control.v

fpga功能实现有限字长响应FIR

module control(clk1,clk2,i,OE,reset);
parameter state_reset=9;
parameter state_spare=8;
input clk1,clk2;
output[2:0] i;
output OE;
output reset;
reg reset;
reg OE;
reg[2:0] i;
reg[3:0] state,next_state;
always @(posedge clk1)
    state<=state_reset;
always @(posedge clk2)
   state<=next_state;

always @(state)
begin
    case(state)
        state_reset:begin next_state=0;reset=0;OE=0;i=7;end
        0:begin next_state=1;reset=1;OE=0;i=0;end
        1:begin next_state=2;reset=1;OE=0;i=1;end
        2:begin next_state=3;reset=1;OE=0;i=2;end
        3:begin next_state=4;reset=1;OE=0;i=3;end
        4:begin next_state=5;reset=1;OE=0;i=4;end
        5:begin next_state=6;reset=1;OE=0;i=5;end
        6:begin next_state=7;reset=1;OE=0;i=6;end
        7:begin next_state=state_spare;OE=0;i=7;end
        state_spare:begin next_state=state_spare;reset=1;OE=1;i=7;end
        
        default begin next_state=state_spare;reset=1;OE=0;i=7;end
    endcase
end
    
endmodule