100G Interlaken Intel® FPGA IP User Guide

ID 683338
Date 10/31/2022
Public
Document Table of Contents

5.1. 100G Interlaken IP Core Clock Interface Signals

Table 15.   100G Interlaken IP Core Clock Interface

Signal Name

Direction

Width (Bits)

Description

Clock Ports

pll_ref_clk

Input

1

Transceiver reference clock for the RX CDR PLL in IP core variations that target an Intel® Arria® 10 device. Transceiver reference clock for the RX CDR PLL and the TX transceiver PLL in all other variations.

Table 16.  100G Interlaken IP Core Supported pll_ref_clk FrequenciesThe sets of valid frequencies vary with the per-lane data rate of the transceivers.

Per-Lane Data Rate

Valid pll_ref_clk Frequencies (MHz)

10.3125

206.25, 257.8125, 322.265625, 412.5, 515.625, 644.53125

12.5, 6.25

156.25, 195.3125, 250, 312.5, 390.625, 500, 625

The pll_ref_clk input clock frequency must match the value you specify for the Transceiver reference clock frequency parameter.

tx_serial_clk

Input

NUM_LANES–

Clocks for the individual transceiver channels in 100G Interlaken IP core variations that target an Intel® Arria® 10 device.

clk_tx_common

Output

1

PCS common lane clock driven by the SERDES transmit PLL. The clock rate is the lane rate divided by 40 bits. The clk_tx_common frequency is 156.25 MHz for 6.25 Gbps, 257.8 MHz for 10.3125 Gbps, and 312.5 MHz for 12.5 Gbps per lane.

clk_rx_common

Output

1

Master recovered lane clock. The Interlaken specification requires all incoming lanes to run at the same frequency.

tx_usr_clk

Input

1

Transmit side user data interface clock. To achieve 100 Gbps Ethernet traffic throughput, you must run this clock at one of the following minimum frequencies:

  • 225 MHz in dual segment mode, 12-lane variations
  • 300 MHz in single segment mode and in 24-lane variations

rx_usr_clk

Input

1

Receive side user data interface clock. To achieve 100 Gbps Ethernet traffic throughput, you must run this clock at one of the following minimum frequencies:

  • 225 MHz in dual segment mode, 12-lane variations
  • 300 MHz in single segment mode and in 24-lane variations
mm_clk

Input

1

Management clock. Clocks the register accesses. It is also used for clock rate monitoring and some analog calibration procedures. You must run this clock at a frequency in the range of 100 MHz–125 MHz.

reconfig_clk

Input

1 Clocks the Intel® Arria® 10 transceiver reconfiguration interface. This clock is available only in IP core variations that target an Intel® Arria® 10 device. You should run this clock at a frequency of 100 MHz.
Note: If you change the port name or period of a clock, then you must modify .sdc file to match the corresponding changes.