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For Spartan3 Kit beginners

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SphinX

SphinX

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spartan3 kit

Salam,

Ok now, you have Spartan3 Kit and you want to build some projects.
I have choosed LED Blink proj. for you :)
This project blinks LED attached to FPGA every 1 seconds using on-board 50Mhz clock..

Lets start

Here is VHDL Code for divide 50Mhz to 1Hz

Code: 
process (Clk50,rst)
begin
	if Rst='1' then
		mhertz_en<='0';
		mhertz_count<=(others=>'0');
	elsif Clk50'event and Clk50='1' then
		mhertz_count<=mhertz_count + 1;
		if mhertz_count="110010" then
			mhertz_en<='1';
			mhertz_count<=(others=>'0');
		else
			mhertz_en<='0';
		end if;
	end if;
end process;


-- Generate 1HZ signal from 1Mhz signal
process (Clk50,rst)
begin
	if Rst='1' then
		 hertz_en<='0';
		 hertz_count<=(others=>'0');
	elsif Clk50'event and Clk50='1' then
		if mhertz_en='1' then
			 hertz_count<=hertz_count + 1;
			if hertz_count="11110100001001000000" then
				 hertz_en<='1';
				 hertz_count<=(others=>'0');
			else
				 hertz_en<='0';
			end if;
		else
			 hertz_en<='0';
		end if;
	end if;
end process;

To blink a led every 1 sec, you have to creat a new process, and inside this process test Hertz_en value, if it's 1 then flip a signal called ClkBit,
Finally assign the IO port to this signal.

Here is the code

Code: 
-- Blink LED every 1 Second :-)
process (Clk50,Rst)
begin
if Rst='1' then
	ClkOut<='0';
elsif Clk50'event and Clk50='1' then
	if hertz_en='1' then
		ClkBit<= not ClkBit;
    	end if;
end if;
ClkOut<=ClkBit;
end process;


FPGA IO connections

Clk50 = T9
Rst = M13
ClkOut = K12

Sphinx
Bye
 

spartan 3 kit

How do you the the 1Mhz signal to your module? Is it externally supplied?
 

spartan3 kit+discussions

andy1 said:
How do you the the 1Mhz signal to your module? Is it externally supplied?
Click to expand...

Salam andy1,

No you don't need any external clocks but on-board 50 Mhz only.

The first code snippet consist of two process and its function to convert 50Mhz to 1Hz using two steps(process)

1-

Code: 
-- Generate 1MHZ signal from 50Mhz signal 
process (Clk50,rst) 
begin 
   if Rst='1' then 
      mhertz_en<='0'; 
      mhertz_count<=(others=>'0'); 
   elsif Clk50'event and Clk50='1' then 
      mhertz_count<=mhertz_count + 1; 
      if mhertz_count="110010" then 
         mhertz_en<='1'; 
         mhertz_count<=(others=>'0'); 
      else 
         mhertz_en<='0'; 
      end if; 
   end if; 
end process;


2-

Code: 
-- Generate 1HZ signal from 1Mhz signal 
process (Clk50,rst) 
begin 
   if Rst='1' then 
       hertz_en<='0'; 
       hertz_count<=(others=>'0'); 
   elsif Clk50'event and Clk50='1' then 
      if mhertz_en='1' then 
          hertz_count<=hertz_count + 1; 
         if hertz_count="11110100001001000000" then 
             hertz_en<='1'; 
             hertz_count<=(others=>'0'); 
         else 
             hertz_en<='0'; 
         end if; 
      else 
          hertz_en<='0'; 
      end if; 
   end if; 
end process;


SphinX
Eng. Amr Ahmed
 

how to divide 50mhz to get 1mhz in vhdl

@SphinX

That was a nice project , i even think i understand it :)

Thank you for giving small understandable examples

The name Clk50 is that referring to the 50Mhz clock or could you have choosen "any name" ??

Edit : Ahh i see ...

You refer to the pin T9 , anr the 50Mhz is comming in there isnt it ??


/Bingo
 

spartan3 blinking led example vhdl

Salam Bingo,

Clk50 is just a name, you can choose any name :)
Yes T9 is the on-board clock 50Mhz input.


SphinX
 

spartan3 kits

Sure you will need the following UCF file
It defines the pins of the Spartan 3 board.
good luck


Ahmed Abdel Hamid
 

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