VF Error Flag Interface (for x16/x8 Cores Only)
3.2.2. VirtIO Support x
3.2.2.1. VirtIO Supported Features List 3.2.2.2. Overview 3.2.2.3. Parameters 3.2.2.4. VirtIO PCI Configuration Access Interface 3.2.2.5. Registers
3.2.2.5. Registers x
3.2.2.5.1. VirtIO Common Configuration Capability Register (Address: 0x012) 3.2.2.5.2. VirtIO Common Configuration BAR Indicator Register (Address: 0x013) 3.2.2.5.3. VirtIO Common Configuration BAR Offset Register (Address: 0x014) 3.2.2.5.4. VirtIO Common Configuration Structure Length Register (Address 0x015) 3.2.2.5.5. VirtIO Notifications Capability Register (Address: 0x016) 3.2.2.5.6. VirtIO Notifications BAR Indicator Register (Address: 0x017) 3.2.2.5.7. VirtIO Notifications BAR Offset Register (Address: 0x018) 3.2.2.5.8. VirtIO Notifications Structure Length Register (Address: 0x019) 3.2.2.5.9. VirtIO Notifications Notify Off Multiplier Register (Address: 0x01A) 3.2.2.5.10. VirtIO ISR Status Capability Register (Address: 0x02F) 3.2.2.5.11. VirtIO ISR Status BAR Indicator Register (Address: 0x030) 3.2.2.5.12. VirtIO ISR Status BAR Offset Register (Address: 0x031) 3.2.2.5.13. VirtIO ISR Status Structure Length Register (Address: 0x032) 3.2.2.5.14. VirtIO Device Specific Capability Register (Address: 0x033) 3.2.2.5.15. VirtIO Device Specific BAR Indicator Register (Address: 0x034) 3.2.2.5.16. VirtIO Device Specific BAR Offset Register (Address 0x035 ) 3.2.2.5.17. VirtIO Device Specific Structure Length Register (Address: 0x036) 3.2.2.5.18. VirtIO PCI Configuration Access Capability Register (Address: 0x037) 3.2.2.5.19. VirtIO PCI Configuration Access BAR Indicator Register (Address: 0x038) 3.2.2.5.20. VirtIO PCI Configuration Access BAR Offset Register (Address: 0x039) 3.2.2.5.21. VirtIO PCI Configuration Access Structure Length Register (Address: 0x03A) 3.2.2.5.22. VirtIO PCI Configuration Access Data Register (Address: 0x03B)
3.3. TLP Bypass Mode x
3.3.1. Overview 3.3.2. Register Settings for the TLP Bypass Mode 3.3.3. User Avalon® -MM Interface 3.3.4. Avalon® -ST Interface
3.3.2. Register Settings for the TLP Bypass Mode x
3.3.2.1. TLPBYPASS_ERR_EN (Address 0x104194) 3.3.2.2. TLPBYPASS_ERR_STATUS (Address 0x104190)
3.3.4. Avalon® -ST Interface x
3.3.4.1. Configuration TLP 3.3.4.2. Transmit Interface 3.3.4.3. Receive Interface 3.3.4.4. Malformed TLP 3.3.4.5. ECRC
4. Interfaces x
4.1. Overview 4.2. Clocks and Resets 4.3. Serial Data Interface 4.4. Avalon-ST Interface 4.5. Hard IP Status Interface 4.6. Interrupt Interface 4.7. Error Interface 4.8. Hot Plug Interface (RP Only) 4.9. Power Management Interface 4.10. Configuration Output Interface 4.11. Configuration Intercept Interface (EP Only) 4.12. Hard IP Reconfiguration Interface 4.13. PHY Reconfiguration Interface 4.14. Page Request Service (PRS) Interface (EP Only)
4.2. Clocks and Resets x
4.2.1. Interface Clock Signals 4.2.2. Resets
4.2.2. Resets x
4.2.2.1. Interface Reset Signals 4.2.2.2. Function-Level Reset (FLR) Interface (EP Only)
4.4. Avalon-ST Interface x
4.4.1. TLP Header and Data Alignment for the Avalon-ST RX and TX Interfaces 4.4.2. Avalon® -ST RX Interface 4.4.3. Avalon® -ST RX Interface rx_st_ready Behavior 4.4.4. RX Flow Control Interface 4.4.5. Avalon® -ST TX Interface 4.4.6. Avalon® -ST TX Interface tx_st_ready Behavior 4.4.7. TX Flow Control Interface 4.4.8. Tag Allocation
4.4.8. Tag Allocation x
4.4.8.1. Completion Buffer Size
4.6. Interrupt Interface x
4.6.1. Legacy Interrupts 4.6.2. MSI 4.6.3. MSI-X
4.6.3. MSI-X x
4.6.3.1. Implementing MSI-X Interrupts
4.7. Error Interface x
4.7.1. Completion Timeout Interface 4.7.2. VF Error Flags Interface
4.12. Hard IP Reconfiguration Interface x
4.12.1. Address Map for the User Avalon-MM Interface 4.12.2. Configuration Registers Access
4.12.1. Address Map for the User Avalon-MM Interface x
4.12.1.1. User Avalon-MM Control Register (Offset 0x104068)
4.12.2. Configuration Registers Access x
4.12.2.1. Using Direct User Avalon-MM Interface (Byte Access) 4.12.2.2. Using the Debug Register Interface Access (Dword Access)
5. Parameters x
5.1. Top-Level Settings 5.2. Core Parameters
5.2. Core Parameters x
5.2.1. Avalon® Parameters 5.2.2. Base Address Registers 5.2.3. PCI Express and PCI Capabilities Parameters 5.2.4. Device Identification Registers 5.2.5. Configuration, Debug and Extension Options
5.2.3. PCI Express and PCI Capabilities Parameters x
5.2.3.1. Device Capabilities 5.2.3.2. VirtIO Parameters 5.2.3.3. Link Capabilities 5.2.3.4. Legacy Interrupt Pin Register 5.2.3.5. MSI Capabilities 5.2.3.6. MSI-X Capabilities 5.2.3.7. Slot Capabilities 5.2.3.8. Latency Tolerance Reporting (LTR) 5.2.3.9. Process Address Space ID (PASID) 5.2.3.10. Device Serial Number Capability 5.2.3.11. Page Request Service (PRS) 5.2.3.12. Access Control Service (ACS) Capabilities 5.2.3.13. Power Management 5.2.3.14. Vendor Specific Extended Capability (VSEC) Registers 5.2.3.15. TLP Processing Hints (TPH) 5.2.3.16. Address Translation Services (ATS) Capabilities
5.2.3.1. Device Capabilities x
5.2.3.1.1. Multifunction and SR-IOV System Parameters
6. Testbench x
6.1. Endpoint Testbench 6.2. Test Driver Module 6.3. Root Port BFM
6.3. Root Port BFM x
6.3.1. BFM Memory Map 6.3.2. Configuration Space Bus and Device Numbering 6.3.3. Configuration of Root Port and Endpoint 6.3.4. Issuing Read and Write Transactions to the Application Layer 6.3.5. BFM Procedures and Functions
6.3.5. BFM Procedures and Functions x
6.3.5.1. ebfm_barwr Procedure 6.3.5.2. ebfm_barwr_imm Procedure 6.3.5.3. ebfm_barrd_wait Procedure 6.3.5.4. ebfm_barrd_nowt Procedure 6.3.5.5. ebfm_cfgwr_imm_wait Procedure 6.3.5.6. ebfm_cfgwr_imm_nowt Procedure 6.3.5.7. ebfm_cfgrd_wait Procedure 6.3.5.8. ebfm_cfgrd_nowt Procedure 6.3.5.9. BFM Configuration Procedures 6.3.5.10. BFM Shared Memory Access Procedures 6.3.5.11. BFM Log and Message Procedures 6.3.5.12. Verilog HDL Formatting Functions
6.3.5.9. BFM Configuration Procedures x
6.3.5.9.1. ebfm_cfg_rp_ep Procedure 6.3.5.9.2. ebfm_cfg_decode_bar Procedure
6.3.5.10. BFM Shared Memory Access Procedures x
6.3.5.10.1. Shared Memory Constants 6.3.5.10.2. shmem_write Task 6.3.5.10.3. shmem_read Function 6.3.5.10.4. shmem_display Verilog HDL Function 6.3.5.10.5. shmem_fill Procedure 6.3.5.10.6. shmem_chk_ok Function
6.3.5.11. BFM Log and Message Procedures x
6.3.5.11.1. ebfm_display Verilog HDL Function 6.3.5.11.2. ebfm_log_stop_sim Verilog HDL Function 6.3.5.11.3. ebfm_log_set_suppressed_msg_mask Task 6.3.5.11.4. ebfm_log_set_stop_on_msg_mask Verilog HDL Task 6.3.5.11.5. ebfm_log_open Verilog HDL Function 6.3.5.11.6. ebfm_log_close Verilog HDL Function
6.3.5.12. Verilog HDL Formatting Functions x
6.3.5.12.1. himage1 6.3.5.12.2. himage2 6.3.5.12.3. himage4 6.3.5.12.4. himage8 6.3.5.12.5. himage16 6.3.5.12.6. dimage1 6.3.5.12.7. dimage2 6.3.5.12.8. dimage3 6.3.5.12.9. dimage4 6.3.5.12.10. dimage5 6.3.5.12.11. dimage6 6.3.5.12.12. dimage7
7. Troubleshooting/Debugging x
7.1. Hardware 7.2. Debug Toolkit
7.1. Hardware x
7.1.1. Debugging Link Training Issues 7.1.2. Debugging Data Transfer and Performance Issues
7.1.1. Debugging Link Training Issues x
7.1.1.1. Generic Tools and Utilities 7.1.1.2. Signal Tap II Logic Analyzer 7.1.1.3. Additional Debug Tools
7.1.2. Debugging Data Transfer and Performance Issues x
7.1.2.1. Advanced Error Reporting (AER) 7.1.2.2. Second-Level Debug Tools
7.2. Debug Toolkit x
7.2.1. Overview 7.2.2. Enabling the P-Tile Debug Toolkit 7.2.3. Launching the P-Tile Debug Toolkit 7.2.4. Using the P-Tile Debug Toolkit 7.2.5. Using the P-Tile Link Inspector
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)
C. Implementation of Address Translation Services (ATS) in Endpoint Mode x
C.1. Sending Translated/Untranslated Requests C.2. Sending a Page Request Message from the Endpoint (EP) to the Root Complex (RC) C.3. Invalidating Requests/Completions
D. Packets Forwarded to the User Application in TLP Bypass Mode x
D.1. EP TLP Bypass Mode (Upstream) D.2. RC TLP Bypass Mode (Downstream)
E. Using the Avery BFM for Intel P-Tile PCI Express Gen4 x16 Simulations x
E.1. Overview E.2. Generate the PCIe PIO Example Design E.3. Integrate Avery BFMs (Root Complex) E.4. Configure the Avery BFM and Update the Simulation Script E.5. Compile and Simulate E.6. View the Results
E.2. Generate the PCIe PIO Example Design x
E.2.1. Avalon® -ST PCIe PIO Example Design
F. Bifurcated Endpoint Support for Independent Warm Resets x
F.1. PCI Express Resets F.2. P-tile PCIe Design Constraints
F.2. P-tile PCIe Design Constraints x
F.2.1. P-tile Dual-Endpoint System Configurations
G. Margin Masks for the P-Tile Avalon Streaming Intel FPGA IP for PCI Express x
G.1. Margin Masks Overview G.2. Nx5 Testing Efficiency G.3. Debug Toolkit Margin Methodology
G.2. Nx5 Testing Efficiency x
G.2.1. First Time Testing G.2.2. Spot Check Testing
G.3. Debug Toolkit Margin Methodology x
G.3.1. Debug Toolkit (DTK) Testing Process G.3.2. DTK Margin Evaluation Based on Margin Mask Values
1. About the P-tile Avalon® Intel® FPGA IPs for PCI Express
2. IP Architecture and Functional Description
3. Advanced Features
4. Interfaces
5. Parameters
6. Testbench
7. Troubleshooting/Debugging
8. P-tile Avalon® Streaming Intel FPGA IP for PCI Express* User Guide Archives
9. Document Revision History for the P-Tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide
A. Configuration Space Registers
B. Root Port Enumeration
C. Implementation of Address Translation Services (ATS) in Endpoint Mode
D. Packets Forwarded to the User Application in TLP Bypass Mode
E. Using the Avery BFM for Intel P-Tile PCI Express Gen4 x16 Simulations
F. Bifurcated Endpoint Support for Independent Warm Resets
G. Margin Masks for the P-Tile Avalon Streaming Intel FPGA IP for PCI Express

4.4.5. Avalon® -ST TX Interface

The Application Layer transfers data to the Transaction Layer of the PCI Express* IP core over the Avalon® -ST TX interface. The Transaction Layer must assert tx_st_ready_o before transmission begins. Transmission of a packet must be uninterrupted when tx_st_ready_o is asserted.

The x16 interface supports multiple TLPs per cycle when an end-of-packet cycle occurs in the lower 256 bits. The 512-bit interface supports two locations for the beginning of a TLP, bit[0] and bit[256]. This means two TLPs can happen when an end-of-packet occurs in the lower 256 bits. Refer to Avalon® -ST TX Packet Interface in 1x16 Mode.

Note: This interface supports two tx_st_sop_i signals and two tx_st_eop_i signals per cycle when the P-Tile IP is operating in a 1x16 configuration. It also does not follow a fixed latency between the tx_st_ready_o and tx_st_valid_i[1:0] signals. Data can be received any time within the defined readyLatency, which is three coreclkout_hip cycles.

The x16 core provides two segments with each one having 256 bits of data (tx_st_data_i[511:256] and tx_st_data_i[255:0]), 128 bits of header (tx_st_hdr_i[255:128] and tx_st_hdr_i[127:0]), and 32 bits of TLP prefix (tx_st_tlp_prfx_i[63:32] and tx_st_tlp_prfx_i[31:0]). If this core is configured in the 1x16 mode, both segments are used, so the data bus becomes a 512-bit bus tx_st_data_i[511:0]. The start of packet can appear in the upper segment or lower segment, as indicated by the tx_st_sop_i[1:0] signals.

Note: To achieve the expected performance in Gen4 x16 mode, the user application needs to take advantage of this segmented bus architecture. Otherwise, some performance reduction may occur.

If this core is configured in the 2x8 or 1x8 modes, only the lower segment is used. In this case, the data bus is a 256-bit bus tx_st_data_i[255:0].

Finally, if this core is configured in the 4x4 mode, only the lower segment is used and only the LSB 128 bits of data are valid. In this case, the data bus is a 128-bit bus tx_st_data_i[127:0].

The x8 core provides one segment with 256 bits of data, 128 bits of header and 32 bits of TLP prefix. If this core is configured in 4x4 mode, only the LSB 128 bits of data are used.

The x4 core provides one segment with 128 bits of data, 128 bits of header and 32 bits of TLP prefix.

Table 56.   Avalon® -ST TX Interface
Signal Name Direction Description Clock Domain EP/RP/BP

x16: tx_st_data_i[511:0]

x8: tx_st_data_i[255:0]

x16: tx_st_data_i[127:0]

I

Application Layer data for transmission. The Application Layer must provide a properly formatted TLP on the TX interface. Valid when the corresponding tx_st_valid_i signal is asserted.

The mapping of message TLPs is the same as the mapping of Transaction Layer TLPs with 4-dword headers. The number of data cycles must be correct for the length and address fields in the header. Issuing a packet with an incorrect number of data cycles results in the TX interface hanging and becoming unable to accept further requests.

Note: There must be no Idle cycle between the tx_st_sop_i and tx_st_eop_i cycles unless there is backpressure with the deassertion of tx_st_ready_o.
coreclkout_hip EP/RP/BP

x16: tx_st_sop_i[1:0]

x8/x4: tx_st_sop_i

I
Indicate the first cycle of a TLP when asserted in conjunction with the corresponding bit of tx_st_valid_i. For the x16 configuration:
  • tx_st_sop_i[1]: When asserted, indicates the start of a TLP in tx_st_data_i[511:256].
  • tx_st_sop_i[0]: When asserted, indicates the start of a TLP in tx_st_data_i[255:0].

These signals are asserted for one clock cycle per each TLP. They also qualify the corresponding tx_st_hdr_i and tx_st_tlp_prfx_i signals.

coreclkout_hip EP/RP/BP

x16: tx_st_eop_i[1:0]

x8/x4: tx_st_eop_i

I
Indicate the last cycle of a TLP when asserted in conjunction with the corresponding bit of tx_st_valid_i. For the x16 configuration:
  • tx_st_eop_i[1]: When asserted, indicates the end of a TLP in tx_st_data_i[511:256].
  • tx_st_eop_i[0]: When asserted, indicates the end of a TLP in tx_st_data_i[255:0].

These signals are asserted for one clock cycle per each TLP.

 coreclkout_hip EP/RP/BP

x16: tx_st_valid_i[1:0]

x8/x4: tx_st_valid_i

I

Qualify the corresponding data segment of tx_st_data_i into the IP core on ready cycles.

To facilitate timing closure, Intel recommends that you register both the tx_st_ready_o and tx_st_valid_i signals.

Note: There must be no Idle cycle between the tx_st_sop_i and tx_st_eop_i cycles unless there is backpressure with the deassertion of tx_st_ready_o.
coreclkout_hip EP/RP/BP
tx_st_ready_o O

Indicates that the PCIe Hard IP is ready to accept data for transmission.

The readyLatency is three cycles.

If tx_st_ready_o is asserted by the Transaction Layer in the PCIe Hard IP on cycle <n>, then <n> + readyLatency is a ready cycle, during which the Application may assert tx_st_valid_i and transfer data.

If tx_st_ready_o is deasserted by the Transaction Layer on cycle <n>, then the Application must deassert tx_st_valid_i within the readyLatency number of cycles after cycle <n>.

tx_st_ready_o can be deasserted in the following conditions:
  • The LTSSM is not ready.
  • A Retry is in progress.
  • There are not enough credits available to send the request.
  • The P-Tile Avalon-ST IP is busy sending internally generated TLPs.
  • The internal P-Tile TX FIFO is full.
 coreclkout_hip EP/RP/BP

x16: tx_st_err_i[1:0]

x8/x4: tx_st_err_i

I
When asserted, indicate an error in the transmitted TLP. These signals are asserted with tx_st_eop_i and nullify a packet.
  • tx_st_err_i[1]: When asserted, specifies an error in tx_st_data_i[511:256].
  • tx_st_err_i[0]: When asserted, specifies an error in tx_st_data_i[255:0].
coreclkout_hip EP/RP/BP

x16: tx_st_hdr_i[255:0]

x8/x4: tx_st_hdr_i[127:0]

I
This is the header to be transmitted, which follows the TLP header format of the PCIe specifications except for the requester ID/completer ID fields (tx_st_hdr_i[95:80]):
  • tx_st_hdr_i[95:84]: tx_st_vf_num[11:0]
  • tx_st_hdr_i[83]: tx_st_vf_active
  • tx_st_hdr_i[82:80]: tx_st_func_num[2:0]

A valid function number must be provided to tx_st_hdr_i[82:80]. When SR-IOV is not enabled, tx_st_hdr_i[83] field must be set to low, tx_st_hdr_i[95:84] can be set to any value.

These signals are valid when the corresponding tx_st_sop_i signal is asserted.

The header uses a Big Endian implementation.

 coreclkout_hip EP/RP/BP

x16: tx_st_tlp_prfx_i[63:0]

x8/x4: tx_st_tlp_prfx_i[31:0]

I

This is the TLP prefix to be transmitted, which follows the TLP prefix format of the PCIe specifications. PASID is included.

These signals are valid when the corresponding tx_st_sop_i signal is asserted.

The TLP prefix uses a Big Endian implementation (i.e. the Fmt field is in bits [31:29] and the Type field is in bits [28:24]).

If no prefix is present for a given TLP, that dword, including the Fmt field, is all zeros.

coreclkout_hip EP/RP/BP

x16: tx_st_data_par_i[63:0]

x8: tx_st_data_par_i[31:0]

x4: tx_st_data_par_i[15:0]

I

Byte parity for tx_st_data_i. Bit [0] corresponds to tx_st_data_i[7:0], bit [1] corresponds to tx_st_data_i[15:8], and so on.

By default, the PCIe Hard IP generates the parity for the TX data. Any parity bytes provided on these signals will not be used by the PCIe Hard IP for the parity generation and checking.

coreclkout_hip EP/RP/BP

x16: tx_st_hdr_par_i[31:0]

x8/x4: tx_st_hdr_par_i[15:0]

I

Byte parity for tx_st_hdr_i.

By default, the PCIe Hard IP generates the parity for the TX header. Any parity bytes provided on these signals will not be used by the PCIe Hard IP for the parity generation and checking.

coreclkout_hip EP/RP/BP

x16: tx_st_tlp_prfx_par_i[7:0]

x8/x4: tx_st_tlp_prfx_par_i[3:0]

I

Byte parity for tx_st_tlp_prfx_i.

By default, the PCIe Hard IP generates the parity for the TX TLP prefix. Any parity bytes provided on these signals will not be used by the PCIe Hard IP for the parity generation and checking.

coreclkout_hip EP/RP/BP
tx_par_err_o O Asserted for a single cycle to indicate a parity error during TX TLP transmission. The IP core transmits TX TLP packets even when a parity error is detected. coreclkout_hip EP/RP/BP
Figure 23.  Avalon® -ST TX Packet Interface in 1x16 Mode
Figure 24.  Avalon® -ST TX Packet Interface in 2x8 and 1x8 Modes
Note: In 2x8 mode, the pn prefix in the signal names is p0 and p1 for the two x8 ports. In 1x8 mode, the pn prefix in the signal names is p0 for the one x8 port.
Figure 25.  Avalon® -ST TX Packet Interface in 4x4 Mode
Note: In 4x4 mode, the pn prefix in the signal names is p0, p1, p2 and p3 for the four x4 ports.
Note: In the diagrams for the 1x16 mode or 2x8 and 1x8 modes, D0_0 represents a 256-bit block of data. However, in the diagram for the 4x4 mode, D0_0 represents a 128-bit block of data.
Level Two Title