///*********************************************************************/// Copyright(c) 2006, ZTE./// All rights reserved.////// Project name : ZXMBW-250(WIMAX)/// File name    : beta_cal.v/// Author       : yuanliuqing/// Department   : WiMAX department/// Email        : yuan.liuqing@zte.com.cn////// Module_name  : beta_cal/// Called by    : max_log_map  module///---------------------------------------------------------------------/// Module Hiberarchy:///               |----mod_max4_0///               |----mod_max4_1///               |----mod_max4_2///               |----mod_max4_3/// beta_cal------|----mod_max4_4///               |----mod_max4_5///               |----mod_max4_6///               |----mod_max4_7///---------------------------------------------------------------------////// Release History:///---------------------------------------------------------------------/// Version     |    Date     |       Author Description///---------------------------------------------------------------------/// 1.0-0       | 2006-06-15  | 建立文件/// 1.0-1       | 2007-12-21  | 優(yōu)化，fang.yongzhong///---------------------------------------------------------------------/// Main Function:/// 1、CTC譯碼核beta計(jì)算單元///*********************************************************************`timescale 1ns/100psmodule beta_cal    #(parameter SOFT_INFO_WIDTH  = 6'd6,                       ///軟信息寬度                PRIOR_INFO_WIDTH = 6'd8,                       ///先驗(yàn)信息寬度                BRANCH_MATRIC_WIDTH = 6'd9,                    ///分支度量數(shù)據(jù)寬度                STATE_MATRIC_WIDTH = 6'd12  )                  ///狀態(tài)度量數(shù)據(jù)寬度    (                                                              ///system i/f                                                 input              clk_sys,                                ///系統(tǒng)時(shí)鐘信號(hào)    input              rst_b,                                  ///輸入復(fù)位信號(hào)    ///input i/f                                                  input      [SOFT_INFO_WIDTH*2-1:0]       ys,               ///soft info: system part    input      [SOFT_INFO_WIDTH*2-1:0]       yp,               ///soft info: check part    input      [PRIOR_INFO_WIDTH*3-1:0]      la,               ///prior info    input                                    beta_source_val,    input                                    new_beta_cal,    input                                    clr_beta,         ///clr beta and gamma reg    ///output i/f                                                 output wire [STATE_MATRIC_WIDTH*8-1:0]   beta,             ///后向狀態(tài)度量    output wire [BRANCH_MATRIC_WIDTH*16-1:0] gamma,            ///分支度量    output wire [SOFT_INFO_WIDTH*2-1:0]      ys_beta_out,    output wire [PRIOR_INFO_WIDTH*3-1:0]     la_beta_out,    output wire                              beta_sink_val    );///*********************************************************************///內(nèi)部信號(hào)定義///*********************************************************************reg                                 beta_source_val_d1;reg                                 beta_source_val_d2;reg                                 beta_source_val_d3;reg                                 beta_source_val_d4;reg     [STATE_MATRIC_WIDTH-1:0]    beta7;reg     [STATE_MATRIC_WIDTH-1:0]    beta6;reg     [STATE_MATRIC_WIDTH-1:0]    beta5;reg     [STATE_MATRIC_WIDTH-1:0]    beta4;reg     [STATE_MATRIC_WIDTH-1:0]    beta3;reg     [STATE_MATRIC_WIDTH-1:0]    beta2;reg     [STATE_MATRIC_WIDTH-1:0]    beta1;reg     [STATE_MATRIC_WIDTH-1:0]    beta0;///*************************************************************************///input rename///*************************************************************************reg     [SOFT_INFO_WIDTH-1:0]       ys1,ys0,yp1,yp0;reg     [PRIOR_INFO_WIDTH-1:0]      la3,la2,la1;always @(posedge clk_sys) begin    ys1 <= ys[SOFT_INFO_WIDTH*2-1:SOFT_INFO_WIDTH];    ys0 <= ys[SOFT_INFO_WIDTH-1:0];    yp1 <= yp[SOFT_INFO_WIDTH*2-1:SOFT_INFO_WIDTH];    yp0 <= yp[SOFT_INFO_WIDTH-1:0];    la3 <= la[PRIOR_INFO_WIDTH*3-1:PRIOR_INFO_WIDTH*2];    la2 <= la[PRIOR_INFO_WIDTH*2-1:PRIOR_INFO_WIDTH];    la1 <= la[PRIOR_INFO_WIDTH-1:0];end///*************************************************************************///最高位擴(kuò)展并延時(shí)一節(jié)拍///*************************************************************************reg     [BRANCH_MATRIC_WIDTH-1:0]   la3_d1,la2_d1,la1_d1;always @( posedge clk_sys or negedge rst_b ) begin    if( !rst_b ) begin        {la3_d1,la2_d1,la1_d1} <= 27'd0;    end    else begin        la3_d1 <= {la3[PRIOR_INFO_WIDTH-1],la3};        la2_d1 <= {la2[PRIOR_INFO_WIDTH-1],la2};        la1_d1 <= {la1[PRIOR_INFO_WIDTH-1],la1};    endend///*************************************************************************///求取la1，la2，la3的最大并作最高位拓展///*************************************************************************wire [PRIOR_INFO_WIDTH-1:0]    la_max_a,la_max_b,la_max_c;reg  [BRANCH_MATRIC_WIDTH-1:0] la_max;assign la_max_a = la1 - la2;assign la_max_b = la1 - la3;assign la_max_c = la2 - la3;always @( posedge clk_sys or negedge rst_b ) begin    if( !rst_b )        la_max <= 9'd0;    else if(la1[7]==1'b1 & la2[7]==1'b1 & la3[7]==1'b1)        la_max <= 9'd0;    else        case ({la_max_a[7], la_max_b[7], la_max_c[7]})            3'b000,3'b001 : la_max <= {la1[PRIOR_INFO_WIDTH-1],la1};            3'b100,3'b110 : la_max <= {la2[PRIOR_INFO_WIDTH-1],la2};            default :       la_max <= {la3[PRIOR_INFO_WIDTH-1],la3};        endcaseend///*************************************************************************///分支度量計(jì)算6，8，9///*************************************************************************reg [BRANCH_MATRIC_WIDTH-1:0] gamma15_t1,gamma14_t1,gamma13_t1,gamma12_t1,                              gamma11_t1,gamma10_t1,gamma9_t1, gamma8_t1,                              gamma7_t1, gamma6_t1, gamma5_t1, gamma4_t1,                              gamma3_t1, gamma2_t1, gamma1_t1, gamma0_t1;always @( posedge clk_sys or negedge rst_b ) begin    if( !rst_b ) begin        gamma0_t1  <= 9'd0;        gamma1_t1  <= 9'd0;        gamma2_t1  <= 9'd0;        gamma3_t1  <= 9'd0;        gamma4_t1  <= 9'd0;        gamma5_t1  <= 9'd0;        gamma6_t1  <= 9'd0;        gamma7_t1  <= 9'd0;        gamma8_t1  <= 9'd0;        gamma9_t1  <= 9'd0;        gamma10_t1 <= 9'd0;        gamma11_t1 <= 9'd0;        gamma12_t1 <= 9'd0;        gamma13_t1 <= 9'd0;        gamma14_t1 <= 9'd0;        gamma15_t1 <= 9'd0;    end    else begin        gamma0_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma1_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma2_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma3_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma4_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma5_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma6_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma7_t1  <= + {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma8_t1  <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma9_t1  <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma10_t1 <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma11_t1 <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} + {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma12_t1 <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma13_t1 <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      + {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma14_t1 <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} + {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};        gamma15_t1 <= - {{3{ys0[SOFT_INFO_WIDTH-1]}},ys0} - {{3{ys1[SOFT_INFO_WIDTH-1]}},ys1}                      - {{3{yp0[SOFT_INFO_WIDTH-1]}},yp0} - {{3{yp1[SOFT_INFO_WIDTH-1]}},yp1};    endendwire    [BRANCH_MATRIC_WIDTH-1:0]   gamma15_t2,gamma14_t2,gamma13_t2,gamma12_t2,                                    gamma11_t2,gamma10_t2,gamma9_t2, gamma8_t2,                                    gamma7_t2, gamma6_t2, gamma5_t2, gamma4_t2,                                    gamma3_t2, gamma2_t2, gamma1_t2, gamma0_t2;///0-3assign  gamma0_t2  = gamma0_t1 - la_max;assign  gamma1_t2  = gamma1_t1 - la_max;assign  gamma2_t2  = gamma2_t1 - la_max;assign  gamma3_t2  = gamma3_t1 - la_max;///4-7assign  gamma4_t2  = gamma4_t1  + la1_d1 - la_max;assign  gamma5_t2  = gamma5_t1  + la1_d1 - la_max;assign  gamma6_t2  = gamma6_t1  + la1_d1 - la_max;assign  gamma7_t2  = gamma7_t1  + la1_d1 - la_max;///8-11assign  gamma8_t2  = gamma8_t1  + la2_d1 - la_max;assign  gamma9_t2  = gamma9_t1  + la2_d1 - la_max;assign  gamma10_t2 = gamma10_t1 + la2_d1 - la_max;assign  gamma11_t2 = gamma11_t1 + la2_d1 - la_max;///12-15assign  gamma12_t2 = gamma12_t1 + la3_d1 - la_max;assign  gamma13_t2 = gamma13_t1 + la3_d1 - la_max;assign  gamma14_t2 = gamma14_t1 + la3_d1 - la_max;assign  gamma15_t2 = gamma15_t1 + la3_d1 - la_max;///gamma regreg [BRANCH_MATRIC_WIDTH-1:0] gamma15,gamma14,gamma13,gamma12,                              gamma11,gamma10,gamma9, gamma8,                              gamma7, gamma6, gamma5, gamma4,                              gamma3, gamma2, gamma1, gamma0;always @ ( posedge clk_sys or negedge rst_b ) begin    if( !rst_b ) begin        { gamma15, gamma14, gamma13, gamma12,            gamma11, gamma10, gamma9, gamma8,                gamma7, gamma6, gamma5, gamma4,                    gamma3, gamma2, gamma1, gamma0 }                        <= 1'b0;    end