Flex Interface Modes - 1.3 English

Versal Devices Integrated 100G Multirate Ethernet MAC Subsystem Product Guide (PG314)

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1.3 English

The MRMAC features a flexible interface (Flex I/F) which permits the user logic to bypass the MAC logic and directly access the internal hardened resources of the MRMAC. Each port's Flex I/F can be configured to access a tap point to and from the internal MRMAC transmit/receive PCS datapath. In this approach, the Flex I/F of the port can be configured to any of the following:

  • BASE-R PCS n × 66b word interface (PCS/BASE-R mode)
  • FlexE PHY n × 66b word interface (FlexE mode)
  • Transparent PHY n × 66b interface (OTN mapping mode)
  • Direct access to the FEC resources (FEC only mode)

The Flex I/F can be configured into between one to four independent ports, supporting 4 × 10/25GE, 2 × 50GE, 1 × 40GE, or 1 × 100GE operation.

For each port, the ctl_data_rate field of the MODE_REG sets the operating data rate for the Flex I/F. For the TX direction, the ctl_tx_flexif_input_enable enables the Flex I/F input (disabling the AXI4-Stream input interface) and ctl_tx_flexif_select sets the operating mode, both fields are in the CONFIGURATION_TX_REG register. For the RX direction, the ctl_rx_flexif_select field of the CONFIGURATION_RX_REG register sets the RX Flex I/F mode.