F-tile Architecture and PMA and FEC Direct PHY IP User Guide

ID 683872
Date 12/15/2021
Public

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6.2.3. Setting RX Datapath Options

Specify options for the following on the F-Tile PMA/FEC Direct PHY Intel® FPGA IP parameter editor RX Datapath Options tab:

  • RX FGT CDR
  • RX datapath FIFO modes

The design specifies the following RX Datapath Options:

Table 98.  RX FGT CDR Options
Parameter Parameter Value
RX FGT CDR reference clock frequency Select 156.25MHz. The RX FGT CDR reference clock frequency must match the reference clock frequency that the F-Tile Reference and System PLL Clocks Intel® FPGA IP specifies. To connect the out_refclk_fgt_0 to this IP, refer to Connecting the F-tile PMA/FEC Direct PHY Design IP
Figure 99. RX FGT CDR Options
Table 99.  RX PMA Interface Options
Parameter Parameter Value
RX PMA interface FIFO mode Elastic
RX core Interface FIFO Mode Phase Compensation
Enable RX double width transfer On
Note: When you enable this option, you must drive the tx_clkout source with Sys PLL Clk Div2 source instead of sys PLL clk source. Divide the core clocking frequency by two in this way to avoid exceeding the maximum EMIB to core frequency specification.

The RX F-tile Interface FIFO mode is always designed to be in Register mode for PMA direct mode, and you cannot select a different option for this IP.

Figure 100. RX PMA Interface Options

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