Altera 10-Gbps Ethernet MAC MegaCore Function Bedienungsanleitung Seite 86
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Chapter 7: Functional Description 7–19
Congestion and Flow Control
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
7.7.2. Priority-Based Flow Control
This section describes the PFC frame reception and transmission. Follow these steps
to use the PFC:
1. Turn on the Priority-based flow control (PFC) parameter and specify the number
of priority levels using the Number of PFC priorities parameter. You can specify
between 2 to 8 PFC priority levels.
2. Set the following registers.
■ On the transmit datapath:
■ Set
tx_pauseframe_enable
to 0 to disable the IEEE 802.3 flow control.
■ Set
tx_pfc_priority_enable[n]
to 1 to enable the PFC for priority queue n.
■ On the receive datapath:
■ Set the
IGNORE_PAUSE
bit in the
rx_decoder_control register
to 1 to
disable the IEEE 802.3 flow control.
■ Set the
PFC_IGNORE_PAUSE_n
bit in the
rx_pfc_control
register to 0 to
enable the PFC.
3. Connect the
avalon_st_tx_pfc_gen_data
signal to the corresponding RX client
logic and the
avalon_st_rx_pfc_pause_data
signal to the corresponding TX client
logic.
4. You have the option to configure the MAC RX to forward the PFC frame to the
client by setting the
FWD_PFC
bit in the
rx_pfc_control
register to 1. By default, the
MAC RX drops the PFC frame after processing it.
7.7.2.1. PFC Frame Reception
When the MAC RX receives a PFC frame from the remote partner, it asserts the
avalon_st_rx_pfc_pause_data[n]
signal if Pause Quanta n is valid (Pause Quanta
Enable [n] = 1) and greater than 0. The client suspends transmission from the TX
priority queue n for the period specified by Pause Quanta n. If the MAC RX asserts
the
avalon_st_rx_pfc_pause_data[n]
signal in the middle of a client frame
transmission for the TX priority queue n, the client finishes sending the current frame
and then suspends transmission for the queue.
When the MAC RX receives a PFC frame from the remote partner, it deasserts the
avalon_st_rx_pfc_pause_data[n]
signal if Pause Quanta n is valid (Pause Quanta
Enable [n] = 1) and equal to 0. The MAC RX also deasserts this signal when the timer
expires. The client resumes transmission for the suspended TX priority queue when
the
avalon_st_rx_pfc_pause_data[n]
signal is deasserted.
When the remote partner sends more than one pause quanta for the TX priority queue
n, the MAC RX sets the pause quanta n to the last pause quanta received from the
remote partner.
f For more information on the PFC pause frame, refer to Appendix A.4, Priority-Based
Flow Control Frame.
- 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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