Hello, This source is a capture the ADC0804 with FPGA Spartan3,
Oscillator 50MHz
frequency Clk for ADC is 650KHz,  sampling frequency 8Hz, show the
data capture in array leds.

//##############adc08.v###################
//#########Develp by Jhoberg Quevedo############
//#########email: jrquevedor@gmail.com###########

module adc08(clkadc,adc,adccs,adcwr,adcintr,led,osc);
parameter Nosc=32;
input osc;
input adcintr;
input [7:0] adc;
output clkadc;
output adccs;
output adcwr;
output [7:0] led;

reg clkadc;
reg adccs;
reg adcwr;

reg [7:0] dato;
reg [7:0] led;
reg [Nosc:0] tcont;
reg [7:0] tclk;

always @(posedge osc)
begin
tcont=tcont+1;
tclk=tclk+1;
if(tcont==6250000)
  begin
  	tcont=0;
   	if (adccs)
	    begin
			adccs=0;
			adcwr=0;

		 end
		else
		 begin
			adccs=1;
			adcwr=1;
		 end
  end
if (tclk==77)
 begin
  tclk=0;
   if (clkadc)
	    clkadc=0;
	else
      clkadc=1;
 end

end

always @(posedge  adcintr)
begin
  led=adc;
end

endmodule

#####################adc08.v#####################