Altera CPRI IP Core Manuel d'utilisateur Page 204
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
E–26 Appendix E: Delay Measurement and Calibration
Single-Hop Delay Measurement
CPRI MegaCore Function December 2013 Altera Corporation
User Guide
To calculate the round-trip cable delay in this system, perform the steps in
“Round-Trip and Cable Delay Calculation Example 1: Two Stratix IV GX Devices”,
replacing values according to Table E–11. The final row of Table E–11 shows the
calculated cable delay.
Table E–11. Example 4 Data and Calculations
Calculation
Component
Delay Component Relevant Register Value or Source Table Delay
Total
(decimal)
Round trip delay
rx_round_trip_delay
= 0x6D 109
REC Tx path delay
T_T4 Table E–6 on page E–14 6.5
16.1
Tx buffer delay
tx_ex_buf_delay
= 0x33A 6.50
T_txv_TX
tx_bitslipboundaryselect
= 0x0
Table E–7 on page E–16
3.1
REC Rx path delay
T_txv_RX
rx_bitslipboundaryselectout
= 0x2
Table E–1 on page E–5
5.65
44.23
Rx buffer delay
rx_ex_buf_delay
= 0xF2C 30.58
Calibration pointer
cal_pointer
= 3 3
Byte alignment
rx_byte_delay
= 0 0
T_R1 Table E–3 on page E–8 5
T14 (Round trip delay minus REC Tx path delay minus REC Rx path delay) 48.67
RE Tx path delay
T_T4 Table E–6 on page E–14 7
19.79
Tx buffer delay
tx_ex_buf_delay
= 0x46B 8.94
T_txv_TX
tx_bitslipboundaryselect
= 0xA
(decimal 10)
Table E–7 on page E–16
3.85
RE Rx path delay
T_txv_RX
rx_bitslipboundaryselectout
= 0x7
Table E–1 on page E–5
7.025
27.025
Rx buffer delay
rx_ex_buf_delay
= 0x5F4 12
Calibration pointer
cal_pointer
= 3 3
Byte alignment
rx_byte_delay
= 0 0
T_R1 Table E–3 on page E–8 5
Loopback delay on RE slave 1
Toffset (RE Tx path delay + RE Rx path delay + loopback delay) 47.815
Cable delay (T14 minus Toffset) 0.855
- User Guide 1
- CPRI MegaCore Function 1
- Contents 3
- Chapter 5. Testing Features 4
- ContentsContents v 5
- General Description 8
- CPRI IP Core Features 10
- Device Family Support 11
- MegaCore Verification 12
- Release Information 14
- Installation and Licensing 15
- OpenCore Plus Evaluation 16
- 2. Getting Started 17
- Specifying Parameters 18
- Simulation Files 19
- Simulating the Design 20
- Supporting the Transceivers 21
- Specifying Constraints 21
- 3. Parameter Settings 25
- Operation Mode Parameter 26
- Line Rate Parameter 26
- Enable Autorate Negotiation 27
- Rx Elastic Buffer Depth 27
- Include MAC Block 28
- Include HDLC Block 29
- Mapping Mode 29
- Application Layer Parameters 30
- Words” on page 4–42 32
- 4. Functional Description 33
- Architecture Overview 34
- CPRI IP Core Clocks 35
- Clocking Structure 36
- Notes to Table 4–2: 42
- Reset Requirements 43
- MegaCore 44
- Function 44
- MAP Interface Mapping Modes 45
- Basic AxC Mapping Mode 46
- MAP Interface 47
- Note to Table 4–5: 49
- Note to Table 4–6: 49
- Advanced AxC Mapping Modes 50
- MAP Receiver Interface 50
- Notes to Table 4–7: 51
- MAP Receiver in FIFO Mode 52
- MAP Transmitter Interface 56
- Notes to Table 4–10: 57
- MAP Transmitter in FIFO Mode 58
- Auxiliary Interface 62
- AUX Receiver Module 63
- Avalon-ST 32-bit interface 64
- AUX Transmitter Module 66
- Note to Figure 4–19: 67
- MII Transmitter 70
- MII Receiver 71
- CPU Interface 73
- Control Word Order 78
- Transmitting Ethernet Traffic 80
- Receiving Ethernet Traffic 81
- Accessing the HDLC Channel 82
- Note to Table 4–15: 83
- Features 84
- Physical Layer Architecture 84
- Receiver 85
- High-Speed Transceiver 86
- Rx Elastic Buffer 86
- Descrambling 87
- Frame Synchronization 87
- Alarm Indications 88
- Reset Control Word 89
- Transmitter 90
- Scrambling 91
- Tx Elastic Buffer 91
- External Loopback 93
- CPRI IP Core 93
- Internal Reverse Loopback 94
- Physical Layer Loopback Mode 94
- (1) (2) (3) 96
- MAP Receiver Signals 99
- 6–2 Chapter 6: Signals 100
- MAP Interface Signals 100
- MAP Transmitter Signals 101
- 6–4 Chapter 6: Signals 102
- Auxiliary Interface Signals 103
- AUX Receiver Signals 104
- AUX Transmitter Signals 105
- 6–8 Chapter 6: Signals 106
- Extended Rx Status Signals 107
- CPRI MII Receiver Signals 108
- CPRI MII Transmitter Signals 108
- CPU Interface Signals 109
- CPRI Data Signals 110
- Layer 1 Error Signal 111
- Autorate Negotiation Signals 111
- 6–14 Chapter 6: Signals 112
- Physical Layer Signals 112
- Transceiver Signals 113
- 6–16 Chapter 6: Signals 114
- Note to Table 6–14: 115
- 6–18 Chapter 6: Signals 116
- 7. Software Interface 117
- Note to Table 7–5: 119
- CPRI_HW_RESET 123
- register, refer to “Reset 123
- Requirements” on page 4–11 123
- Note to Table 7–13: 124
- Note to Table 7–16: 125
- Note to Table 7–17: 126
- Note to Table 7–20: 126
- Notes to Table 7–21: 127
- Notes to Table 7–28: 130
- Notes to Table 7–29: 130
- Note to Table 7–32: 133
- Note to Table 7–33: 133
- Note to Table 7–34: 133
- Note to Table 7–35: 134
- Note to Table 7–36: 134
- Notes to Table 7–37: 135
- Notes to Table 7–38: 135
- Notes to Table 7–39: 136
- Notes to Table 7–40: 136
- Note to Table 7–45: 137
- Ethernet Registers 138
- HDLC Registers 143
- Note to Figure 8–1: 150
- Test Sequence 151
- Running the Testbench 153
- A. Initialization Sequence 155
- Negotiation 157
- Notes for Figure B–1: 158
- Running Autorate Negotiation 159
- Notes to Table C–3: 167
- D. Advanced AxC Mapping Modes 173
- Fifteen-Bit Width Mode 175
- Sixteen-Bit Width Mode 176
- Note to Figure D–2: 177
- Delay Requirements 179
- RE SlaveREC Master 180
- Rx Path Delay 181
- Most CPRI IP Core Variations 181
- Single-Hop Delay Measurement 182
- Notes to Table E–1: 183
- Notes to Table E–2: 184
- Notes to Table E–3: 186
- Arria V GT 9.8 Gbps 188
- Notes to Table E–4: 189
- Tx Path Delay 190
- Note to Table E–6: 192
- T_txv_TX 194
- in Figure E–1 on page E–2 194
- Round-Trip Delay 196
- Round-Trip Cable Delay 196
- Families 202
- Round-Trip Delay Calculation 205
- Multi-Hop Delay Measurement 206
- Additional Information 213
- Document Revision History 214
- How to Contact Altera 218
- Typographic Conventions 218
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