Quartus 22.1 and 23.1 Synthesis Error
Hi, I am currently working on a project targeting a Cyclone V device using Quartus Prime versions 22.1 and 23.1. The design compiles and functions correctly with no issues. However, after adding an FFT IP core, Quartus frequently fails during synthesis with the error shown below. The issue is reproducible in both Quartus versions. Interestingly, the compilation succeeds only intermittently (approximately once every 5–6 attempts), while most synthesis runs fail. Another observation is that if I change the Synthesis Effort setting to Fast, the design compiles successfully every time. Has anyone encountered similar behaviour or have any suggestions on how to work around this issue? Thanks in advance.
quartus pro 25.3 bug?
Now I am developing a project with agilex7 base on the quartus pro 25.3. the project contains R-TILE pcie hard ip and F-tile ethernet hard ip. During board bring-up debugging, we frequently encounter non-deterministic discrepancies between actual hardware behavior and simulation results. For instance, on a certain platform, the PCIe device fails to be enumerated by the host. Probing the Avalon-ST TX interface of the PCIe hard IP reveals continuous toggling on both the hvld and dvalid signals. However, we have verified that no traffic is being sourced to this interface, meaning these two signals should theoretically remain idle without constant toggling. And the timing of the project is cleaning. How should we proceed to troubleshoot this issue? Should we try upgrading the Quartus version as a potential solution?Quartus crashes on long carry chain in Agilex 5 FPGAs
We try to manually place a carry chain in the Agilex 5 FPGAs which consists of more than 40 LABs. When we place this carry chain using set_location_assignment, Quartus crashes during the placement phase whenever the carry chain is longer than 40 LABs. Is it expected that the carry chain cannot be made longer than 40 LABs in the Agilex 5 FPGAs? Crash was observed on Quartus 25.3 and Quartus 26.1 for the devices A5ED065BB32AE4S and A5ED013BB32AE4SCS. Internal Error: Sub-system: FLABS, File: /quartus/fitter/flabs/flabs_util.cpp, Line: 96 p_to_fill->next == FLABS_OPEN
