Forum Discussion

JDlug's avatar
JDlug
Icon for New Contributor rankNew Contributor
5 years ago

Issue with Quartus Prime PRO for Stratix 10 when using a string type in a VHDL project.

Hello, When using "Quartus Prime Pro 20.1" software with "Stratix 10" chip, I have a problem with VHDL string type in my projects. At the same time, I don't have this problem when using "Quartus Pri...
KhaiChein_Y_Intel's avatar
KhaiChein_Y_Intel
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi JD,

I received the feedback from the team. This error is due to not all ASCII characters are readable and we do not support that in Quartus. Internal error will occur when user trying to create a name for that. Is there any reasons why do you want to use characters in your design ? Could you use some other data type to achieve the goal?

Thanks.

Best regards,

KhaiY

JDlug's avatar
JDlug
Icon for New Contributor rankNew Contributor
5 years ago

Hi KhaiY,

Thank you for your respons. I am sorry that I did not answer faster, but your reply did not reach my mailbox at all. I just noticed it here.

You wrote:

> This error is due to not all ASCII characters are readable

I am sorry but I don't understand this explanation. It must be some kind of misunderstanding. What does it mean: "not all ASCII characters are readable"? Are we talking about OCR or about VHDL language? An ASCII character is nothing more but one byte (logic vector of eight bits)! You can't read some bits if the type is STRING and you can read them when the type is STD_LOGIC_VECTOR? I am completely lost here. I really don’t get it!

> and we do not support that in Quartus.

Does the Quartus team really say that? The engineers? But it's really not true! I know you do support that in Quartus! How is it possible that they say so? You can check it easily by yourself. The same simple example code I put here before, compiles correctly without any problems in Quartus Prime when you choose the MAX10 chip instead of the Stratix 10. It seems to me that the issue concerns only the "Stratix 10 device support". Did I misunderstand something?

> Internal error will occur when user trying to create a name for that.

I am sorry I don't understand this sentence. English is not my native language. Could you please explain it to me with another words?

> Is there any reasons why do you want to use characters in your design ?

Yes of course. For some applications, it is much better to use STRING type. I am working on projects where I need to analyze incoming text and create another text responses. In such cases, the use of STRING type makes coding much easier.

> Could you use some other data type to achieve the goal?

Yes, I could but it would be a nightmare for me. I already have a lot of code with STRING type in my projects. It would be months of work to modify everything. The situation is this: I just bought a very expensive evaluation kit containing Intel Stratix 10 FPGA and now I can't use my projects on it! I am depressed. :-( This is now the second problem that I have with Stratix 10 in a short time. Please help me with this and don't tell me you do not support something that is standard for the VHDL language.

Best Regards,

(jd)