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Signal Direction Description
tx_cred_fc_hip_
cons[5:0]
Output Asserted for 1 cycle each time the Hard IP consumes a credit.
These credits are from messages that the Hard IP for PCIe
generates for the following reasons:
• To respond to memory read requests
• To send error messages
This signal is not asserted when an Application Layer credit is
consumed. The Application Layer must keep track of its own
consumed credits. To calculate the total credits consumed, the
Application Layer must add its own credits consumed to those
consumed by the Hard IP for PCIe. The credit signals are valid
after the dlup (data link up) is asserted.
The 6 bits of this vector correspond to the following 6 types of
credit types:
• [5]: posted headers
• [4]: posted data
• [3]: non-posted header
• [2]: non-posted data
• [1]: completion header
• [0]: completion data
During a single cycle, the IP core can consume either a single
header credit or both a header and a data credit.
tx_cred_fc_
infinite[5:0]
Output When asserted, indicates that the corresponding credit type has
infinite credits available and does not need to calculate credit
limits. The 6 bits of this vector correspond to the following 6
types of credit types:
• [5]: posted headers
• [4]: posted data
• [3]: non-posted header
• [2]: non-posted data
• [1]: completion header
• [0]: completion data
tx_cred_fc_sel[1:0]
Input Signal to select between the tx_cred_hdr_fc and tx_cred_
data_fc outputs. The following encoding are defined:
• 2'b00: Output Posted credits
• 2'b01: Output Non-Posted credits
• 2'b10: Output Completions
tx_cred_hdr_fc[7:0]
Output Header credit limit for the FC posted writes. Each credit is 20
bytes.
UG-01145_avst
2015.05.04
Avalon-ST TX Interface
6-21
Interfaces and Signal Descriptions
Altera Corporation
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- Solutions 1
- Contents 2
- Datasheet 8
- Arria 10 Features 9
- Interface 10
- UG-01145_avst 11
- 2015.05.04 11
- Release Information 13
- Device Family Support 14
- Configurations 14
- Altera FPGA 15
- Debug Features 17
- IP Core Verification 18
- Recommended Speed Grades 18
- Qsys Design Flow 21
- Generating the Testbench 22
- Simulating the Example Design 22
- Directory Description 23
- Time TLP Type Payload 23
- TLP Header 23
- Modifying the Example Design 26
- Component 27
- File Name Description 28
- Subscribe 31
- 2014.08.18 32
- Generating the Qsys System 33
- Parameter Value 34
- Parameter Settings 44
- Parameter Value Description 45
- Device Capabilities 52
- Error Reporting 53
- Link Capabilities 54
- MSI and MSI-X Capabilities 55
- Slot Capabilities 56
- Power Management 57
- PHY Characteristics 58
- Avalon‑ST RX Interface 68
- Packet TLP 73
- Aligned Addresses 77
- Avalon-ST TX Interface 82
- Single Packet Per Cycle 95
- Data 0 Header 2 96
- Clock Signals 97
- Signal Direction Description 100
- Related Information 101
- ECRC Forwarding 102
- Error Signals 102
- Interrupts for Endpoints 103
- Interrupts for Root Ports 104
- Completion Side Band Signals 104
- Signal Directi 105
- Description 105
- Parity Signals 107
- LMI Signals 108
- Altera Corporation 112
- Send Feedback 112
- D E F 0 1 2 3 113
- Field and Bit Map 117
- 0134678951 117
- Bit(s) Field Description 118
- Power Management Signals 120
- 15 011623 8 2791213142431 121
- Bits Field Description 122
- Serial Data Signals 123
- PIPE Interface Signals 123
- Test Signals 128
- Registers 129
- Altera-Defined VSEC Registers 136
- CvP Registers 137
- Bits Register Description 141
- Arria 10 Reset and Clocks 144
- Clock Domains 147
- Clock Summary 149
- Interrupts 150
- MSI Interrupts 151
- Allocated 152
- Implementing MSI-X Interrupts 153
- Legacy Interrupts 155
- Error Handling 157
- Physical Layer Errors 158
- Data Link Layer Errors 158
- Transaction Layer Errors 159
- Error Type Description 160
- Status Bit Conditions 163
- IP Core Architecture 165
- Hard IP for PCI Express 166
- Top-Level Interfaces 167
- Clocks and Reset 168
- Hard IP Reconfiguration 168
- Transaction Layer 169
- Configuration Space 170
- (Soft Logic) 172
- Data Link Layer 174
- Physical Layer 176
- TX Packets 177
- Supported Message Types 179
- Power Management Messages 180
- Error Signaling Messages 181
- Locked Transaction Message 182
- Slot Power Limit Message 182
- Vendor-Defined Messages 182
- Hot Plug Messages 183
- Receive Buffer Reordering 185
- Using Relaxed Ordering 187
- Throughput Optimization 190
- Throughput of Posted Writes 192
- Design Implementation 194
- SDC Timing Constraints 195
- Optional Features 196
- ECRC on the RX Path 197
- ECRC on the TX Path 198
- TLP on Applica‐ 199
- TLP on Link Comments 199
- Testbench and Design Example 201
- Root Port Testbench 203
- Chaining DMA Design Examples 204
- Root Complex 205
- Chaining DMA 205
- Hard IP for 205
- PCI Express 205
- BAR/Address Map 208
- Memory BAR Mapping 209
- Bit Field Description 210
- Addr Register Name 211
- Byte Address 213
- Offset to Base 213
- Descriptor Type Description 213
- Test Driver Module 215
- DMA Write Cycles 216
- DMA Read Cycles 218
- Root Port Design Example 220
- Root Port 221
- Variation 221
- (variation_name.v) 221
- Root Port BFM 222
- BFM Configuration Procedures 223
- BFM Request Interface 223
- BFM Memory Map 224
- Offset (Bytes) Description 226
- BFM Procedures and Functions 230
- Location altpcietb_bfm_rdwr.v 231
- Shared Memory Constants 239
- Constant Description 240
- Location 245
- Setting Up Simulation 257
- Debugging 259
- Use Third-Party PCIe Analyzer 263
- BIOS Enumeration Issues 263
- Frequently Asked Questions 264
- 7 6 5 4 3 2 1 0 265
- Core Config 8 4 1 265
- Additional Information 267
- Date Version Changes Made 268
- How to Contact Altera 272
- Typographic Conventions 273
- Visual Cue Meaning 274
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