Generating a pulse train at specific time on FPGA using VHDL programming.

Okay, First you need to know that you are working with hardware which executes parallel. So basically everything runs at the same time. If you need a delay, you build a timer and do something depending on this timer. You could start by making something basic. One of the first things I did was building a "knight rider" effect. It is a shift register that is connected to some leds. Each led is turned on and of in time, and when the last one is lit the effect is reversed. This uses some basic elements like a shift register, a counter and a little more sophisticated element: a prescaler.