quickly replace in normal mode

I'm a vim newbie.
for example this code block:
///////////////////////////////////////////////////
wire [3:0] w_buff_length;//0--15
always @(posedge clk or negedge rst_n)
if (!rst_n) begin
for(i=0; i< w_buff_length; i=i+1)s_data_buff[i] <= #1 {BIT_WIDTH{1'd0}};
end
else begin
s_data_buff[0] <= #1 i_data;
for(i=0; i< w_buff_length-1;i=i+1)s_data_buff[i+1] <= #1 s_data_buff[i];
end
/////////////////////////////////////////////////
I want to replace w_buff_length with BUFF_LENGTH. I know hit *, and do :%s//BUFF_LENGTH/g can get it? Is there another way do not into command mode?

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