RTL级与门级

简单地讲，RTL是用硬件描述语言（Verilog 或VHDL）描述你想达到的功能，门级则是用具体的逻辑单元（依赖厂家的库）来实现你的功能，门级最终可以在半导体厂加工成实际的硬件，一句话，RTL和门级是设计实现上的不同阶段，RTL经过逻辑综合后，就得到门级。

RTL: Register Transfer Level,
design logic in RTL is just like writing software program using language like C;
in RTL design, register (flip flop) is defined as a special kind of variable which can hold data;
Also, normal combinational logic can be expressed as logic equation;

I think you need to at least read some entry level books to get some detailed idea of RTL.