If you are a student, your library likely has a physical copy or a digital license via services like O'Reilly or IEEE Xplore. Even if they don't own it, they can often get it from another library for you at no cost.
Many sites claiming to offer free PDFs are actually hubs for malware or "browser hijackers." If a site asks you to download a .exe file or install a "reader" to view the PDF, close the tab immediately. vhdl by example blaine readler pdf free
While not the full PDF, Google Books often provides a significant "Look Inside" preview that includes the first few chapters—often enough to get you through the basics of VHDL syntax. If you are a student, your library likely
If you absolutely cannot find a copy and need to start learning today, there are excellent Open Source and Creative Commons alternatives: While not the full PDF, Google Books often
A comprehensive online resource that mirrors many of the "by example" techniques used by Readler.