Carl wrote:
> Is it possible to create Timer with alarm function in VHDL?
Yes.

> How to start create it?
Somehow like this:

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library IEEE;

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use IEEE.STD_LOGIC_1164.ALL;

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use IEEE.NUMERIC_STD.ALL;

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entity stopwatch is

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    Port ( clock    : in  STD_LOGIC;

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           reset    : in  STD_LOGIC;

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           -- add your ports for dsplay, buttons and speaker/beeper

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    :

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    :

> How to start create it?
- Generate a one-second pulse.
- Count the seconds, and the minutes and the hours.
- Display those counter vaules on some kind of display.
- Compare the counters with an alarm time and generate a sound on a 
speaker.

> How to start create it?
Maybe you can get a basic idea from there:
http://www.lothar-miller.de/s9y/archives/88-VHDL-vs.-Verilog-am-Beispiel-einer-Stoppuhr.html
Ty google translator, its German. But the VHDL code is nealy 
self-explaining... ;-)