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2.1. Installation and Licensing for LL 100GbE IP Core for Stratix® V Devices
2.2. Installing and Licensing Intel® FPGA IP Cores
2.3. Specifying the IP Core Parameters and Options
2.4. IP Core Parameters
2.5. Files Generated for Stratix V Variations
2.6. Files Generated for Arria 10 Variations
2.7. Integrating Your IP Core in Your Design
2.8. IP Core Testbenches
2.9. Compiling the Full Design and Programming the FPGA
2.10. Initializing the IP Core
2.7.1. Pin Assignments
2.7.2. External Transceiver Reconfiguration Controller Required in Stratix V Designs
2.7.3. Transceiver PLL Required in Arria 10 Designs
2.7.4. Handling Potential Jitter in Intel® Arria® 10 Devices
2.7.5. External Time-of-Day Module for Variations with 1588 PTP Feature
2.7.6. External TX MAC PLL
2.7.7. Placement Settings for the LL 100GbE Core
3.2.1. LL 100GbE IP Core TX Datapath
3.2.2. LL 100GbE IP Core TX Data Bus Interfaces
3.2.3. LL 100GbE IP Core RX Datapath
3.2.4. LL 100GbE IP Core RX Data Bus Interfaces
3.2.5. Low Latency 100GbE CAUI–4 PHY
3.2.6. External Reconfiguration Controller
3.2.7. External Transceiver PLL
3.2.8. External TX MAC PLL
3.2.9. Congestion and Flow Control Using Pause Frames
3.2.10. Pause Control and Generation Interface
3.2.11. Pause Control Frame Filtering
3.2.12. Link Fault Signaling Interface
3.2.13. Statistics Counters Interface
3.2.14. 1588 Precision Time Protocol Interfaces
3.2.15. PHY Status Interface
3.2.16. Transceiver PHY Serial Data Interface
3.2.17. Control and Status Interface
3.2.18. Arria 10 Transceiver Reconfiguration Interface
3.2.19. Clocks
3.2.20. Resets
3.2.2.1. LL 100GbE IP Core User Interface Data Bus
3.2.2.2. LL 100GbE IP Core TX Data Bus with Adapters (Avalon-ST Interface)
3.2.2.3. LL 100GbE IP Core TX Data Bus Without Adapters (Custom Streaming Interface)
3.2.2.4. Bus Quantization Effects With Adapters
3.2.2.5. User Interface to Ethernet Transmission
3.2.3.1. LL 100GbE IP Core RX Filtering
3.2.3.2. LL 100GbE IP Core Preamble Processing
3.2.3.3. LL 100GbE IP Core FCS (CRC-32) Removal
3.2.3.4. LL 100GbE IP Core CRC Checking
3.2.3.5. LL 100GbE IP Core Malformed Packet Handling
3.2.3.6. RX CRC Forwarding
3.2.3.7. Inter-Packet Gap
3.2.3.8. RX RSFEC
3.2.3.9. Pause Ignore
3.2.3.10. Control Frame Identification
3.4.1.1. PHY Registers
3.4.1.2. Link Fault Signaling Registers
3.4.1.3. LL 100GbE IP Core MAC Configuration Registers
3.4.1.4. Pause Registers
3.4.1.5. TX Statistics Registers
3.4.1.6. RX Statistics Registers
3.4.1.7. 1588 PTP Registers
3.4.1.8. TX Reed-Solomon FEC Registers
3.4.1.9. RX Reed-Solomon FEC Registers
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3.2.9.1. Conditions Triggering XOFF Frame Transmission
The LL 100GbE IP core supports retransmission. In retransmission mode, the IP core retransmits a XOFF frame periodically, extending the pause time, based on signal values.
The TX MAC transmits XOFF frames when one of the following conditions occurs:
- Client requests XOFF transmission—A client can explicitly request that XOFF frames be sent using the pause control interface signal. When pause_insert_tx is asserted, an XOFF frame is sent to the Ethernet network when the current frame transmission completes.
- Host (software) requests XOFF transmission—Setting the pause request register triggers a request that an XOFF frame be sent.
- Retransmission mode—If the retransmit hold-off enable bit has the value of 1, and the pause_insert_tx signal remains asserted or the pause request register value remains high, when the time duration specified in the hold-off quanta register has lapsed after the previous XOFF transmission, the TX MAC sends another XOFF frame to the Ethernet network. While the IP core is paused in retransmission mode, you cannot use either of the other two methods to trigger a new XOFF frame: the signal or register value is already high.
Note: Intel recommends that you use the pause_insert_tx signal to backpressure the remote Ethernet node.
Note: Intel recommends that you set and maintain the value of the retransmit hold-off enable bit at 1 to control the rate of XOFF pause frame transmission.