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UG155 March 24, 2008
Operation of the Core
R
replace the link_timer_value[8:0] port that is used when the core is generated for a
single standard.
• link_timer_basex[8:0] The value placed on this port is sampled at the
beginning of the Auto-Negotiation cycle by the Link Timer when the core is set to
perform the 1000BASE-X standard.
• link_timer_sgmii[8:0] The value placed on this port is sampled at the
beginning of the Auto-Negotiation cycle by the Link Timer when the core is set to
perform the SGMII standard.
Both ports follow the same rules that are described in “Setting the Configurable Link
Timer,” page 156.
- LogiCORE™ IP 1
- Ethernet 1000BASE-X 1
- PCS/PMA or SGMII v9.1 1
- Revision History 2
- Table of Contents 3
- Chapter 10: Auto-Negotiation 5
- Appendix B: Core Latency 7
- Appendix F: Debugging Guide 7
- Schedule of Figures 9
- Schedule of Tables 13
- About This Guide 15
- Conventions 16
- Online Document 17
- Preface: About This Guide 18
- IP core 19
- Additional Core Resources 20
- Technical Support 20
- Feedback 20
- Document 21
- Chapter 1: Introduction 22
- Core Architecture 23
- GMII Block 24
- PCS Transmit Engine 24
- RocketIO Interface Block 25
- 8B/10B Decoder 26
- Receiver Elastic Buffer 26
- TBI Block 26
- 8B/10B Encoder 26
- Core Interfaces 27
- Chapter 2: Core Architecture 28
- Client Side Interface 31
- Common Signal Pinout 33
- Signal Direction Description 35
- Physical Side Interface 36
- Chapter 3 39
- Select Standard 40
- Core Functionality 40
- Physical Interface 41
- MDIO Management Interface 41
- RocketIO Tile Configuration 43
- Output Generation 44
- Designing with the Core 45
- Design Guidelines 50
- Write an HDL Application 51
- Synthesize your Design 51
- Create a Bitstream 51
- Know the Degree of Difficulty 51
- Keep it Registered 52
- Use Supported Design Flows 52
- Chapter 5 53
- GMII Reception 54
- Frame Reception with Errors 55
- False Carrier 56
- Bit[0]: Link Status 56
- Bit[1]: Link Synchronization 56
- GMII Transmission 57
- Overview 59
- Implementing External GMII 61
- GMII Receiver Logic 66
- The Ten-Bit Interface 69
- Receiver Logic 70
- Ten-Bit-Interface Logic 71
- Method 2 74
- Block Level 77
- 1000BASE-X with RocketIO 79
- (Block Level from 84
- Transceivers for 1000BASE-X 91
- Chapter 8 95
- Analysis 96
- Closely Related Clock Sources 98
- UG155 March 24, 2008 100
- '0' 102
- '1' 102
- Virtex-5 RocketIO GTP Wizard 103
- REFCLKOUT 104
- Virtex-5 RocketIO GTX Wizard 105
- Virtex-II Pro Devices 107
- Virtex-4 FX Devices 109
- Virtex-5 LXT and SXT Devices 111
- Virtex-5 FXT Devices 113
- Configuration and Status 115
- MDIO Transactions 116
- MDIO Addressing 117
- Register Address (REGAD) 118
- Management Registers 119
- Register 0: Control Register 120
- Register 1: Status Register 122
- Register 8: Next Page Receive 127
- Register 15: Extended Status 128
- Register 0: SGMII Control 135
- Register 1: SGMII Status 137
- Optional Configuration Vector 151
- Auto-Negotiation 153
- SGMII Standard 155
- 1000BASE-X Standard 156
- Simulating Auto-Negotiation 156
- SGMII Standards 157
- Operation of the Core 158
- Constraining the Core 161
- Clock Period Constraints 162
- Setting MGT Attributes 162
- Constraints 163
- MGT Placement Constraints 165
- Switching Constraints 168
- Ten-Bit Interface Constraints 168
- TBI Input Setup/Hold Timing 170
- Virtex-4 Devices 171
- GMII IOB Constraints 173
- GMII Input Setup/Hold Timing 174
- Virtex-4 devices 175
- Virtex-5 devices 175
- Virtex-4 or Virtex-5 Devices 176
- = 8 - 6.501 177
- = 1.499 ns 177
- = 7.893 - 8 177
- = -0.107 ns 177
- Interfacing to Other Cores 179
- Switching) Functionality 185
- IOB LOGIC 187
- Special Design Considerations 197
- Loopback 199
- Transceivers 199
- Implementing the Design 201
- Implementation 202
- Static Timing Analysis 203
- Generating a Bitstream 203
- Generating a Simulation Model 203
- Using the Model 203
- Virtex-5 Devices 204
- Interoperability 205
- Transmit Path Latency 207
- Receive Path Latency 207
- Appendix C 209
- 1000BASE-X State Machines 211
- Start of Frame Encoding 212
- Reception of the Even Case 213
- The Odd Transmission Case 213
- Reception of the Odd Case 214
- End of Frame Encoding 215
- Appendix E 219
- 5000 x 18 = 90000 bytes 220
- Virtex-4 FX 221
- 122 - Overflow Mark 222
- 6 - Underflow Mark 222
- Rx Elastic Buffer 223
- Clock Correction 224
- Jumbo Frame Reception 226
- Debugging Guide 227
- RocketIO Transceiver Specific 229
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