Help with CIC decimation filter

There are few other changes I made here:

always @(negedge clk)

begin : FSM // finite state machine

case (state)

hold : begin

if (count<63) // setting states for downsampling

state <= hold;

else

state <=sample;

end

default:

state <= hold;

endcase

end

assign sx={{16{x[7]}},x_in};

// Integrator

always @(posedge clk or reset)begin

if(reset) begin

count = 6'd0;

x = 8'd0;

i0 = 24'd0;

i1 = 19'd0;

i2 = 14'd0;

end

begin: I

x <= x_in;

i0 <= i0 + {{16{x[7]}},x_in}; //sx;

i1 <= i1+i0[23:7];

i2 <= i2+i1[18:5];

case (state) //downsample

sample : begin

c0 <= i2[13:1];

count <= 0; //reset counter once a sample has been fetched

end

default :

count <= count+1;

endcase

end

end

// COMB

always @(posedge clk)

begin: COMB

i2d1 <= c0;

c1 <= c0-i2d1;

c1d1 <= c1[11:1];

c2 <= c1[11:1]-c1d1;

c2d1 <= c2[10:1];

c3 <= c2[10:1]-c2d1;

end

assign y_out=c3[9:2];

endmodule