Intel® Cyclone® 10 GX Transceiver PHY User Guide

ID 683054
Date 4/14/2023
Document Table of Contents

7.2.5. Capability Registers

Capability registers allow you to read calibration status through the Avalon-MM reconfiguration interface. They are soft logic and reside in the FPGA fabric.

Reading capability registers does not require bus arbitration. You can read them during the calibration process.

To use capability registers to check calibration status, you must enable the capability registers when generating the Native PHY or PLL IP cores. To enable the capability registers, select the Enable capability registers option in the Dynamic Reconfiguration tab.

The tx_cal_busy and rx_cal_busy signals from the hard PHY are from the same hardware and change state (high/low) concurrently during calibration. The register bits 0x281[5:4] are defined to solve this issue. This prevents a TX channel being affected by RX calibration, or an RX channel being affected by TX calibration. This feature cannot be enabled, when a Simplex TX and Simplex RX channel merging is involved. To merge a Simplex TX and a Simplex RX channel into one physical channel, refer to Dynamic Reconfiguration Interface Merging Across Multiple IP Blocks.