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December 2013 Altera Corporation Cyclone V Hard IP for PCI Express
User Guide
17. Testbench and Design Example
This chapter introduces the Root Port or Endpoint design example including a
testbench, BFM, and a test driver module. You can create this design example using
the design described in Chapter 2, Getting Started with the Cyclone V Hard IP for PCI
Express.
When configured as an Endpoint variation, the testbench instantiates a design
example and a Root Port BFM, which provides the following functions:
■ A configuration routine that sets up all the basic configuration registers in the
Endpoint. This configuration allows the Endpoint application to be the target and
initiator of PCI Express transactions.
■ A Verilog HDL procedure interface to initiate PCI Express transactions to the
Endpoint.
The testbench uses a test driver module, altpcietb_bfm_driver_chaining to exercise
the chaining DMA of the design example. The test driver module displays
information from the Endpoint Configuration Space registers, so that you can
correlate to the parameters you specified using the parameter editor.
When configured as a Root Port, the testbench instantiates a Root Port design example
and an Endpoint model, which provides the following functions:
■ A configuration routine that sets up all the basic configuration registers in the Root
Port and the Endpoint BFM. This configuration allows the Endpoint application to
be the target and initiator of PCI Express transactions.
■ A Verilog HDL procedure interface to initiate PCI Express transactions to the
Endpoint BFM.
The testbench uses a test driver module, altpcietb_bfm_driver_rp, to exercise the
target memory and DMA channel in the Endpoint BFM. The test driver module
displays information from the Root Port Configuration Space registers, so that you
can correlate to the parameters you specified using the parameter editor. The
Endpoint model consists of an Endpoint variation combined with the chaining DMA
application described above.
1 The Altera testbench and Root Port or Endpoint BFM provide a simple method to do
basic testing of the Application Layer logic that interfaces to the variation. However,
the testbench and Root Port BFM are not intended to be a substitute for a full
verification environment. To thoroughly test your Application Layer, Altera suggests
that you obtain commercially available PCI Express verification IP and tools, or do
your own extensive hardware testing or both.
Your Application Layer design may need to handle at least the following scenarios
that are not possible to create with the Altera testbench and the Root Port BFM:
■ It is unable to generate or receive Vendor Defined Messages. Some systems
generate Vendor Defined Messages and the Application Layer must be designed
to process them. The Hard IP block passes these messages on to the Application
Layer which, in most cases should ignore them.
December 2013
UG-01110-1.5
- User Guide 1
- Contents 3
- Chapter 7. IP Core Interfaces 4
- Chapter 9. Reset and Clocks 5
- Chapter 18. Debugging 8
- 1. Datasheet 9
- 1–2 Chapter 1: Datasheet 10
- Features 10
- Notes to Table 1–2: 11
- Release Information 12
- Device Family Support 12
- Configurations 12
- Debug Features 13
- IP Core Verification 14
- Recommended Speed Grades 15
- 1–8 Chapter 1: Datasheet 16
- Hard IP for PCI Express 17
- Qsys Design Flow 25
- Generating the Testbench 26
- Simulating the Example Design 27
- Modifying the Example Design 34
- Running Qsys 36
- Table 3–5 38
- On Chip r 40
- Direct BFM’s shared memory 47
- {*reconfig_xcvr_clk*} 50
- Compiling the Design 51
- Programming a Device 51
- System Settings 54
- Port Functions 55
- Error Reporting 57
- 31 19 18 17 16 15 14 58
- Power Management 59
- Legacy Interrupt 63
- Base Address Registers 66
- PCI Express/PCI Capabilities 67
- Header 68
- 6. IP Core Architecture 75
- Avalon-ST Interface 77
- RX Datapath 77
- TX Datapath 77
- Altera FPGA 77
- Clocks and Reset 78
- Interrupts 79
- Transaction Layer 79
- Protocol Layers 80
- Configuration Space 81
- Data Link Layer 81
- Figure 6–4. Data Link Layer 82
- Physical Layer 83
- Figure 6–5. Physical Layer 84
- Multi-Function Support 86
- PCI Express Avalon-MM Bridge 86
- Avalon-MM Bridge TLPs 88
- Figure 6–9. Poor Address Map 93
- RX Block 97
- Avalon-MM RX Master Block 97
- TX Block 98
- Interrupt Handler Block 98
- 7. IP Core Interfaces 99
- Note to Table 7–1: 100
- RX Port 102
- Avalon-ST RX Interface 104
- Note to Figure 7–8: 109
- Avalon-ST TX Interface 114
- Note to Table 7–4: 117
- ECRC Forwarding 122
- Clock Signals 122
- Reset Signals 123
- and the LTSSM L0 state 125
- ECC Error Signals 126
- Interrupts for Endpoints 126
- Interrupts for Root Ports 127
- Completion Side Band Signals 127
- Specification, Rev. 2.1 129
- D E F 0 1 2 3 132
- Notes to Table 7–12: 133
- LMI Signals 137
- LMI Read Operation 138
- LMI Write Operation 138
- Power Management Signals 139
- (Full-Featured Qsys) 141
- Completer-Only Single DWord 142
- RX Avalon-MM Master Signals 144
- Transceiver Reconfiguration 146
- Serial Interface Signals 146
- PIPE Interface Signals 150
- Test Signals 153
- Notes to Table 7–26: 154
- 8. Register Descriptions 155
- Note to Table 8–2: 156
- Note to Table 8–3: 157
- Note to Table 8–4: 157
- Note to Table 8–5: 157
- Note to Table 8–6: 158
- Note to Table 8–7: 158
- Note to Table 8–8: 159
- s and wait 162
- PCI Express Mailbox Registers 167
- Note to Table 8–30: 168
- Root Port TLP Data Registers 170
- Sending a TLP 173
- Receiving a Completion TLP 173
- Endpoints 174
- Avalon-MM Mailbox Registers 175
- Spec 2.1 176
- 9. Reset and Clocks 181
- Example Design 182
- 127 cycles 184
- 300 PPM 185
- Transceiver Clock Signals 186
- Supported Message Types 189
- Notes to Table 10–1: 191
- Receive Buffer Reordering 192
- Notes to Table 10–2: 193
- MSI Interrupts 195
- 11–2 Chapter 11: Interrupts 196
- Note to Figure 11–4: 197
- Legacy Interrupts 198
- Application Layer 199
- 11–6 Chapter 11: Interrupts 200
- MSI/MSI-X Support 201
- Qsys System 202
- 12. Optional Features 203
- ECRC on the RX Path 204
- ECRC on the TX Path 205
- 13. Flow Control 207
- 13–2 Chapter 13: Flow Control 208
- Throughput of Posted Writes 208
- Chapter 13: Flow Control 13–3 209
- 13–4 Chapter 13: Flow Control 210
- 14. Error Handling 211
- Physical Layer Errors 212
- Data Link Layer Errors 212
- Transaction Layer Errors 213
- s limit 214
- Note to Table 14–4: 215
- Figure 15–2 218
- Core User Guide 219
- 16. SDC Timing Constraints 221
- Endpoint Testbench 224
- Root Port Testbench 225
- Chaining DMA Design Examples 226
- Root Complex 227
- Chaining DMA 227
- Hard IP for 227
- PCI Express 227
- Note to Table 17–2: 232
- Note to Table 17–4: 233
- Test Driver Module 236
- DMA Write Cycles 237
- DMA Read Cycles 239
- Root Port Design Example 240
- Root Port 241
- Variation 241
- (variation_name.v) 241
- Root Port BFM 242
- BFM Memory Map 244
- Figure 17–6 248
- BFM Read and Write Procedures 250
- BFM Procedures and Functions 251
- BFM Configuration Procedures 256
- Shared Memory Constants 257
- 18. Debugging 271
- 18–2 Chapter 18: Debugging 272
- Link Training 272
- Chapter 18: Debugging 18–3 273
- 18–4 Chapter 18: Debugging 274
- Chapter 18: Debugging 18–5 275
- Setting Up Simulation 276
- Chapter 18: Debugging 18–7 277
- Use Third-Party PCIe Analyzer 278
- BIOS Enumeration Issues 278
- Notes to Table A–7: 280
- Chapter : A–3 281
- Notes to Table A–16: 282
- Additional Information 283
- Info–2 Revision History 284
- How to Contact Altera 285
- Typographic Conventions 286
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