mainly in the defense secteor previously VHDL wad used. it wsa developed after going through some processes from adda and other languages like taht, but for the market people it was difficult for them to use VHDL, becaz of the syntax u have to define almost everything, but it (VHDL) gives a better control. but the question is do u really need that much control? i have working experience in verilog. i will suggest taht u go through verilog, its very easy, then also consider VHDL becaz a hardware programmer should know or have soime idea of these if possible but he/she should also be master in programingof one. and verilog is easy. also u can fine VHDL to verilog converters. this is a simple book u can find more books on elektroda.
if need further help or material then do let me know