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Figure 5-32: 256-Bit Avalon-ST tx_st_data Cycle Definition for 3-Dword Header TLP with Qword
Addresses
01 10
clk
tx_st_data[63:0]
Aligned Data Unaligned Data
tx_st_data[127:64]
tx_st_data[191:128]
tx_st_data[255:192]
tx_st_sop
tx_st_eop
tx_st_empty[1:0]
Header 1 Header 0
XXXXXXXX Header 2
XXXXXXXX Data 0
XXXXXXXXX XXXXXXXX
Header 1 Header 0
Data 0 Header 2
XXXXXXXXX XXXXXXXX
XXXXXXXXX XXXXXXXX
Multiple Packets per Cycle on the Avalon-ST TX 256-Bit Interface
If you enable Multiple Packets Per Cycle under the Systems Settings heading, a TLP can start on a
128-bit boundary. This mode supports multiple start of packet and end of packet signals in a single cycle
when the Avalon-ST interface is 256 bits wide. The following figure illustrates this mode for a 256-bit
Avalon-ST TX interface. In this figure tx_st_eop[0] and tx_st_sop[1] are asserted in the same cycle.
Using this mode increases the complexity of the Application Layer logic but results in higher throughput,
depending on the TX traffic. Refer to Tradeoffs to Consider when Enabling Multiple Packets per Cycle for
an example of the bandwidth when Multiple Packets Per Cycle is enabled and disabled.
Figure 5-33: 256-Bit Avalon-ST TX Interface with Multiple Packets Per Cycle
tx_st_sop[0]
tx_st_eop[0]
tx_st_sop[1]
tx_st_eop[1]
tx_st_ready
tx_st_valid
tx_st_data[255:0] 12 ... 12... 12... 12... 12... 12... 12... 12... 00... 5A... 5A... 5A... 5A... 5A... 5A... 5A... 5A...
tx_st_empty[1:0]
5-32
Multiple Packets per Cycle on the Avalon-ST TX 256-Bit Interface
UG-01097_avst
2014.12.15
Altera Corporation
Interfaces and Signal Descriptions
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- User Guide 1
- Datasheet 2
- Features 3
- Interface 4
- Release Information 7
- Device Family Support 7
- UG-01097_avst 10
- 2014.12.15 10
- Debug Features 11
- IP Core Verification 11
- Recommended Speed Grades 12
- • All Development Kits 14
- PCI Express 15
- Qsys Design Flow 16
- Generating the Testbench 17
- Simulating the Example Design 18
- Directory Description 19
- Time TLP Type Payload 19
- TLP Header 19
- Modifying the Example Design 23
- Separate Component 24
- Generating the Qsys System 27
- Parameter Value 28
- Parameter Settings 38
- Parameter Value Description 39
- Device Capabilities 45
- Error Reporting 47
- Link Capabilities 48
- MSI and MSI-X Capabilities 49
- Slot Capabilities 50
- Power Management 51
- PHY Characteristics 52
- Avalon‑ST RX Interface 54
- Packet TLP 59
- Aligned Addresses 64
- Single Packet Per Cycle 67
- Avalon-ST TX Interface 70
- Data 0 Header 2 83
- Clock Signals 85
- ECRC Forwarding 90
- Error Signals 90
- Interrupts for Endpoints 91
- Completion Side Band Signals 93
- Signal Directi 94
- Description 94
- Related Information 101
- Parity Signals 102
- LMI Signals 103
- Signal Direction Description 104
- Altera Corporation 107
- Send Feedback 107
- Field and Bit Map 112
- 0134678951 112
- Bit(s) Field Description 113
- Power Management Signals 115
- 15 011623 8 2791213142431 117
- Transceiver Reconfiguration 118
- Serial Data Signals 119
- PIPE Interface Signals 123
- Test Signals 128
- Registers 129
- Altera-Defined VSEC Registers 137
- CvP Registers 138
- 2014.08.18 139
- Bits Register Description 142
- Reset and Clocks 145
- Example Design 146
- Hard IP for PCI Express 146
- Clock Domains 149
- Data Rate Frequency 150
- Clock Summary 152
- Interrupts 153
- MSI Interrupts 154
- Allocated 155
- Implementing MSI-X Interrupts 156
- Legacy Interrupts 158
- Interrupts for Root Ports 159
- Error Handling 160
- Physical Layer Errors 161
- Data Link Layer Errors 161
- Transaction Layer Errors 162
- Error Type Description 163
- Status Bit Conditions 166
- IP Core Architecture 168
- Hard IP for PCI Express 169
- Top-Level Interfaces 170
- Avalon-ST Interface 170
- Clocks and Reset 171
- Hard IP Reconfiguration 171
- Transaction Layer 172
- Configuration Space 173
- (Soft Logic) 175
- Altera FPGA 175
- Protocol Extensions Supported 179
- Data Link Layer 179
- Physical Layer 181
- TX Packets 182
- Supported Message Types 184
- INTX Messages 184
- Power Management Messages 185
- Error Signaling Messages 186
- Locked Transaction Message 187
- Slot Power Limit Message 187
- Vendor-Defined Messages 187
- Hot Plug Messages 188
- Receive Buffer Reordering 190
- Using Relaxed Ordering 192
- Throughput Optimization 195
- Throughput of Posted Writes 197
- Design Implementation 199
- CONF_DONE 200
- Endpoint Reset 200
- Root Port Reset 200
- SDC Timing Constraints 201
- Optional Features 203
- ECRC on the RX Path 204
- ECRC on the TX Path 205
- Subscribe 208
- Testbench and Design Example 212
- Root Port Testbench 215
- Chaining DMA Design Examples 215
- Root Complex 217
- Chaining DMA 217
- Hard IP for 217
- BAR/Address Map 220
- Memory BAR Mapping 221
- Bit Field Description 222
- Addr Register Name 222
- Offset to Base 225
- Descriptor Type Description 225
- Byte Address 225
- Bits[21:18] Bit[17] Bit[16] 226
- Descriptor Field Endpoint 226
- RC Access Description 226
- Test Driver Module 227
- DMA Write Cycles 228
- Shared Memory 229
- DMA Read Cycles 230
- Registers (BAR2) 231
- Root Port Design Example 232
- Root Port 233
- Variation 233
- (variation_name.v) 233
- Root Port BFM 234
- BFM Configuration Procedures 235
- BFM Request Interface 235
- BFM Memory Map 236
- Offset (Bytes) Description 238
- BFM Procedures and Functions 242
- Location altpcietb_bfm_rdwr.v 243
- Express address 244
- Shared Memory Constants 251
- Constant Description 252
- Location 257
- Debugging Simulations 269
- Debugging 270
- Setting Up Simulation 276
- Use Third-Party PCIe Analyzer 277
- BIOS Enumeration Issues 277
- Address[31:2] 278
- Figure A-6: I/O Read Request 280
- 7 6 5 4 3 2 1 0 284
- Core Config 8 4 1 284
- Additional Information 286
- Date Version Changes Made 287
- How to Contact Altera 290
- Typographic Conventions 291
- Visual Cue Meaning 292
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