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/****************************************************************************************
*
* File Name: ddr3_dimm.v
*
* Description: Micron SDRAM DDR3 (Double Data Rate 3) 240 pin dual in-line memory module (DIMM)
*
* Limitation: - SPD (Serial Presence-Detect) is not modeled
*
* Disclaimer This software code and all associated documentation, comments or other
* of Warranty: information (collectively "Software") is provided "AS IS" without
* warranty of any kind. MICRON TECHNOLOGY, INC. ("MTI") EXPRESSLY
* DISCLAIMS ALL WARRANTIES EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO, NONINFRINGEMENT OF THIRD PARTY RIGHTS, AND ANY IMPLIED WARRANTIES
* OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. MTI DOES NOT
* WARRANT THAT THE SOFTWARE WILL MEET YOUR REQUIREMENTS, OR THAT THE
* OPERATION OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR-FREE.
* FURTHERMORE, MTI DOES NOT MAKE ANY REPRESENTATIONS REGARDING THE USE OR
* THE RESULTS OF THE USE OF THE SOFTWARE IN TERMS OF ITS CORRECTNESS,
* ACCURACY, RELIABILITY, OR OTHERWISE. THE ENTIRE RISK ARISING OUT OF USE
* OR PERFORMANCE OF THE SOFTWARE REMAINS WITH YOU. IN NO EVENT SHALL MTI,
* ITS AFFILIATED COMPANIES OR THEIR SUPPLIERS BE LIABLE FOR ANY DIRECT,
* INDIRECT, CONSEQUENTIAL, INCIDENTAL, OR SPECIAL DAMAGES (INCLUDING,
* WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION,
* OR LOSS OF INFORMATION) ARISING OUT OF YOUR USE OF OR INABILITY TO USE
* THE SOFTWARE, EVEN IF MTI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGES. Because some jurisdictions prohibit the exclusion or
* limitation of liability for consequential or incidental damages, the
* above limitation may not apply to you.
*
* Copyright 2003 Micron Technology, Inc. All rights reserved.
*
****************************************************************************************/
`timescale 1ps / 1ps
`define den8192Mb
`define sg125
`define x8
module ddr3_dimm (
reset_n,
ck ,
ck_n ,
cke ,
s_n ,
ras_n ,
cas_n ,
we_n ,
ba ,
addr ,
odt ,
dqs ,
dqs_n ,
dq ,
cb ,
scl ,
sa ,
sda
);
`ifdef den1024Mb
`include "1024Mb_ddr3_parameters.vh"
`elsif den2048Mb
`include "2048Mb_ddr3_parameters.vh"
`elsif den4096Mb
`include "4096Mb_ddr3_parameters.vh"
`elsif den8192Mb
`include "8192Mb_ddr3_parameters.vh"
`else
// NOTE: Intentionally cause a compile fail here to force the users
// to select the correct component density before continuing
ERROR: You must specify component density with +define+den____Mb.
`endif
input reset_n;
input [1:0] ck ;
input [1:0] ck_n ;
input [1:0] cke ;
input [1:0] s_n ;
input ras_n ;
input cas_n ;
input we_n ;
input [2:0] ba ;
input [15:0] addr ;
input [1:0] odt ;
inout [17:0] dqs ;
inout [17:0] dqs_n ;
inout [63:0] dq ;
inout [7:0] cb ;
input scl ; // no connect
input [2:0] sa ; // no connect
inout sda ; // no connect
`ifdef DUAL_RANK
initial if (DEBUG) $display("%m: Dual Rank");
`else
initial if (DEBUG) $display("%m: Single Rank");
`endif
`ifdef ECC
initial if (DEBUG) $display("%m: ECC");
`else
initial if (DEBUG) $display("%m: non ECC");
`endif
`ifdef RDIMM
initial if (DEBUG) $display("%m: Registered DIMM");
wire [1:0] rck = {2{ck[0]}};
wire [1:0] rck_n = {2{ck_n[0]}};
reg [1:0] rcke ;
reg [1:0] rs_n ;
reg rras_n ;
reg rcas_n ;
reg rwe_n ;
reg [2:0] rba ;
reg [15:0] raddr ;
reg [1:0] rodt ;
always @(negedge reset_n or posedge ck[0]) begin
if (!reset_n) begin
rcke <= #(500) 0;
rs_n <= #(500) 0;
rras_n <= #(500) 0;
rcas_n <= #(500) 0;
rwe_n <= #(500) 0;
rba <= #(500) 0;
raddr <= #(500) 0;
rodt <= #(500) 0;
end else begin
rcke <= #(500) cke ;
rs_n <= #(500) s_n ;
rras_n <= #(500) ras_n;
rcas_n <= #(500) cas_n;
rwe_n <= #(500) we_n ;
rba <= #(500) ba ;
raddr <= #(500) addr ;
rodt <= #(500) odt ;
end
end
`else
initial if (DEBUG) $display("%m: Unbuffered DIMM");
wire [1:0] rck = ck ;
wire [1:0] rck_n = ck_n ;
wire [1:0] rs_n = s_n ;
wire [2:0] rba = ba ;
wire [15:0] raddr = addr ;
wire [1:0] rcke = cke ;
wire rras_n = ras_n;
wire rcas_n = cas_n;
wire rwe_n = we_n ;
wire [1:0] rodt = odt ;
`endif
wire zero = 1'b0;
wire one = 1'b1;
//ddr3 (rst_n , ck , ck_n , cke , cs_n , ras_n , cas_n , we_n , dm_tdqs , ba , addr , dq , dqs , dqs_n , tdqs_n , odt );
`ifdef x4
initial if (DEBUG) $display("%m: Component Width = x4");
ddr3 U1 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[ 3: 0], dqs[ 0], dqs_n[ 0], , rodt[0]);
ddr3 U2 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[11: 8], dqs[ 1], dqs_n[ 1], , rodt[0]);
ddr3 U3 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[19:16], dqs[ 2], dqs_n[ 2], , rodt[0]);
ddr3 U4 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[27:24], dqs[ 3], dqs_n[ 3], , rodt[0]);
ddr3 U6 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[35:32], dqs[ 4], dqs_n[ 4], , rodt[0]);
ddr3 U7 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[43:40], dqs[ 5], dqs_n[ 5], , rodt[0]);
ddr3 U8 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[51:48], dqs[ 6], dqs_n[ 6], , rodt[0]);
ddr3 U9 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[59:56], dqs[ 7], dqs_n[ 7], , rodt[0]);
`ifdef ECC
ddr3 U5 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], cb[ 3: 0], dqs[ 8], dqs_n[ 8], , rodt[0]);
`endif
ddr3 U18 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[ 7: 4], dqs[ 9], dqs_n[ 9], , rodt[0]);
ddr3 U17 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[15:12], dqs[ 10], dqs_n[ 10], , rodt[0]);
ddr3 U16 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[23:20], dqs[ 11], dqs_n[ 11], , rodt[0]);
ddr3 U15 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[31:28], dqs[ 12], dqs_n[ 12], , rodt[0]);
ddr3 U13 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[39:36], dqs[ 13], dqs_n[ 13], , rodt[0]);
ddr3 U12 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[47:44], dqs[ 14], dqs_n[ 14], , rodt[0]);
ddr3 U11 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[55:52], dqs[ 15], dqs_n[ 15], , rodt[0]);
ddr3 U10 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[63:60], dqs[ 16], dqs_n[ 16], , rodt[0]);
`ifdef ECC
ddr3 U14 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], cb[ 7: 4], dqs[ 17], dqs_n[ 17], , rodt[0]);
`endif
`ifdef DUAL_RANK
ddr3 U1t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[ 3: 0], dqs[ 0], dqs_n[ 0], , rodt[1]);
ddr3 U2t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[11: 8], dqs[ 1], dqs_n[ 1], , rodt[1]);
ddr3 U3t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[19:16], dqs[ 2], dqs_n[ 2], , rodt[1]);
ddr3 U4t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[27:24], dqs[ 3], dqs_n[ 3], , rodt[1]);
ddr3 U6t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[35:32], dqs[ 4], dqs_n[ 4], , rodt[1]);
ddr3 U7t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[43:40], dqs[ 5], dqs_n[ 5], , rodt[1]);
ddr3 U8t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[51:48], dqs[ 6], dqs_n[ 6], , rodt[1]);
ddr3 U9t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[59:56], dqs[ 7], dqs_n[ 7], , rodt[1]);
`ifdef ECC
ddr3 U5t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], cb[ 3: 0], dqs[ 8], dqs_n[ 8], , rodt[1]);
`endif
ddr3 U18t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[ 7: 4], dqs[ 9], dqs_n[ 9], , rodt[1]);
ddr3 U17t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[15:12], dqs[ 10], dqs_n[ 10], , rodt[1]);
ddr3 U16t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[23:20], dqs[ 11], dqs_n[ 11], , rodt[1]);
ddr3 U15t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[31:28], dqs[ 12], dqs_n[ 12], , rodt[1]);
ddr3 U13t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[39:36], dqs[ 13], dqs_n[ 13], , rodt[1]);
ddr3 U12t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[47:44], dqs[ 14], dqs_n[ 14], , rodt[1]);
ddr3 U11t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[55:52], dqs[ 15], dqs_n[ 15], , rodt[1]);
ddr3 U10t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], dq[63:60], dqs[ 16], dqs_n[ 16], , rodt[1]);
`ifdef ECC
ddr3 U14t (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, zero , rba, raddr[ADDR_BITS-1:0], cb[ 7: 4], dqs[ 17], dqs_n[ 17], , rodt[1]);
`endif
`endif
`else `ifdef x8
initial if (DEBUG) $display("%m: Component Width = x8");
ddr3 U1 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[ 9] , rba, raddr[ADDR_BITS-1:0], dq[ 7: 0], dqs[ 0], dqs_n[ 0], dqs_n[ 9], rodt[0]);
ddr3 U2 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[10] , rba, raddr[ADDR_BITS-1:0], dq[15: 8], dqs[ 1], dqs_n[ 1], dqs_n[10], rodt[0]);
ddr3 U3 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[11] , rba, raddr[ADDR_BITS-1:0], dq[23:16], dqs[ 2], dqs_n[ 2], dqs_n[11], rodt[0]);
ddr3 U4 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[12] , rba, raddr[ADDR_BITS-1:0], dq[31:24], dqs[ 3], dqs_n[ 3], dqs_n[12], rodt[0]);
ddr3 U6 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[13] , rba, raddr[ADDR_BITS-1:0], dq[39:32], dqs[ 4], dqs_n[ 4], dqs_n[13], rodt[0]);
ddr3 U7 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[14] , rba, raddr[ADDR_BITS-1:0], dq[47:40], dqs[ 5], dqs_n[ 5], dqs_n[14], rodt[0]);
ddr3 U8 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[15] , rba, raddr[ADDR_BITS-1:0], dq[55:48], dqs[ 6], dqs_n[ 6], dqs_n[15], rodt[0]);
ddr3 U9 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[16] , rba, raddr[ADDR_BITS-1:0], dq[63:56], dqs[ 7], dqs_n[ 7], dqs_n[16], rodt[0]);
`ifdef ECC
ddr3 U5 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[17] , rba, raddr[ADDR_BITS-1:0], cb[ 7: 0], dqs[ 8], dqs_n[ 8], dqs_n[17], rodt[0]);
`endif
`ifdef DUAL_RANK
ddr3 U18 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[ 9] , rba, raddr[ADDR_BITS-1:0], dq[ 7: 0], dqs[ 0], dqs_n[ 0], dqs_n[ 9], rodt[1]);
ddr3 U17 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[10] , rba, raddr[ADDR_BITS-1:0], dq[15: 8], dqs[ 1], dqs_n[ 1], dqs_n[10], rodt[1]);
ddr3 U16 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[11] , rba, raddr[ADDR_BITS-1:0], dq[23:16], dqs[ 2], dqs_n[ 2], dqs_n[11], rodt[1]);
ddr3 U15 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[12] , rba, raddr[ADDR_BITS-1:0], dq[31:24], dqs[ 3], dqs_n[ 3], dqs_n[12], rodt[1]);
ddr3 U13 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[13] , rba, raddr[ADDR_BITS-1:0], dq[39:32], dqs[ 4], dqs_n[ 4], dqs_n[13], rodt[1]);
ddr3 U12 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[14] , rba, raddr[ADDR_BITS-1:0], dq[47:40], dqs[ 5], dqs_n[ 5], dqs_n[14], rodt[1]);
ddr3 U11 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[15] , rba, raddr[ADDR_BITS-1:0], dq[55:48], dqs[ 6], dqs_n[ 6], dqs_n[15], rodt[1]);
ddr3 U10 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[16] , rba, raddr[ADDR_BITS-1:0], dq[63:56], dqs[ 7], dqs_n[ 7], dqs_n[16], rodt[1]);
`ifdef ECC
ddr3 U14 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[17] , rba, raddr[ADDR_BITS-1:0], cb[ 7: 0], dqs[ 8], dqs_n[ 8], dqs_n[17], rodt[1]);
`endif
`endif
`else `ifdef x16
initial if (DEBUG) $display("%m: Component Width = x16");
ddr3 U1 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[10: 9], rba, raddr[ADDR_BITS-1:0], dq[15: 0], dqs[1:0], dqs_n[1:0], , rodt[0]);
ddr3 U2 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[12:11], rba, raddr[ADDR_BITS-1:0], dq[31:16], dqs[3:2], dqs_n[3:2], , rodt[0]);
ddr3 U4 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[14:13], rba, raddr[ADDR_BITS-1:0], dq[47:32], dqs[5:4], dqs_n[5:4], , rodt[0]);
ddr3 U5 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, dqs[16:15], rba, raddr[ADDR_BITS-1:0], dq[63:48], dqs[7:6], dqs_n[7:6], , rodt[0]);
`ifdef ECC
ddr3 U3 (reset_n, rck[0], rck_n[0], rcke[0], rs_n[0], rras_n, rcas_n, rwe_n, {one, dqs[17]}, rba, raddr[ADDR_BITS-1:0], {{8{zero}}, cb}, {zero, dqs[8]}, {one, dqs_n[8]},, rodt[0]);
`endif
`ifdef DUAL_RANK
ddr3 U10 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[10: 9], rba, raddr[ADDR_BITS-1:0], dq[15: 0], dqs[1:0], dqs_n[1:0], , rodt[1]);
ddr3 U9 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[12:11], rba, raddr[ADDR_BITS-1:0], dq[31:16], dqs[3:2], dqs_n[3:2], , rodt[1]);
ddr3 U7 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[14:13], rba, raddr[ADDR_BITS-1:0], dq[47:32], dqs[5:4], dqs_n[5:4], , rodt[1]);
ddr3 U6 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, dqs[16:15], rba, raddr[ADDR_BITS-1:0], dq[63:48], dqs[7:6], dqs_n[7:6], , rodt[1]);
`ifdef ECC
ddr3 U8 (reset_n, rck[1], rck_n[1], rcke[1], rs_n[1], rras_n, rcas_n, rwe_n, {one, dqs[17]}, rba, raddr[ADDR_BITS-1:0], {{8{zero}}, cb}, {zero, dqs[8]}, {one, dqs_n[8]},, rodt[1]);
`endif
`endif
`endif `endif `endif
endmodule