JESD204B Intel® Cyclone® 10 GX FPGA IP Design Example User Guide

ID 683298
Date 10/14/2022
Document Table of Contents ATX PLL

Note: This module is only available in the design example when the duplex or simplex TX data path option is selected.

The ATX PLL is a standard Platform Designer component in the IP Catalog standard library. This module supplies a low-jitter serial clock to the transceiver PHY module. The reference clock input to the ATX PLL comes from an external source. If the transceiver dynamic reconfiguration option is selected during design example generation, the ATX PLL has an Avalon® memory-mapped interface that connects to the Avalon® master (JTAG to Avalon® master bridge for System Console control via the Avalon® memory-mapped interconnect and can receive configuration instructions from the Avalon® master.

For simplex TX variant, the frequency selection in the PLL/CDR Reference Clock Frequency drop-down list in the JESD204B IP parameter editor is disabled. The design example generates the ATX PLL with the reference clock frequency of either:

  • Hard PCS: data_rate/20
  • Soft PCS: data_rate/40

Refer to Changing the Data Rate or Reference Clock Frequency for more information about modifying the ATX PLL reference clock frequency to suit your application.

For duplex variant, the ATX PLL and CDR share the same reference clock pin. You must select the frequency from the PLL/CDR Reference Clock Frequency drop-down list in the IP parameter editor.

For the ATX PLL reference clock frequencies supported range, refer to the Intel® Cyclone® 10 GX Device Datasheet.