instantiate an edf module with ise

hi,

can anybody here tell me how to instantiate an edn module with ise 6? i tried so, but it didnot work:

.........

component uart_tx is port ( din : in STD_LOGIC_VECTOR (7 downto 0); write : in STD_LOGIC; reset_buffer : in STD_LOGIC; en_16_x_baud : in STD_LOGIC; clk : in STD_LOGIC; serial_out : out STD_LOGIC; buffer_full : out STD_LOGIC); end component;

begin

inst_uart_tx : uart_tx port map( din => din; write => write; reset_buffer => reset_buffer; en_16_x_baud => en_16_x_baud; clk => clk; serial_out => serial_out; buffer_full => buffer_full);

.........

uart_tx is the name of the edn module. it is in the same directory as the project's.

thanks.

with greeting