User Guide: DSim Lexical Conventions

Modified on Wed, 24 Apr at 8:17 AM

User Guide: DSim Lexical Conventions

Treatment of Non-ASCII Characters

VHDL is defined to use the 8-bit character set ISO8859-1. Verilog and SystemVerilog do not specify the character set at all, although "ASCII" is mentioned, as well as "printable ASCII" in the range 33-126 decimal for use in escaped identifiers.

Strictly speaking, if 7-bit ASCII is to be assumed, then characters outside that range must be rejected, even in comments. However, we have seen code with non-ASCII characters (e.g. the copyright symbol) in comments.

DSim accepts any 8-bit character sequence inside a comment. However, DSim treats the input as a sequence of 8-bit characters, one character per byte. It has no knowledge of UTF-8, UTF-16, byte order marks (BOM), etc. Therefore, only encodings that cannot spuriously produce a comment termination are reliable. UTF-8 has this property.

DSim accepts only printable 7-bit ASCII characters in escaped identifiers.

Was this article helpful?

That’s Great!

Thank you for your feedback

Sorry! We couldn't be helpful

Thank you for your feedback

Let us know how can we improve this article!

Select at least one of the reasons
CAPTCHA verification is required.

Feedback sent

We appreciate your effort and will try to fix the article