have a look at reference designs on the altera and xilinx websites.
And for interfaces take a look at opencores.org, theres a ton of
interface (PCI, USB) and micro-processor
designs available, many of which are written in VHDL

"CMOS" <manusha@millenniumit.com> wrote in message 
news:1139068845.604136.314600@g14g2000cwa.googlegroups.com...
> hi,
> i've completed a introdutory vhdl book and done several small scale
> designs using vhdl for FPGA implementations. However the book i read
> does not cover any advanced topics or designs that we meet in real
> life, like micro-controllers, USB interfaces, etc. i' ve serched the
> net for books and tutorials which will discuss advanced topics and
> having a moderately complex case study at the end, but found non for
> vhdl. If  anyone knows any such books, tutorials or other resources,
> please let me know.

http://www.ashenden.com.au/designers-guide/DG-intro-lectures.html

or, even better, buy his book.

http://www.amazon.com/gp/product/1558606742/sr=1-2/qid=1139103691/ref=sr_1_2/103-7172689-9857457?%5Fencoding=UTF8 

hi,
i've completed a introdutory vhdl book and done several small scale
designs using vhdl for FPGA implementations. However the book i read
does not cover any advanced topics or designs that we meet in real
life, like micro-controllers, USB interfaces, etc. i' ve serched the
net for books and tutorials which will discuss advanced topics and
having a moderately complex case study at the end, but found non for
vhdl. If  anyone knows any such books, tutorials or other resources,
please let me know.

CMOS