R-tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide

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ID 683501
Date 10/06/2021
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Document Table of Contents
Document Table of Contents x
1. Introduction 2. IP Architecture and Functional Description 3. Parameters 4. Interfaces 5. Advanced Features 6. R-tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide Archives 7. Document Revision History for the R-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
1. Introduction 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 Support Levels
1.1. Overview x
1.1.1. Standards and Specifications Compliance
2. IP Architecture and Functional Description x
2.1. Overview 2.2. PCIe Hard IP Mode 2.3. PIPE Direct Mode
2.2. PCIe Hard IP Mode x
2.2.1. Clocking 2.2.2. Reset 2.2.3. PCI Express Protocol Stack
2.2.3. PCI Express Protocol Stack x
2.2.3.1. PMA/PCS 2.2.3.2. Data Link Layer Overview 2.2.3.3. Transaction Layer Overview
2.3. PIPE Direct Mode x
2.3.1. Clocking 2.3.2. Reset 2.3.3. PIPE Layer
3. Parameters x
3.1. Top-Level Settings 3.2. Core Parameters
4. Interfaces x
4.1. Overview 4.2. Clocks and Resets 4.3. Serial Data Interface 4.4. PCI Express Mode 4.5. PIPE Direct Mode
4.2. Clocks and Resets x
4.2.1. Clocks 4.2.2. Resets
4.4. PCI Express Mode x
4.4.1. Avalon® Streaming Interface 4.4.2. Precision Time Measurement (PTM) Interface 4.4.3. Interrupt Interface 4.4.4. Hard IP Reconfiguration Interface 4.4.5. Error Interface 4.4.6. Completion Timeout Interface 4.4.7. Configuration Intercept Interface 4.4.8. Power Management Interface 4.4.9. Hard IP Status Interface 4.4.10. Page Request Services (PRS) Interface 4.4.11. Function-Level Reset (FLR) Interface 4.4.12. SR-IOV VF Error Flag Interface 4.4.13. General Purpose VSEC Interface
4.4.1. Avalon® Streaming Interface x
4.4.1.1. TLP Header and Data Alignment for the Avalon® streaming RX and TX Interfaces 4.4.1.2. Credit Control 4.4.1.3. Avalon® Streaming RX Interface 4.4.1.4. Avalon® Streaming TX Interface 4.4.1.5. Tag Allocation
4.4.1.2. Credit Control x
4.4.1.2.1. Credit Interface - Data and Header 4.4.1.2.2. Credit Initialization 4.4.1.2.3. Credit Update/Release 4.4.1.2.4. RX Flow Control Interface 4.4.1.2.5. TX Flow Control Interface
4.4.1.2.4. RX Flow Control Interface x
4.4.1.2.4.1. Completion Buffer Size
4.4.1.4. Avalon® Streaming TX Interface x
4.4.1.4.1. Avalon® Streaming TX Interface tx_st_ready_o Behavior
4.4.3. Interrupt Interface x
4.4.3.1. Legacy Interrupts 4.4.3.2. MSI 4.4.3.3. MSI-X
4.4.3.3. MSI-X x
4.4.3.3.1. Implementing MSI-X Interrupts
4.4.8. Power Management Interface x
4.4.8.1. Endpoint D3Hot Entry 4.4.8.2. Endpoint D3Hot Exit
4.5. PIPE Direct Mode x
4.5.1. Data Signals 4.5.2. Message Channel 4.5.3. Deskew Channel 4.5.4. PIPE Direct Reset Sequence 4.5.5. PIPE Direct Speed Change 4.5.6. PIPE Lane Reset Staggering 4.5.7. Unused Lanes in PIPE Direct Mode 4.5.8. PIPE Direct Mode TX/RX Datapaths
4.5.1. Data Signals x
4.5.1.1. Transmit Signals 4.5.1.2. Receive Signals
5. Advanced Features x
5.1. PCIe Port Bifurcation and PHY Channel Mapping 5.2. Virtualization Support 5.3. TLP Bypass Mode
5.2. Virtualization Support x
5.2.1. SR-IOV Support 5.2.2. VirtIO Support
5.2.1. SR-IOV Support x
5.2.1.1. SR-IOV Supported Features List 5.2.1.2. Implementation 5.2.1.3. VF to PF Mapping 5.2.1.4. Function Level Reset (FLR)
5.2.1.2. Implementation x
5.2.1.2.1. VF Error Flag Interface (for x16/x8 Cores Only)
5.2.2. VirtIO Support x
5.2.2.1. VirtIO Supported Features List 5.2.2.2. Overview 5.2.2.3. Parameters 5.2.2.4. VirtIO PCI Configuration Access Interface 5.2.2.5. Registers
5.2.2.5. Registers x
5.2.2.5.1. VirtIO Common Configuration Capability Register (Address: 0x012) 5.2.2.5.2. VirtIO Common Configuration BAR Indicator Register (Address: 0x013) 5.2.2.5.3. VirtIO Common Configuration BAR Offset Register (Address: 0x014) 5.2.2.5.4. VirtIO Common Configuration Structure Length Register (Address 0x015) 5.2.2.5.5. VirtIO Notifications Capability Register (Address: 0x016) 5.2.2.5.6. VirtIO Notifications BAR Indicator Register (Address: 0x017) 5.2.2.5.7. VirtIO Notifications BAR Offset Register (Address: 0x018) 5.2.2.5.8. VirtIO Notifications Structure Length Register (Address: 0x019) 5.2.2.5.9. VirtIO Notifications Notify Off Multiplier Register (Address: 0x01A) 5.2.2.5.10. VirtIO ISR Status Capability Register (Address: 0x02F) 5.2.2.5.11. VirtIO ISR Status BAR Indicator Register (Address: 0x030) 5.2.2.5.12. VirtIO ISR Status BAR Offset Register (Address: 0x031) 5.2.2.5.13. VirtIO ISR Status Structure Length Register (Address: 0x032) 5.2.2.5.14. VirtIO Device Specific Capability Register (Address: 0x033) 5.2.2.5.15. VirtIO Device Specific BAR Indicator Register (Address: 0x034) 5.2.2.5.16. VirtIO Device Specific BAR Offset Register (Address 0x035) 5.2.2.5.17. VirtIO Device Specific Structure Length Register (Address: 0x036) 5.2.2.5.18. VirtIO PCI Configuration Access Capability Register (Address: 0x037) 5.2.2.5.19. VirtIO PCI Configuration Access BAR Indicator Register (Address: 0x038) 5.2.2.5.20. VirtIO PCI Configuration Access BAR Offset Register (Address: 0x039) 5.2.2.5.21. VirtIO PCI Configuration Access Structure Length Register (Address: 0x03A) 5.2.2.5.22. VirtIO PCI Configuration Access Data Register (Address: 0x03B)
5.3. TLP Bypass Mode x
5.3.1. Overview 5.3.2. Register Settings for the TLP Bypass Mode 5.3.3. User Avalon Memory-mapped Interface 5.3.4. Avalon® Streaming Interface
5.3.2. Register Settings for the TLP Bypass Mode x
5.3.2.1. TLPBYPASS_ERR_EN (Address 0x1314) 5.3.2.2. TLPBYPASS_ERR_STATUS (Address 0x1310)
5.3.4. Avalon® Streaming Interface x
5.3.4.1. Configuration TLP 5.3.4.2. Transmit Interface 5.3.4.3. Receive Interface 5.3.4.4. Malformed TLP 5.3.4.5. ECRC
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)
1. Introduction
2. IP Architecture and Functional Description
3. Parameters
4. Interfaces
5. Advanced Features
6. R-tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide Archives
7. Document Revision History for the R-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

4.4.1.2.4. RX Flow Control Interface

The RX flow control interface provides information on the application's available RX buffer space for Posted (P), Non-Posted (NP) and Completion (CPL) transactions to the PCIe Hard IP. It reports the space available in number of credits as specified by the PCIe Specification.

Flow control credits are available for the following TLP categories:
  • Posted (P) transactions: TLPs that do not required a response.
  • Non-poseted (NP) transactions: TLPs that require a completion.
  • Completions (CPL): TLPs that respond to non-posted transactions.

For more information on how credit control in general is implemented in this IP, refer to Credit Control.

Table 18.  Categorization of Transaction Types
TLP Type Category
Memory Write Posted
Memory Read Non-Posted
Memory Read Lock
I/O Read
I/O Write
Configuration Read
Configuration Write
Fetch and Add AtomicOp
Message Posted
Completion Completion
Completion with Data
Completion Lock
Completion Lock with Data
Table 19.  RX Flow Control Interface Signals
Signal Name Direction Description EP/RP/BP Clock Domain
pX_rx_st_hcrdt_update_i[2:0] where

X = 0, 1, 2, 3 (IP core number)

Input

Indicates credit is made available for the different types of Header.

Each Header (including the TLP Prefix, if any) consumes one credit.

[0] : Posted Header (PH)

[1] : Non-Posted Header (NPH)

[2] : Completion Header (CPLH)

 EP/RP/BP coreclkout_hip
pX_rx_st_hcrdt_update_cnt_i[5:0] where

X = 0, 1, 2, 3 (IP core number)

Input

Indicates number of credits released.

[1:0] : number of PH credits released

[3:2] : number of NPH credits released

[5:4] : number of CPLH credits released

Valid when the corresponding pX_rx_st_hcrdt_update_i bit = 1.

The maximum number of credits released is three.

 EP/RP/BP coreclkout_hip
pX_rx_st_hcrdt_init_i[2:0] where

X = 0, 1, 2, 3 (IP core number)

Input

Credit Initialization indicator. These signals remain high for entire initialization phase. A High to Low transition indicates the completion of the credit initialization phase.

[0] : PH

[1] : NPH

[2] : CPLH

 EP/RP/BP coreclkout_hip
pX_rx_st_hcrdt_init_ack_o[2:0] where

X = 0, 1, 2, 3 (IP core number)

Output

Indicates the Host is ready for the credit initialization phase

[0] : PH

[1] : NPH

[2] : CPLH

 EP/RP/BP coreclkout_hip
pX_rx_st_dcrdt_update_i[2:0] where

X = 0, 1, 2, 3 (IP core number)

Input

Indicates credit is made available for the different types of Data.

[0] : Posted Data (PD)

[1] : Non-Posted Data (NPD)

[2] : Completion Data (CPLD)

 EP/RP/BP coreclkout_hip
pX_rx_st_dcrdt_update_cnt_i[11:0] where

X = 0, 1, 2, 3 (IP core number)

Input

Indicates number of credits released.

[3:0] : number of PD credits released

[7:4] : number of NPD credits released

[11:8] : number of CPLD credits released

Valid when the corresponding pX_rx_st_dcrdt_update_i bit = 1.

The maximum number of credits released is 15.

 EP/RP/BP coreclkout_hip
pX_rx_st_dcrdt_init_i[2:0] where

X = 0, 1, 2, 3 (IP core number)

Input

Credit Initialization indicator. These signals remain high for entire initialization phase. A High to Low transition indicates the completion of the credit initialization phase.

[0] : PD

[1] : NPD

[2] : CPLD

 EP/RP/BP coreclkout_hip
pX_rx_st_dcrdt_init_ack_o[2:0] where

X = 0, 1, 2, 3 (IP core number)

Input

Indicates the Host is ready for the credit initialization phase

[0] : PD

[1] : NPD

[2] : CPLD

 EP/RP/BP coreclkout_hip
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