AN 701: Scalable Low Latency Ethernet 10G MAC using Intel Arria 10 1G/10G PHY

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ID 683343
Date 11/06/2017
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Document Table of Contents
Document Table of Contents x
Scalable Low Latency Ethernet 10G MAC using Intel Arria 10 1G/10G PHY
Scalable Low Latency Ethernet 10G MAC using Intel Arria 10 1G/10G PHY x
Features Requirements Design Example Walkthrough Components Parameters Design Example Testbench Clocking Scheme Reset Scheme Interface Signals Register Map Document Revision History for Scalable Low Latency Ethernet 10G MAC using Intel Arria 10 1G/10G PHY
Design Example Walkthrough x
Setting Up the Design Examples Changing Number of Channels Configuring PHY Speed IP Regeneration
Configuring PHY Speed x
Changing Speed between 10G and 1G in 1000BaseX mode Changing Speed between 1G, 100M, and 10M SGMII
Design Example Testbench x
Testbench Components Testbench Files Simulating Testbench Test Case
Simulating Testbench x
Using ModelSim Simulator Using VCS Simulator
Test Case x
Test Scenario for Design Example without IEEE 1588v2 Test Scenario for Design Example with IEEE 1588v2
Clocking Scheme x
Clocking Diagram Sync-E Support
Sync-E Support x
Enable Ref Clock Sharing Disable Ref Clock Sharing
Reset Scheme x
Design Example without IEEE 1588v2 Design Example with IEEE 1588v2
Design Example without IEEE 1588v2 x
Multi Channel Level Reset Scheme Channel Level Reset Scheme
Design Example with IEEE 1588v2 x
Multi Channel Level Reset Scheme Channel Level Reset Scheme
Interface Signals x
Clock and Reset Interface Signals Avalon-MM Interface Signals Avalon-ST Interface Signals PHY Interface Signals MDIO Interface Signals IEEE 1588v2 Timestamp Interface Signals Packet Classifier Interface Signals ToD Interface Signals
Register Map x
Master TOD 1G TOD 10G TOD PHY 1G/10G MAC
Scalable Low Latency Ethernet 10G MAC using Intel Arria 10 1G/10G PHY

Avalon-ST Interface Signals

The following table lists the Avalon-ST interface signals. These interface signals are applicable to both design examples.

Table 8.   Avalon-ST Interface Signals
Signal Direction Width Description
avalon_st_tx_startofpacket[] input [NUM_CHANNELS] Assert this signal to mark the beginning of the transmit data on the Avalon-ST interface.
avalon_st_tx_endofpacket[] input [NUM_CHANNELS] Assert this signal to mark the end of the transmit data on the Avalon-ST interface.
avalon_st_tx_valid[] input [NUM_CHANNELS] Assert this signal to indicate that avalon_st_tx_data[] and other signals on this interface are valid.
avalon_st_tx_ready[] output [NUM_CHANNELS] When asserted, this signal indicates that the MAC IP core is ready to accept data.
avalon_st_tx_error[][] input [NUM_CHANNELS][64] Assert this signal to indicate the current transmit packet contains errors.
avalon_st_tx_data[][] input [NUM_CHANNELS][3] Carries the transmit data from the client.
avalon_st_tx_empty[] input [NUM_CHANNELS] Use this signal to specify the number of bytes that are empty (not used) during cycles that contain the end of a packet.

0x0=All bytes are valid.

0x1=The last byte is invalid.

0x2=The last two bytes are invalid.

0x3=The last three bytes are invalid.

avalon_st_rx_startofpacket[] output [NUM_CHANNELS] When asserted, this signal marks the beginning of the receive data on the Avalon-ST interface.
avalon_st_rx_endofpacket[] output [NUM_CHANNELS] When asserted, this signal marks the end of the receive data on the Avalon-ST interface.
avalon_st_rx_valid[] output [NUM_CHANNELS] When asserted, this signal indicates that avalon_st_rx_data[]and other signals on this interface are valid.
avalon_st_rx_ready[] input [NUM_CHANNELS] Assert this signal when the client is ready to accept data.
avalon_st_rx_error[][] output [NUM_CHANNELS][64] When set to 1, the respective bits indicate an error type:
  • Bit 0—PHY error. For 10 Gbps, the data on xgmii_rx_data contains a control error character (FE). For 10 Mbps,100 Mbps,1 Gbps, gmii_rx_err or mii_rx_err is asserted.
  • Bit 1—CRC error. The computed CRC value differs from the received CRC.
  • Bit 2—Undersized frame. The receive frame length is less than 64 bytes.
  • Bit 3—Oversized frame. The receive frame length is more than MAX_FRAME_SIZE.
  • Bit 4—Payload length error. The actual frame payload length is different from the value in the length/type field.
  • Bit 5—Overflow error. The receive FIFO buffer is full while it is still receiving data from the MAC IP core.
avalon_st_rx_data[][] output [NUM_CHANNELS][3] Carries the receive data to the client.
avalon_st_rx_empty[][] output [NUM_CHANNELS][6] Contains the number of bytes that are empty (not used) during cycles that contain the end of a packet.
avalon_st_tx_status_valid[] output [NUM_CHANNELS] When asserted, this signal qualifies avalon_st_txstatus_data[] and avalon_st_txstatus_error[].
avalon_st_tx_status_data[][] output [NUM_CHANNELS][40] Contains information about the transmit frame.
  • Bits 0 to 15: Payload length.
  • Bits 16 to 31: Packet length.
  • Bit 32: When set to 1, indicates a stacked VLAN frame.
  • Bit 33: When set to 1, indicates a VLAN frame.
  • Bit 34: When set to 1, indicates a control frame.
  • Bit 35: When set to 1, indicates a pause frame.
  • Bit 36: When set to 1, indicates a broadcast frame.
  • Bit 37: When set to 1, indicates a multicast frame.
  • Bit 38: When set to 1, indicates a unicast frame.
  • Bit 39: When set to 1, indicates a PFC frame.
avalon_st_tx_status_error[][] output [NUM_CHANNELS][7] When set to 1, the respective bit indicates the following error type in the receive frame.
  • Bit 0: Undersized frame.
  • Bit 1: Oversized frame.
  • Bit 2: Payload length error.
  • Bit 3: Unused.
  • Bit 4: Underflow.
  • Bit 5: Client error.
  • Bit 6: Unused.
The error status is invalid when an overflow occurs.
avalon_st_rxstatus_valid[] output [NUM_CHANNELS] When asserted, this signal qualifies avalon_st_txstatus_data[] and avalon_st_txstatus_error[]. The MAC IP core asserts this signal in the same clock cycle avalon_st_rx_endofpacket is asserted.
avalon_st_rxstatus_data[][] output [NUM_CHANNELS][40] Contains information about the transmit frame.
  • Bits 0 to 15: Payload length.
  • Bits 16 to 31: Packet length.
  • Bit 32: When set to 1, indicates a stacked VLAN frame.
  • Bit 33: When set to 1, indicates a VLAN frame.
  • Bit 34: When set to 1, indicates a control frame.
  • Bit 35: When set to 1, indicates a pause frame.
  • Bit 36: When set to 1, indicates a broadcast frame.
  • Bit 37: When set to 1, indicates a multicast frame.
  • Bit 38: When set to 1, indicates a unicast frame.
  • Bit 39: When set to 1, indicates a PFC frame.
avalon_st_rxstatus_error[][] output [NUM_CHANNELS][7] When set to 1, the respective bit indicates the following error type in the receive frame.
  • Bit 0: Undersized frame.
  • Bit 1: Oversized frame.
  • Bit 2: Payload length error.
  • Bit 3: Unused.
  • Bit 4: Underflow.
  • Bit 5: Client error.
  • Bit 6: Unused.
The error status is invalid when an overflow occurs.
avalon_st_pause_data[][] input [NUM_CHANNELS][2] Set this signal to the following values to trigger the corresponding actions.
  • 0x0: Stops pause frame generation.
  • 0x1: Generates an XON pause frame.
  • 0x2: Generates an XOFF pause frame. The MAC IP core sets the pause quanta field in the pause frame to the value in the tx_pauseframe_quanta register.
  • 0x3: Reserved.
Note: This signal only takes effect if tx_pauseframe_enable[2:1] is 00 (default)
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