RapidIO Intel FPGA IP User Guide

ID 683884
Date 9/15/2021
Public
Document Table of Contents

2.9.2. Clock and Signal Requirements for Arria II GX, Arria II GZ, Cyclone IV GX, and Stratix IV GX Variations

RapidIO IP cores that target an Arria II GX, Arria II GZ, Cyclone IV GX, or Stratix IV GX device all instantiate an ALTGX transceiver megafunction to configure the device transceivers. When your design contains multiple IP cores that use the ALTGX megafunction, you must ensure that the cal_blk_clk and gxb_powerdown input signals are connected properly.

You must ensure that the cal_blk_clk input to each RapidIO IP core (or any other megafunction or user logic that uses the ALTGX megafunction) is driven by the same calibration clock source.

When you merge multiple RapidIO IP cores in a single transceiver block, the same signal must drive gxb_powerdown to each of the RapidIO IP core variations and other megafunctions, IP cores, and user logic that use the ALTGX megafunction.

To successfully combine multiple high-speed transceiver channels in the same transceiver block, they must have the same dynamic reconfiguration setting. If two IP cores implement dynamic reconfiguration in the same transceiver block of an Arria II GX, Arria II GZ, Cyclone IV GX, or Stratix IV GX device, the parameters or characteristics that you want to control with the dynamic reconfiguration megafunction instance must be identical.

To support the dynamic reconfiguration block, turn on Analog controls on the Reconfiguration Settings tab in the transceiver parameter editor. Arria II GX, Arria II GZ, Cyclone IV GX, and Stratix IV GX device transceivers require a dynamic reconfiguration block, to support offset cancellation.