Honored Contributor
Honored ContributorHi,
I just want to add three links which explains the attributes: https://books.google.co.uk/books?id=yt3ccaaaqbaj&pg=pa395&lpg=pa395&dq=vhdl+signal+attributes+table&source=bl&ots=mzlvsrj-mg&sig=jmre0dsfgxaawvhyfzczdlfat2m&hl=de&sa=x&ved=0ahukewiv07qxl_tjahvf7w4khajhbdmq6aeipdae#v=onepage&q=vhdl%20signal%20attributes%20table&f=false http://www.csee.umbc.edu/portal/help/vhdl/attribute.html http://users.ece.utexas.edu/~roth/book/ch8_slides.pdf Those should answer the questions related to attributes of signals in VHDL.
