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Figure 4-12: 128-Bit Avalon-ST Interface Back-to-Back Transmission
The following figure illustrates back-to-back transmission on the 128-bit Avalon-ST RX interface with no
idle cycles between the assertion of rx_st_eop and rx_st_sop.
pld_clk
rx_st_data[127:0]
rx_st_sop
rx_st_eop
rx_st_empty
rx_st_ready
rx_st_valid
rx_st_err
BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... ...BB
Figure 4-13: 128-Bit Packet Examples of rx_st_empty and Single-Cycle Packet
The following figure illustrates a two-cycle packet with valid data in the lower qword
(rx_st_data[63:0]) and a one-cycle packet where the rx_st_sop and rx_st_eop occur in the same
cycle.
pld_clk
rx_st_data[127:0]
rx_st_sop
rx_st_eop
rx_st_empty
rx_st_ready
rx_st_valid
0000090 1C0020000F0000000100004 450AC89000012FE0D10004
For a complete description of the TLP packet header formats, refer to Appendix A, Transaction Layer
Packet (TLP) Header Formats.
Avalon-ST TX Interface
The following table describes the signals that comprise the Avalon-ST TX Datapath. The TX data signal
can be 64 or 128.
2014.12.15
Avalon-ST TX Interface
4-13
Interfaces and Signal Descriptions
Altera Corporation
Send Feedback
- User Guide 1
- Datasheet 2
- Features 3
- Release Information 5
- Device Family Support 6
- Altera FPGA 7
- Arria V or Cyclone V FPGA 8
- Debug Features 10
- IP Core Verification 11
- Recommended Speed Grades 11
- Qsys Design Flow 15
- Generating the Testbench 17
- Simulating the Example Design 17
- Directory Description 18
- Modifying the Example Design 21
- Parameter Settings 24
- Parameter Value Description 25
- Link Capabilities 27
- Device Capabilities 28
- Error Reporting 30
- Slot Capabilities 31
- Power Management 32
- <n> 34
- Legacy Interrupt 37
- Application Layer 39
- Avalon‑ST RX Interface 39
- Signal Direction Description 40
- Packet TLP 43
- Aligned Addresses 47
- Avalon-ST TX Interface 50
- Clock Signals 61
- Reset Signals 61
- Hard IP Status 63
- Error Signals 66
- ECRC Forwarding 66
- Interrupts for Endpoints 67
- Completion Side Band Signals 68
- Signal Directi 69
- Description 69
- Field and Bit Map 78
- 0134678951 78
- LMI Signals 79
- Hard IP for PCIe 80
- Power Management Signals 82
- 15 011623 8 2791213142431 83
- Bits Field Description 84
- Serial Interface Signals 86
- 9 Ch 18 Ch 87
- Variant Data CMU Clock 88
- PIPE Interface Signals 91
- Test Signals 95
- Registers 100
- Altera Corporation 100
- Send Feedback 100
- 2014.12.15 101
- Altera-Defined VSEC Registers 104
- CvP Registers 105
- Bits Register Description 109
- Reset and Clocks 112
- Example Design 113
- Hard IP for PCI Express 113
- Clock Domains 116
- Data Rate Frequency 117
- Related Information 117
- Clock Summary 118
- Interrupts 119
- Figure 7-1: MSI Handler Block 120
- Allocated 121
- Implementing MSI-X Interrupts 122
- Legacy Interrupts 124
- Interrupts for Root Ports 125
- Error Handling 126
- Physical Layer Errors 127
- Data Link Layer Errors 127
- Transaction Layer Errors 128
- Error Type Description 129
- Status Bit Conditions 132
- IP Core Architecture 134
- Hard IP for PCI Express 135
- Top-Level Interfaces 136
- Avalon-ST Interface 136
- Clocks and Reset 136
- Hard IP Reconfiguration 137
- Transceiver Reconfiguration 137
- Transaction Layer 138
- Configuration Space 139
- Data Link Layer 140
- Physical Layer 142
- TX Packets 143
- Multi-Function Support 144
- Supported Message Types 146
- INTX Messages 146
- Power Management Messages 147
- Error Signaling Messages 148
- Locked Transaction Message 149
- Slot Power Limit Message 149
- Vendor-Defined Messages 149
- Hot Plug Messages 150
- Receive Buffer Reordering 152
- Using Relaxed Ordering 154
- Throughput Optimization 157
- Throughput of Posted Writes 159
- Design Implementation 161
- Making Pin Assignments 162
- Optional Features 163
- ECRC on the RX Path 164
- ECRC on the TX Path 165
- Subscribe 168
- Testbench and Design Example 171
- Root Port Testbench 174
- Chaining DMA Design Examples 174
- Root Complex 176
- Chaining DMA 176
- Hard IP for 176
- PCI Express 176
- BAR/Address Map 179
- Memory BAR Mapping 180
- Bit Field Description 181
- Addr Register Name 181
- Byte Address 184
- Offset to Base 184
- Descriptor Type Description 184
- Bits[21:18] Bit[17] Bit[16] 185
- Descriptor Field Endpoint 185
- RC Access Description 185
- Test Driver Module 186
- DMA Write Cycles 187
- Shared Memory 188
- DMA Read Cycles 189
- Registers (BAR2) 190
- Root Port Design Example 191
- Root Port 192
- Variation 192
- (variation_name.v) 192
- Root Port BFM 193
- BFM Configuration Procedures 194
- BFM Request Interface 194
- BFM Memory Map 195
- Offset (Bytes) Description 197
- BFM Procedures and Functions 201
- Location altpcietb_bfm_rdwr.v 202
- Express address 203
- Shared Memory Constants 210
- Constant Description 211
- Location 216
- Debugging Simulations 228
- Debugging 229
- Setting Up Simulation 232
- Use Third-Party PCIe Analyzer 234
- BIOS Enumeration Issues 234
- Address[31:2] 235
- Figure A-6: I/O Read Request 237
- 7 6 5 4 3 2 1 0 241
- Core Config 8 4 1 241
- Additional Information 243
- Date Version Changes Made 244
- How to Contact Altera 246
- Typographic Conventions 247
- Visual Cue Meaning 248
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