To learn verilog, can anyone recommend any web-page or book?
I have never seen such type of a language before, so what you recommend should be for beginner.
I've recently embarked on a simmilar journey my self and so far I've found the following useful:
This youtube video blog by Tbird761 (http://www.youtube.com/watch?v=gsTpLtEEobE
and this book by Pong P. Chu (FPGA Prototyping By Verilog Examples: Xilinx Spartan-3 Version [Hardcover])
When I was learning Verilog I mainly used two resources, the Southerland Online Reference Guide and the FPGA4Fun website. Verilog (for me) required a massive brain shift, so take it slowly. You can do a lot of stuff in simulation, but sometimes it's difficult to create the test waveforms you need. Actually having an FPGA to program helps a lot. You should be able to get a simple board for ~$100. FPGA4Fun sells some useful boards.
Probably the most important thing to understand about Verilog is that the tools you use to convert verilog (or vhdl) to gates have certain idioms that they use to map verilog to certain types of gates - you need to write using these to get what you want
As a (most simplest) rule:
will give you a flop while
will give you a combinatorial (a logic net).
Understanding the differences between '=' and '<=' is important, but more important is simply making sure you use <= for all flops and = elsewhere.