Digital Design

This is a great book for 1st year engineering students or engineers from other disciplines who need a basic, thorough introduction to digital logic. No previous knowledge is required. The book is systematic, well organized, and thorough. It covers gate level combinational and sequential logic, state machines, hardware fifos, and k-maps. There are numerous good examples that make the concepts very clear. If you read this book you will walk away with a good working knowledge of gate-level logic circuits. As with any engineering book, the best way to really learn is by working out examples. So I'd also recommend you get some basic FPGA software (ISE or Quartus) and an FPGA development board to practice with.

The hard cover book (Digital Design) is excellent for students and instructors. The other one (VHDL for Digital Design) is a good book for starters in HDL language.