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

ID 683872
Date 7/08/2024
Public
Document Table of Contents

3.4.2. TX and RX Reference Clock and Clock Output Interface Signals

Table 46.  TX and RX Reference Clock and Clock Output Interface SignalsRefer to Variables Defining Bits for the Interfacing Ports in Port and Signal Reference for variable definitions.
Signal Name Clocks Domain/Resets Direction Description

rx_clkout [(N*X)-1:0]

rx_clkout2 [(N*X)-1:0]]

tx_clkout [(N*X)-1:0]

tx_clkout2 [(N*X)-1:0]

N/A output Refer to Clock Ports
Note:

It is recommended to always use bit[0] to drive tx_coreclkin[N*X-1:0] and rx_coreclkin[N*X-1:0]. When X is larger than 1, bit [((n+1)*X)-1: (n*X)+1] does not have valid output and must not be used.

For example, when PMA width = 64, X = 2:
  • If N=1, n=0: bit 1 does not have valid output and must not be used.
  • If N=8, n=0 to 7: bits 1, 3, 5, 7, 9, 11, 13, 15 do not have valid output and must not be used.
when PMA width = 128, X = 4:
  • If N=1, n=0: bits 1, 2, 3 do not have valid output and must not be used.
  • If N=4, n=0 to 3: bits 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15 do not have valid output and must not be used.
tx_coreclkin [N*X-1:0] N/A input The FPGA core clock. Drives the write side of the TX FIFO.
rx_coreclkin [N*X-1:0] N/A input The FPGA core clock. Drives the read side of the RX FIFO.
tx_pll_refclk_link [N-1:0] 26
Note: This signal is single bit when Enable TX FGT PLL cascade mode is enabled.
N/A input This is neither physical nor logical pin. You connect this to <out_refclk_fgt_<X> > port from the F-Tile Reference and System PLL Clocks Intel® FPGA IP 27. The N-bit ports must connect to the same source.
rx_cdr_refclk_link [N-1:0]
Note: This signal is not available when Enable TX FGT PLL cascade mode is enabled.
N/A input This is neither physical nor logical pin. You connect this to <out_refclk_fgt_<X> > port from the F-Tile Reference and System PLL Clocks Intel® FPGA IP 27. The N-bit ports must connect to the same source.
system_pll_clk_link N/A input This is neither physical nor logical pin. You connect this to <out_systempll_clk_0 > port from the F-Tile Reference and System PLL Clocks Intel® FPGA IP 27.
tx_pll_locked [N-1:0] asynchronous output TX PLL locked signal for both FGT and FHT to reference clock within the PPM threshold status signal. 1’b1 = locked. 1’b0 = not locked.
rx_cdr_divclk_link0 N/A output Clock output from FGT CDR divided clock. This signal is used for CPRI. F-tile includes a total of two such pins. This port is neither physical nor logical pin. If you enable, you must set the number of system copies to 1. This port must connect to the out_cdrclk port of the F-Tile Reference and System PLL Clocks Intel® FPGA IP . This port cannot be enabled in a quad that has primary PLL configuration27. This signal is not supported for FHT.
26 Ports ending in "_link" must connect to the F-Tile Reference and System PLL Clocks Intel® FPGA IP. These ports cannot be simulated.
27 Refer to Guidelines for F-Tile Reference and System PLL Clocks Intel FPGA IP Usage for reference clock and system PLL usage.