Tool Compatibility
This section presents an overview of known issues with different simulators.
GHDL
AXI-Stream: GHDL crashes due to a memory allocation error when instantiating an AXI-Stream VVC.
Detected in version |
Fixed in |
Notes |
|---|---|---|
GHDL 5.0.0-dev (4.0.0.r24.g14b411c57) UVVM v2 2024.03.08 |
Workaround in UVVM v2 2024.07.03 |
Modelsim / Questa
Functional Coverage: Using sample_coverage() with transition bins can cause a false match.
Detected in version |
Fixed in |
Notes |
|---|---|---|
Modelsim PE 2023.1 |
Modelsim PE 2024.2 |
Workaround in UVVM v2 2024.03.08 |
Questa Sim version 19.2 and Modelsim version 19.2 have known bugs that might prevent UVVM from working properly.
NVC
SPI: NVC does not return the correct timestamp when using the last_active attribute during a “wait until” statement.
Detected in version |
Fixed in |
Notes |
|---|---|---|
NVC 1.14.0 (1.14.0.r33.gbb35ff9a) (Using LLVM 18.1.6) |
Workaround in UVVM v2 2025.08.18 |
Riviera-PRO
.