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Chapter 9: Interface Signals 9–25
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
9.0.9.2. ToD Clock Interface Signals
Table 9–13 describes the ToD clock interface signals for the IEEE 1588v2 feature.
9.0.9.3. Path Delay Interface Signals
Table 9–14 describes the path delay interface signals for the IEEE 1588v2 feature.
Table 9–13. ToD Clock Interface Signals
Signal Direction Width Description
tx_time_of_day_96b_10g_data
(in 10 Gbps mode)
tx_time_of_day_96b_1g_data
(in 1 Gbps, 10 Mbps, and 100 Mbps mode)
Input 96
Use this bus to carry the time-of-day from external
ToD module to 96-bit MAC TX clock.
Consists of 48-bit seconds field, 32-bit
nanoseconds field, and 16-bit fractional
nanoseconds field
rx_time_of_day_96b_10g_data
(in 10 Gbps mode)
rx_time_of_day_96b_1g_data
(in 1 Gbps, 10 Mbps, and 100 Mbps mode)
Input 96
Use this bus to carry the time-of-day from external
ToD module to 96-bit MAC RX clock.
Consists of 48-bit seconds field, 32-bit
nanoseconds field, and 16-bit fractional
nanoseconds field
tx_time_of_day_64b_10g_data
(for 10 Gbps mode)
tx_time_of_day_64b_1g_data
(in 1 Gbps, 10 Mbps, and 100 Mbps mode)
Input 64
Use this bus to carry the time-of-day from ToD
clock to 64-bit MAC TX clock.
Consists of 48-bit nanoseconds field and 16-bit
fractional nanoseconds field
rx_time_of_day_64b_10g_data
(in 10 Gbps mode)
rx_time_of_day_64b_1g_data
(in 1 Gbps, 10 Mbps, and 100 Mbps mode)
Input 64
Use this bus to carry the time-of-day from external
ToD module to 64-bit MAC RX clock.
Consists of 48-bit nanoseconds field and 16-bit
fractional nanoseconds field
Table 9–14. Path Delay Interface Signals
Signal Direction Width Description
tx_path_delay_10g_data
(in 10 Gbps mode)
Input 16
Connect this bus to the Altera PHY IP. This bus
carries the path delay on the transmit datapath.
The delay is measured between the physical
network and XGMII SDR. The delay is used to
adjust the egress timestamp.
Consists of:
■ Bits 0 to 9: Fractional number of clock cycle
■ Bits 10 to 15: Number of clock cycle
tx_path_delay_1g_data
(in 1 Gbps, 10 Mbps, and 100 Mbps mode)
Input 22
Connect this bus to the Altera PHY IP. This bus
carries the path delay on the transmit datapath.
The delay is measured between the physical
network, and GMII and MII. The delay is used to
adjust the egress timestamp.
Consists of:
■ Bits 0 to 9: Fractional number of clock cycle
■ Bits 10 to 21: Number of clock cycle
- User Guide 1
- Contents 3
- Contents iv 4
- Chapter 8. Registers 5
- Chapter 9. Interface Signals 5
- 1. About This IP Core 7
- 1.2. Release Information 8
- 1.3. Device Family Support 9
- 1.4. IP Core Verification 10
- ■ Timestamping is enabled 12
- ■ ptp_1step is disabled 12
- 2.2. Design Flows 14
- 2.3.2. Simulate the IP Core 15
- 2.4.1. Specify Parameters 16
- 2.4.3. Simulate the System 17
- [1] register bit to 1 18
- 3. 10GbE MAC Design Examples 19
- 3.2.0.2. Base Addresses 22
- Table 3–5 on page 3–10 23
- Creating a New 10GbE Design 24
- 3.6. 10GbE Testbenches 26
- 3.6.3. 10GbE Testbench Files 27
- 10GbE Testbenches 28
- Notes to Table 3–6: 36
- 4.1. Software Requirements 39
- Altera FPGA 40
- Design Example 40
- 4.2.1. Base Addresses 41
- Figure 4–3. Testbench 43
- The <ip 44
- Simulator 45
- 5.2.2. Base Addresses 49
- 1G/10GbE Design Example Files 50
- 5.5. 1G/10GbE Testbench 51
- Testbench 52
- 1G/10GbE Testbench 53
- 5.5.4.2. Backplane-KR Mode 55
- 6.2.1. Base Addresses 62
- ModelSim Simulator 66
- 7. Functional Description 68
- Architecture 69
- 7.2. Interfaces 70
- 7.2.2. SDR XGMII 71
- 7.2.3. GMII 71
- 7.2.4. MII 71
- 7.3. Frame Types 72
- 7.4. Transmit Datapath 72
- 7.4.2. Address Insertion 73
- Note to Figure 7–5: 74
- 7.4.4. XGMII Encapsulation 75
- 7.4.6. SDR XGMII Transmission 76
- Figure 7–7. Endian Conversion 77
- 7.5. Receive Datapath 78
- 7.5.4. Address Checking 79
- 7.5.5. Frame Type Checking 79
- 7.5.6. Length Checking 80
- 7.5.7. CRC-32 and Pad Removal 81
- 7.5.8. Overflow Handling 82
- Congestion and Flow Control 83
- 7.7.2.1. PFC Frame Reception 86
- Figure 7–11. Fault Signaling 87
- 7.9. IEEE 1588v2 88
- IEEE 1588v2 89
- 7.9.1. Architecture 90
- 7.9.2. Transmit Datapath 91
- 7.9.3. Receive Datapath 92
- 7.9.4. Frame Format 92
- MAC Header 93
- Note to Figure 7–16: 94
- 8. Registers 95
- 8.1. MAC Registers 96
- 0x0C1. Bits 4 to 31 are 98
- 0x0C3. Bits 4 to 31 are 98
- Register Name Access 100
- Bits 4 to 31 are reserved 101
- register 111
- Name R/W Description 112
- 8.3. Register Initialization 113
- 8–20 Chapter 8: Registers 114
- Register Initialization 114
- Chapter 8: Registers 8–21 115
- 8–22 Chapter 8: Registers 116
- Chapter 8: Registers 8–23 117
- 8–24 Chapter 8: Registers 118
- Chapter 8: Registers 8–25 119
- 9. Interface Signals 120
- Note to Table 9–1: 121
- Note to Figure 9–2: 123
- Note to Figure 9–3: 123
- Notes to Figure 9–4: 124
- Note to Figure 9–5: 125
- 9.0.3. SDR XGMII 127
- Note to Figure 9–7: 128
- Note to Figure 9–8: 129
- 9.0.4. GMII Signals 130
- 9.0.5. MII Signals 130
- Note to Table 9–8: 136
- Note to Table 9–9: 139
- 1588v2 feature 142
- 10. Design Considerations 150
- 10GbE MAC XAUI/10G BASE-R PHY 151
- Reconfiguration Controller 151
- A. Frame Format 153
- Figure A–2. VLAN Frame Format 154
- A.3. Pause Frame 155
- Figure A–5. PFC Frame Format 156
- B. Time-of-Day (ToD) Clock 157
- B.4. Parameter Setting 158
- ■ Bits 20 to 31: Not used 160
- B.6.1. Adjusting ToD’s Drift 161
- C. Packet Classifier 162
- Classifier 163
- D. ToD Synchronizer 166
- D.2. Block Diagram 167
- D.4. ToD Synchronizer Signals 169
- Additional Information 171
- Info–2 Additional Information 172
- Document Revision History 172
- Additional Information Info–3 173
- How to Contact Altera 174
- Typographic Conventions 174
- Additional Information Info–5 175
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