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Diffstat (limited to 'doc/ghdl.texi')
| -rw-r--r-- | doc/ghdl.texi | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/doc/ghdl.texi b/doc/ghdl.texi index eed41f1..ea44ebb 100644 --- a/doc/ghdl.texi +++ b/doc/ghdl.texi @@ -1931,7 +1931,8 @@ completely analyzed using either the 87 or the 93 version of the VHDL standard. @node PSL implementation, Source representation, VHDL standards, GHDL implementation of VHDL @comment node-name, next, previous, up @section PSL implementation -GHDL understands embedded PSL annotations in VHDL files, but in separate files. +GHDL understands embedded PSL annotations in VHDL files, but not in +separate files. As PSL annotations are embedded within comments, you must analyze and elaborate your design with option @option{-fpsl} to enable PSL annotations. @@ -1941,8 +1942,8 @@ with the @code{psl} keyword. The keyword must be followed (on the same line) by a PSL keyword such as @code{assert} or @code{default}. To continue a PSL statement on the next line, just start a new comment. -A PSL statement is considered as a concurrent statement, and therefore is -allowed only where processes are. +A PSL statement is considered as a process. So it is not allowed within +a process. All PSL assertions must be clocked (GHDL doesn't support unclocked assertion). Furthermore only one clock per assertion is allowed. |