Article ID: 000079289 Content Type: Error Messages Last Reviewed: 08/03/2023

WARNING: Attempting to read from uninitialized location

Environment

    Quartus® II Software
BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

You may experience the above warning when running a dual-rank DDR3 simulation.

This warning occurs during the memory initialization and calibration process. Uninitialized reads occur as the sequencer performs dummy reads to switch between shadow registers. The dummy read operations no longer occur after the memory calibration process is complete. 

Resolution

These warnings are harmless and should be ignored. The warnings don't occur in single-rank cases because shadow registers are disabled in those designs.

Related Products

This article applies to 19 products

Cyclone® V E FPGA
Arria® V SX SoC FPGA
Arria® V ST SoC FPGA
Arria® V GZ FPGA
Arria® V GX FPGA
Arria® V GT FPGA
Stratix® V GX FPGA
Cyclone® V ST SoC FPGA
Cyclone® V SX SoC FPGA
Stratix® V GS FPGA
Stratix® V GT FPGA
Cyclone® V GX FPGA
Stratix® III FPGAs
Stratix® IV E FPGA
Stratix® IV GT FPGA
Cyclone® V SE SoC FPGA
Stratix® IV GX FPGA
Stratix® V E FPGA
Cyclone® V GT FPGA

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