L- and H-Tile Transceiver PHY User Guide

ID 683621
Date 7/20/2022
Public
Document Table of Contents

2.4.4.4.2. Preserving ODI Performance

Performance of ODI circuit of a GXT channel can degrade over time if you do not enable the ODI circuit full time during the GXT channel operation. If ODI feature is required during the GXT channel operation, enable the ODI circuit full time to preserve the ODI circuit performance. You do not need to perform an eye scan to preserve the performance. After 3 years, the ODI circuit performance at GXT data rates may not be preserved even if you enable the ODI circuit full time.

There are two methods to enable the ODI circuit full time. The first method is by setting 0x168[2] and 0x168[0] to 0x1 through the Avalon® memory-mapped interface for each GXT channel. The second method is by implementing the following Intel® Quartus® Prime software (.qsf) settings for each GXT channel.

set_instance_assignment -name HSSI_PARAMETER "pma_adapt_adp_odi_en=RADP_ODI_EN_ENABLE" -to <rx_serial_data input port> -entity <top level entity name>

set_instance_assignment -name HSSI_PARAMETER "pma_adapt_adp_odi_start=RADP_ODI_START_1" -to <rx_serial_data input port> -entity <top level entity name>

set_instance_assignment -name HSSI_PARAMETER "pma_adapt_odi_mode=ODI_ENABLE" -to <rx_serial_data input port> -entity <top level entity name>

For example, if the GXT channel receiver pin port name is gxt_rx_serial[0] and the top level entity of the project is top_gxt, you must structure the assignments with the following syntax:

set_instance_assignment -name HSSI_PARAMETER "pma_adapt_adp_odi_en=RADP_ODI_EN_ENABLE" -to gxt_rx_serial[0] -entity top_gxt

set_instance_assignment -name HSSI_PARAMETER "pma_adapt_adp_odi_start=RADP_ODI_START_1" -to gxt_rx_serial[0] -entity top_gxt

set_instance_assignment -name HSSI_PARAMETER "pma_adapt_odi_mode=ODI_ENABLE" -to gxt_rx_serial[0] -entity <top level top_gxt

For GX channels that are dynamically reconfigured to GXT mode, and if ODI feature is required during GXT mode, enable the ODI circuit full time whether in GX or GXT mode.

Performance of ODI circuit of a GX channel at data rates 17.4 Gbps and below is not affected.

Note: Enabling the ODI circuit full time causes power increase of about 90 mW on VCCR_GXB and 70 mW on VCCH_GXB per channel.

Did you find the information on this page useful?

Characters remaining:

Feedback Message