Error: E:/modelsim/examples/monitor.v(22): Register is illegal in left-hand side of continuous assignment

这个错误是因为在 continuous assignment（连续赋值）语句中使用了寄存器类型的变量作为左值。在 SystemVerilog 中，寄存器类型的变量只能在过程块中赋值，不能在连续赋值语句中使用。你需要将寄存器类型的变量改为 wire 类型的变量，或者将连续赋值语句改为 always 块中的赋值语句。

相关问题

# ** Error: D:/Download/software/Modelsim/win64/vlog failed.

这个错误是指在 ModelSim 编译 Verilog 代码时出现了问题。可能的原因是：

1. ModelSim 安装有问题或者没有正确配置。

2. Verilog 代码中存在语法错误或者编码问题。

3. Verilog 代码中存在未定义的变量或者模块。

4. Verilog 代码中使用了不兼容的语法或者标准。

你可以尝试以下步骤来解决这个问题：

1. 确认 ModelSim 安装完整并且配置正确。

2. 检查 Verilog 代码中是否存在语法错误或者编码问题。

3. 确认 Verilog 代码中所有变量和模块都已经正确定义。

4. 确认 Verilog 代码符合你使用的标准或者语法。

如果以上步骤都没有解决问题，你可以尝试重新安装 ModelSim 或者在网上搜索相关解决方案。

ModelSim executable not found in C:/intelFPGA/18.1/modelsim_ase/ Error.

The error message indicates that the ModelSim executable file cannot be found in the specified directory. This can occur due to a variety of reasons, such as incorrect installation or configuration settings.

Here are some possible solutions:

1. Check if the directory path is correct and make sure that ModelSim is installed in the specified directory.
2. Ensure that the environment variables for ModelSim are set correctly. To do this, go to Control Panel -> System -> Advanced System Settings -> Environment Variables and add the path to the ModelSim executable to the PATH variable.
3. Try reinstalling ModelSim and make sure to follow the installation instructions carefully.
4. If you are using a 64-bit operating system, make sure that you have installed the 64-bit version of ModelSim.

If none of these solutions work, you may need to contact Intel FPGA support for further assistance.