FPGA Prototyping by VHDL Examples: Xilinx Spartan-3 Version

FPGA Prototyping by VHDL Examples: Xilinx MicroBlaze MCS SoC

Design Recipes for FPGAs: Using Verilog and VHDL

Digital Design Using Digilent FPGA Boards: VHDL / Vivado Edition

Digital System Design with FPGA: Implementation Using Verilog and VHDL (ELECTRONICS)