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Protocol Extensions Supported
The Transaction Layer supports the following protocol extensions:
• TLP Processing Hints (TPH)—Supports both a Requester and Completer. The Application Layer
should implement the TPH Requester Capabilities Structure using the soft logic in the Application
Layer Extended Configuration Space. The Transaction Layer supports both Protocol Hint (PH) bits
and Steering Tags (ST). The Transaction Layer does not support the optional Extended TPH TLP
prefix.
• Atomic Operations—Supports both Requester and Completer. The RX buffer supports two, four, or
eight non-posted data credits depending on the performance level you selected for the RX buffer
credit allocation—performance for received requests under the System Settings heading of the
parameter editor. The Transaction Layer also supports Atomic Operation Egress Blocking to prevent
forwarding of AtomicOp Requests to components that should not receive them.
• ID-Based Ordering (IDO)—The Transaction Layer supports ID-Based Ordering to permit certain
ordering restrictions to be relaxed to improve performance. However, the Transaction Layer does
reorder the TLPs. On the RX side, ID-Based reordering should be implemented in soft logic. On the
TX side, the Application Layer should set the IDO bit, which is bit 8 the Device Control Register
2, in the TLPs that it generates.
Data Link Layer
The Data Link Layer is located between the Transaction Layer and the Physical Layer. It maintains packet
integrity and communicates (by DLL packet transmission) at the PCI Express link level (as opposed to
component communication by TLP transmission in the interconnect fabric).
The DLL implements the following functions:
• Link management through the reception and transmission of DLL packets (DLLP), which are used for
the following functions:
• Power management of DLLP reception and transmission
• To transmit and receive ACK/NACK packets
• Data integrity through generation and checking of CRCs for TLPs and DLLPs
• TLP retransmission in case of NAK DLLP reception using the retry buffer
• Management of the retry buffer
• Link retraining requests in case of error through the Link Training and Status State Machine
(LTSSM) of the Physical Layer
10-12
Protocol Extensions Supported
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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