module 	diff_p	 	

(
 input rstn
,input clk
,input  en
,input  vldi 
,input  signed [15:0] din0
,input  signed [15:0] din1
,input  signed [15:0] din2
,input  signed [15:0] din3
,output  reg vldo 
,output  signed	[15:0] dout_p0
,output  signed	[15:0] dout_p1
,output  signed	[15:0] dout_p2
,output  signed	[15:0] dout_p3
,output  signed	[15:0] dout_p4
,output  signed	[15:0] dout_p5
,output  signed	[15:0] dout_p6
,output  signed	[15:0] dout_p7
,output  signed	[15:0] diff_p0
,output  signed	[15:0] diff_p1
,output  signed	[15:0] diff_p2
,output  signed	[15:0] diff_p3
,output  signed	[15:0] diff_p4
,output  signed	[15:0] diff_p5
,output  signed	[15:0] diff_p6
,output  signed	[15:0] diff_p7

		 	);		

wire  signed  [15:0]  din_p0_r0;
wire  signed  [15:0]  din_p1_r0;
wire  signed  [15:0]  din_p2_r0;
wire  signed  [15:0]  din_p3_r0;
wire  signed  [15:0]  din_p4_r0;
wire  signed  [15:0]  din_p5_r0;
wire  signed  [15:0]  din_p6_r0;
wire  signed  [15:0]  din_p7_r0;
wire  vldo_0;
wire  vldo_1;
wire  vldo_2;
wire  vldo_3;
wire  vldo_r0;
assign  vldo_r0  =  vldo_0 || vldo_1 || vldo_2 || vldo_3; 
sirv_gnrl_dffr #(1) dff_vldo_1(vldo_r0, vldo ,clk,rstn);
s2p_2 inst1_s2p_2 (
        .clk    (clk),
        .rst_n  (rstn),
        .din    (din0),
        .en   (vldi),
        .dout0 (din_p0_r0),
        .dout1 (din_p4_r0)
        ,.vldo( vldo_0)
    );
s2p_2 inst2_s2p_2 (
        .clk    (clk),
        .rst_n  (rstn),
        .din    (din1),
        .en   (vldi),
        .dout0 (din_p1_r0),
        .dout1 (din_p5_r0)
        ,.vldo( vldo_1)
    );
s2p_2 inst3_s2p_2 (
        .clk    (clk),
        .rst_n  (rstn),
        .din    (din2),
        .en   (vldi),
        .dout0 (din_p2_r0),
        .dout1 (din_p6_r0)
        ,.vldo( vldo_2)
    );
s2p_2 inst4_s2p_2 (
        .clk    (clk),
        .rst_n  (rstn),
        .din    (din3),
        .en   (vldi),
        .dout0 (din_p3_r0),
        .dout1 (din_p7_r0)
        ,.vldo( vldo_3)
    );


reg  signed [15:0]		    din_p0_r1;
reg  signed [15:0]		    din_p1_r1;
reg  signed [15:0]		    din_p2_r1;
reg  signed [15:0]		    din_p3_r1;
reg  signed [15:0]		    din_p4_r1;
reg  signed [15:0]		    din_p5_r1;
reg  signed [15:0]		    din_p6_r1;
reg  signed [15:0]		    din_p7_r1;

sirv_gnrl_dfflr #(16) din_p7_1(en,din_p7_r0, din_p7_r1 ,clk,rstn);

assign  dout_p0 = din_p0_r0;
assign  dout_p1 = din_p1_r0;
assign  dout_p2 = din_p2_r0;
assign  dout_p3 = din_p3_r0;
assign  dout_p4 = din_p4_r0;
assign  dout_p5 = din_p5_r0;
assign  dout_p6 = din_p6_r0;
assign  dout_p7 = din_p7_r0;

reg signed [15:0] diff_p0_r1;
reg signed [15:0] diff_p1_r1;
reg signed [15:0] diff_p2_r1;
reg signed [15:0] diff_p3_r1;
reg signed [15:0] diff_p4_r1;
reg signed [15:0] diff_p5_r1;
reg signed [15:0] diff_p6_r1;
reg signed [15:0] diff_p7_r1;

always  @(posedge clk or negedge rstn)begin
if(rstn==1'b0)begin
    diff_p0_r1 <= 0;
    diff_p1_r1 <= 0;
    diff_p2_r1 <= 0;
    diff_p3_r1 <= 0;
    diff_p4_r1 <= 0;
    diff_p5_r1 <= 0;
    diff_p6_r1 <= 0;
    diff_p7_r1 <= 0;

end
else if(en)begin
    diff_p0_r1 <= din_p0_r0 - din_p7_r1;
    diff_p1_r1 <= din_p1_r0 - din_p0_r0;
    diff_p2_r1 <= din_p2_r0 - din_p1_r0;
    diff_p3_r1 <= din_p3_r0 - din_p2_r0;
    diff_p4_r1 <= din_p4_r0 - din_p3_r0;
    diff_p5_r1 <= din_p5_r0 - din_p4_r0;
    diff_p6_r1 <= din_p6_r0 - din_p5_r0;
    diff_p7_r1 <= din_p7_r0 - din_p6_r0;
end
else begin
    diff_p0_r1 <= diff_p0_r1;
    diff_p1_r1 <= diff_p1_r1;
    diff_p2_r1 <= diff_p2_r1;
    diff_p3_r1 <= diff_p3_r1;
    diff_p4_r1 <= diff_p4_r1;
    diff_p5_r1 <= diff_p5_r1;
    diff_p6_r1 <= diff_p6_r1;
    diff_p7_r1 <= diff_p7_r1;
end
end

assign diff_p0 = diff_p0_r1;
assign diff_p1 = diff_p1_r1;
assign diff_p2 = diff_p2_r1;
assign diff_p3 = diff_p3_r1;
assign diff_p4 = diff_p4_r1;
assign diff_p5 = diff_p5_r1;
assign diff_p6 = diff_p6_r1;
assign diff_p7 = diff_p7_r1;

endmodule