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Tracing a transaction through the TX datapath involves the following steps:
1. The Transaction Layer informs the Application Layer that sufficient flow control credits exist for a
particular type of transaction using the TX credit signals. The Application Layer may choose to ignore
this information.
2. The Application Layer requests permission to transmit a TLP. The Application Layer must provide the
transaction and must be prepared to provide the entire data payload in consecutive cycles.
3. The Transaction Layer verifies that sufficient flow control credits exist and acknowledges or postpones
the request.
4. The Transaction Layer forwards the TLP to the Data Link Layer.
Figure 10-2: Architecture of the Transaction Layer: Dedicated Receive Buffer
Transaction Layer TX Datapath
Transaction Layer RX Datapath
Avalon-ST
RX Control
Configuration Space
TLPs to
Data Link Layer
RX Transaction
Layer Packet
Avalon-ST RX Data
Avalon-ST
TX Data
to Application Layer
ConfigurationRequests
Reordering
RX Buffer
Posted & Completion
Non-Posted
Flow Control Update
Transaction Layer
Packet FIFO
Width
Adapter
( <256
bits)
Packet
Alignment
TX
Control
RX
Control
TX Flow
Control
10-6
Transaction Layer
UG-01127_avst
2014.08.18
Altera Corporation
IP Core Architecture
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- User Guide 1
- Datasheet 2
- Features 3
- Interface 4
- Release Information 7
- Device Family Support 7
- UG-01127_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 18
- 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 92
- Signal Directi 93
- Description 93
- Parity Signals 95
- LMI Signals 96
- Altera Corporation 100
- Send Feedback 100
- Field and Bit Map 105
- 0134678951 105
- Bit(s) Field Description 106
- Related Information 106
- Signal Direction Description 107
- Power Management Signals 108
- 15 011623 8 2791213142431 110
- Transceiver Reconfiguration 111
- Serial Data Signals 112
- PIPE Interface Signals 116
- Test Signals 121
- Registers 122
- Altera-Defined VSEC Registers 130
- CvP Registers 131
- 2014.08.18 132
- Bits Register Description 135
- Reset and Clocks 138
- Example Design 139
- Hard IP for PCI Express 139
- Clock Domains 142
- Data Rate Frequency 143
- Clock Summary 145
- Interrupts 146
- MSI Interrupts 147
- Allocated 148
- Implementing MSI-X Interrupts 149
- Legacy Interrupts 151
- Interrupts for Root Ports 152
- Error Handling 153
- Physical Layer Errors 154
- Data Link Layer Errors 154
- Transaction Layer Errors 155
- Error Type Description 156
- Status Bit Conditions 159
- IP Core Architecture 161
- Hard IP for PCI Express 162
- Top-Level Interfaces 163
- Avalon-ST Interface 163
- Clocks and Reset 164
- Hard IP Reconfiguration 164
- Transaction Layer 165
- Configuration Space 167
- (Soft Logic) 168
- Altera FPGA 168
- Protocol Extensions Supported 172
- Data Link Layer 172
- Physical Layer 174
- TX Packets 175
- Supported Message Types 177
- INTX Messages 177
- Power Management Messages 178
- Error Signaling Messages 179
- Locked Transaction Message 180
- Slot Power Limit Message 180
- Vendor-Defined Messages 180
- Hot Plug Messages 181
- Receive Buffer Reordering 183
- Using Relaxed Ordering 185
- Throughput Optimization 188
- Throughput of Posted Writes 190
- Design Implementation 192
- CONF_DONE 193
- Endpoint Reset 193
- Root Port Reset 193
- SDC Timing Constraints 194
- Optional Features 196
- ECRC on the RX Path 197
- ECRC on the TX Path 198
- Subscribe 201
- Testbench and Design Example 205
- Root Port Testbench 208
- Chaining DMA Design Examples 208
- Root Complex 210
- Chaining DMA 210
- Hard IP for 210
- BAR/Address Map 213
- Memory BAR Mapping 214
- Bit Field Description 215
- Addr Register Name 215
- Byte Address 218
- Offset to Base 218
- Descriptor Type Description 218
- Bits[21:18] Bit[17] Bit[16] 219
- Descriptor Field Endpoint 219
- RC Access Description 219
- Test Driver Module 220
- DMA Write Cycles 221
- Shared Memory 222
- DMA Read Cycles 223
- Registers (BAR2) 224
- Root Port Design Example 225
- Root Port 226
- Variation 226
- (variation_name.v) 226
- Root Port BFM 227
- BFM Configuration Procedures 228
- BFM Request Interface 228
- BFM Memory Map 229
- Offset (Bytes) Description 231
- BFM Procedures and Functions 235
- Location altpcietb_bfm_rdwr.v 236
- Express address 237
- Shared Memory Constants 244
- Constant Description 245
- Location 250
- Debugging Simulations 262
- Debugging 263
- Setting Up Simulation 269
- Use Third-Party PCIe Analyzer 270
- BIOS Enumeration Issues 270
- Address[31:2] 271
- Figure A-6: I/O Read Request 273
- 7 6 5 4 3 2 1 0 277
- Core Config 8 4 1 277
- Additional Information 279
- Date Version Changes Made 280
- How to Contact Altera 283
- Typographic Conventions 284
- Visual Cue Meaning 285
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