What dose it mean by User Constraints File?
I wrote the following program for seven segment display driver using
Xilinx CoolRunner starter kit-
LIBRARY ieee;
USE ieee.std_logic_1164.all;
ENTITY seg7 IS
PORT (D : IN STD_LOGIC_VECTOR (3 DOWNTO 0);
S : OUT STD_LOGIC_VECTOR (6 DOWNTO 0));
END seg7;
ARCHITECTURE display OF SEG7 IS
BEGIN
s <= "1000000" WHEN d = "0000" ELSE -- H"40"
"1111001" WHEN d = "0001" ELSE -- H"79"
"0100100" WHEN d = "0010" ELSE -- H"24"
"0110000" WHEN d = "0011" ELSE -- H"30"
"0011001" WHEN d = "0100" ELSE -- H"19"
"0010010" WHEN d = "0101" ELSE -- H"12"
"0000010" WHEN d = "0110" ELSE -- H"02"
"1111000" WHEN d = "0111" ELSE -- H"78"
"0000000" WHEN d = "1000" ELSE -- H"00"
"0010000" WHEN d = "1001" ELSE -- H"10"
"0001000" WHEN d = "1010" ELSE -- H"08"
"0000011" WHEN d = "1011" ELSE -- H"03"
"1000110" WHEN d = "1100" ELSE -- H"46"
"0100001" WHEN d = "1101" ELSE -- H"21"
"0000110" WHEN d = "1110" ELSE -- H"06"
"0001110"; -- H"0E"
END display;
But what will be the User Constraints File for it?
In the User Constraints File you e.g. assign pins to your top entity port and in this file you specify a desired clock rate. BTW:
1 | s <= "1000000" WHEN d = "0000" ELSE -- H"40" |
2 | "1111001" WHEN d = "0001" ELSE -- H"79" |
3 | "0100100" WHEN d = "0010" ELSE -- H"24" |
4 | :
|
this you could write a little more readable:
1 | s <= x"40" WHEN d = x"0" ELSE |
2 | x"79" WHEN d = x"1" ELSE |
3 | x"24" WHEN d = x"2" ELSE |
4 | :
|
5 | x"06" WHEN d = x"E" ELSE |
6 | x"0E"
|
Thanks... But the problem is that after implementing this code it created a .JED file for the CoolRunner II but nothing was happening.Then I realized that I have to make an .UCF file for that project.But I really don't know how to make one for my program.So can u plz advice what shall I do??
> But I really don't know how to make one for my program. > So can u plz advice what shall I do?? Go to the Processes and click on Assign Package Pins. Then you will be asked to add a ucf file to your design. And after starting the Wizzard (PACE) you can assign the pins simply by Drag&Drop.
Thnx... I would like to know how can I give an audible output?Like if sum1 has pressed the push button on the Xilinx CPLD starter kit,so there shud b an audible output... If possible I need ur suggestion?And thank u again...
> If possible I need ur suggestion?And thank u again...
What kind of speaker do you have?
Usually thats the way:
Generate a audible frequency with a counter. Connect it to the speaker
pins. When the button is not pressed reset the counter, so theres
nothing to hear...1 | :
|
2 | use ieee.numeric_std.all |
3 | :
|
4 | port ( clk : in std_logic; |
5 | btn : in std_logic; |
6 | spkr : out std_logic); |
7 | :
|
8 | signal counter : integer range 0 to 10_000_000/1600 := 0; -- clk-frequency = 10Mhz, speaker output = 800Hz |
9 | signal intspkr : std_logic := '0'; |
10 | :
|
11 | process begin |
12 | wait until rising_edge(clk); |
13 | if (counter<10_000_000/1600) then -- reached end of counter? |
14 | counter <= counter+1; -- no: increment |
15 | else
|
16 | counter <= 0; -- yes: reset counter |
17 | intspkr <= not intspkr; -- toggle output |
18 | end if; |
19 | if (btn='0') then -- button not pressed: |
20 | counter <= 0; -- reset counter |
21 | end if; |
22 | end process; |
23 | spkr <= intspkr; |
24 | :
|
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