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digital_frequency_meter [2021/01/26 10:32]
anran 		digital_frequency_meter [2021/01/26 11:26] (当前版本)
anran
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 本设计基于 step-max0-08sam核心板 和 training功能板 平台，测量模拟信号调理后的脉冲信号 fxa 的频率、周期、占空比、以及 fxa 和 fxb 信号的相位差。整体RTL图如下所示 本设计基于 step-max0-08sam核心板 和 training功能板 平台，测量模拟信号调理后的脉冲信号 fxa 的频率、周期、占空比、以及 fxa 和 fxb 信号的相位差。整体RTL图如下所示
  
-{{:​20210121.png?​1000|RTL框图}}+{{:​20210121.png?​1500|RTL框图}}
  
 设计只包含数字部分，系统主要由4个模块组成： 设计只包含数字部分，系统主要由4个模块组成：
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   - 周期测频法：是在被测信号的一个周期时间Tx内，对标准信号Ts 脉冲进行计数，计数结果Ns,​Ns 量化误差| dNs | <=1。 因此有Tx =NsT s 即:Fx = Fs / Ns，其中 Fx 与 Fs 分别对应被测信号和标准信号的频率。在实际计算测量中一般不考虑标准信号 Fs 的误差。Ns 越大相对误差越小，也就是说对同一被测信号选择频率越高的标准信号相对误差越小   - 周期测频法：是在被测信号的一个周期时间Tx内，对标准信号Ts 脉冲进行计数，计数结果Ns,​Ns 量化误差| dNs | <=1。 因此有Tx =NsT s 即:Fx = Fs / Ns，其中 Fx 与 Fs 分别对应被测信号和标准信号的频率。在实际计算测量中一般不考虑标准信号 Fs 的误差。Ns 越大相对误差越小，也就是说对同一被测信号选择频率越高的标准信号相对误差越小
   - 等精度测频法：闸门时间不是固定的值，而是被测信号周期的整数倍，即与被测信号同步，误差仅存在于时钟计数的±1误差，对于输入信号计数不存在误差。前两种方案在其测量范围内可以达到精度要求，但等精度测频法与前两种的不同之处在于其在测量范围内的精度是固定的，精度足够，而且可以满足测量范围，不用切换。闸门时间内，对 被测信号 和 标准信号 同时计数，标准信号频率为 Fs，计数为 Ns，被测信号计数 Nx，频率为 Fx，所以 ​  Ns / Fs =  Nx  / Fx，因此 Fx = Fs * Nx / Ns。   - 等精度测频法：闸门时间不是固定的值，而是被测信号周期的整数倍，即与被测信号同步，误差仅存在于时钟计数的±1误差，对于输入信号计数不存在误差。前两种方案在其测量范围内可以达到精度要求，但等精度测频法与前两种的不同之处在于其在测量范围内的精度是固定的，精度足够，而且可以满足测量范围，不用切换。闸门时间内，对 被测信号 和 标准信号 同时计数，标准信号频率为 Fs，计数为 Ns，被测信号计数 Nx，频率为 Fx，所以 ​  Ns / Fs =  Nx  / Fx，因此 Fx = Fs * Nx / Ns。
 +
 +{{:​等精度测量原理.jpg?​1000|等精度测量原理}}
  
 通过对比，最终选择等精度测频法。 通过对比，最终选择等精度测频法。
行 552: 行 554:
 </​code>​ </​code>​
  
 +---
 +例化多个BCD转码模块，实现多个数据的BCD转码功能，Verilog代码
 +<code verilog>
 + //​==========================================================================
 +//
 +// Author: STEP
 +// Module: bin2bcd_top
 +// Description: ​
 +// Web: www.stepfapga.com
 +//​--------------------------------------------------------------------------
 +// Info:
 +//   ​V1.0---yyyy/​mm/​dd---Initial version
 +//
 +//​==========================================================================
  
 +//timescale
 +`timescale 1ns / 1ns
  
 +module bin2bcd_top #(
 +    parameter BIN_WIDTH = 32,
 +    parameter BCD_WIDTH = 40
 +)
 +(
 +    input clk,
 +    input rst_n,
 +
 +    input [BIN_WIDTH-1:​0] Fxcnt_quotient,​
 +    input [BIN_WIDTH-1:​0] FxPeriod_quotient,​
 +    input [BIN_WIDTH-1:​0] DutyCnt_quotient,​
 +    input [BIN_WIDTH-1:​0] DelayDutyCnt_quotient,​
 +
 +    output [BCD_WIDTH-1:​0] Fxcnt_quotient_code,​
 +    output [BCD_WIDTH-1:​0] FxPeriod_quotient_code,​
 +    output [BCD_WIDTH-1:​0] DutyCnt_quotient_code,​
 +    output [BCD_WIDTH-1:​0] DelayDutyCnt_quotient_code
 +);
 +
 +bin2bcd u_bin2bcd_Fxcnt (
 +    .clk                     ( clk                  ),
 +    .rst_n ​                  ( rst_n                ),
 +    .start ​                  ( 1'​b1 ​                ),
 +    .bin_code ​               ( Fxcnt_quotient ​      ),
 +    .bcd_code ​               ( Fxcnt_quotient_code ​ )
 +);
 +
 +bin2bcd u_bin2bcd_FxPeriod (
 +    .clk                     ( clk                  ),
 +    .rst_n ​                  ( rst_n                ),
 +    .start ​                  ( 1'​b1 ​                ),
 +    .bin_code ​               ( FxPeriod_quotient ​      ),
 +    .bcd_code ​               ( FxPeriod_quotient_code ​ )
 +);
 +
 +bin2bcd u_bin2bcd_DutyCnt (
 +    .clk                     ( clk                  ),
 +    .rst_n ​                  ( rst_n                ),
 +    .start ​                  ( 1'​b1 ​                ),
 +    .bin_code ​               ( DutyCnt_quotient ​      ),
 +    .bcd_code ​               ( DutyCnt_quotient_code ​ )
 +);
 +
 +bin2bcd u_bin2bcd_DelayDutyCnt (
 +    .clk                     ( clk                  ),
 +    .rst_n ​                  ( rst_n                ),
 +    .start ​                  ( 1'​b1 ​                ),
 +    .bin_code ​               ( DelayDutyCnt_quotient ​      ),
 +    .bcd_code ​               ( DelayDutyCnt_quotient_code ​ )
 +);
 +
 +endmodule ​
 +</​code>​
  
 --- ---
-Verilog代码+BCD转码之后的数据可以直接显示在OLED屏上了，但是为了看起来方便，我们对数据进行高位消零的操作。Verilog代码
 <code verilog> <code verilog>
 +//​==========================================================================
 +//
 +// Author: Step
 +// Module: zero_clear
 +// Description: ​
 +// Web: www.stepfapga.com
 +//​--------------------------------------------------------------------------
 +// Info:
 +//   ​V1.0---2021/​01/​14---Initial version
 +//
 +//​==========================================================================
  
 +//timescale
 +`timescale 1ns / 1ns
 +
 +//include
 +
 +//module
 +module zero_clear (
 +    input [39:0] Fxcnt_quotient_code,​
 +    input [39:0] FxPeriod_quotient_code,​
 +    input [11:0] DutyCnt_quotient_code,​
 +    input [11:0] DelayDutyCnt_quotient_code,​
 +
 +    output [79:0] data1,
 +    output [79:0] data2,
 +    output [31:0] data3,
 +    output [31:0] data4
 +);
 +
 +assign data1[72+:​8] = Fxcnt_quotient_code[36+:​ 4]? Fxcnt_quotient_code[36+:​4] : " ";
 +assign data1[64+:​8] = Fxcnt_quotient_code[32+:​ 8]? Fxcnt_quotient_code[32+:​4] : " ";
 +assign data1[56+:​8] = Fxcnt_quotient_code[28+:​12]?​ Fxcnt_quotient_code[28+:​4] : " ";
 +assign data1[48+:​8] = Fxcnt_quotient_code[24+:​16]?​ Fxcnt_quotient_code[24+:​4] : " ";
 +assign data1[40+:​8] = Fxcnt_quotient_code[20+:​20]?​ Fxcnt_quotient_code[20+:​4] : " ";
 +assign data1[32+:​8] = Fxcnt_quotient_code[16+:​24]?​ Fxcnt_quotient_code[16+:​4] : " ";
 +assign data1[24+:​8] = Fxcnt_quotient_code[12+:​28]?​ Fxcnt_quotient_code[12+:​4] : " ";
 +assign data1[16+:​8] = Fxcnt_quotient_code[ 8+:32]? Fxcnt_quotient_code[ 8+:4] : " ";
 +assign data1[ 8+:8] = Fxcnt_quotient_code[ 4+:36]? Fxcnt_quotient_code[ 4+:4] : " ";
 +assign data1[ 0+:8] = Fxcnt_quotient_code[ 0+: 4];
 +
 +
 +assign data2[72+:​8] = FxPeriod_quotient_code[36+:​4]?​ FxPeriod_quotient_code[36+:​4] : " ";
 +assign data2[64+:​8] = FxPeriod_quotient_code[32+:​8]?​ FxPeriod_quotient_code[32+:​4] : " ";
 +assign data2[56+:​8] = FxPeriod_quotient_code[28+:​12]?​ FxPeriod_quotient_code[28+:​4] : " ";
 +assign data2[48+:​8] = FxPeriod_quotient_code[24+:​16]?​ FxPeriod_quotient_code[24+:​4] : " ";
 +assign data2[40+:​8] = FxPeriod_quotient_code[20+:​20]?​ FxPeriod_quotient_code[20+:​4] : " ";
 +assign data2[32+:​8] = FxPeriod_quotient_code[16+:​24]?​ FxPeriod_quotient_code[16+:​4] : " ";
 +assign data2[24+:​8] = FxPeriod_quotient_code[12+:​28]?​ FxPeriod_quotient_code[12+:​4] : " ";
 +assign data2[16+:​8] = FxPeriod_quotient_code[ 8+:32]? FxPeriod_quotient_code[ 8+:4] : " ";
 +assign data2[ 8+:8] = FxPeriod_quotient_code[ 4+:36]? FxPeriod_quotient_code[ 4+:4] : " ";
 +assign data2[ 0+:8] = FxPeriod_quotient_code[ 0+: 4];
 +
 +
 +assign data3[24+:​8] = DutyCnt_quotient_code[8+:​4]?​ DutyCnt_quotient_code[8+:​4] : " ";
 +assign data3[16+:​8] = DutyCnt_quotient_code[4+:​4];​
 +assign data3[ 8+:8] = "​.";​
 +assign data3[ 0+:8] = DutyCnt_quotient_code[0+:​4];​
 +
 +
 +assign data4[24+:​8] = DelayDutyCnt_quotient_code[8+:​4]?​ DelayDutyCnt_quotient_code[8+:​4] : " ";
 +assign data4[16+:​8] = DelayDutyCnt_quotient_code[4+:​4];​
 +assign data4[ 8+:8] = "​.";​
 +assign data4[ 0+:8] = DelayDutyCnt_quotient_code[0+:​4];​
 +
 +endmodule //​zero_clear
 +</​code>​
 +
 +4. OLED显示实现
 +
 +---
 +板载的OLED屏模块采用SSD1306驱动芯片，128*32分辨率，网上有很多使用单片机驱动的案例可以参考，直接上代码，Verilog代码如下
 +
 +<code verilog>
 +// --------------------------------------------------------------------
 +// >>>>>>>>>>>>>>>>>>>>>>>>>​ COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<​
 +// --------------------------------------------------------------------
 +// Module: OLED12832
 +// 
 +// Author: Step
 +// 
 +// Description:​ OLED12832_Driver，使用8*8点阵字库，每行显示128/​8=16个字符
 +// 
 +// Web: www.stepfpga.com
 +// 
 +// --------------------------------------------------------------------
 +// Code Revision History :
 +// --------------------------------------------------------------------
 +// Version: |Mod. Date:   ​|Changes Made:
 +// V1.0     ​|2015/​11/​11 ​  ​|Initial ver
 +// --------------------------------------------------------------------
 +module OLED12832 (
 + input clk,​ //​12MHz系统时钟
 + input rst_n,​ //​系统复位，低有效
 +
 + input [79:​0] data1,​ //​
 + input [79:​0] data2,​ //​
 + input [79:​0] data3,​ //​
 + input [79:​0] data4,​ //​
 +
 + output reg oled_csn,​ //​OLCD液晶屏使能
 + output reg oled_rst,​ //​OLCD液晶屏复位
 + output reg oled_dcn,​ //​OLCD数据指令控制
 + output reg oled_clk,​ //​OLCD时钟信号
 + output reg oled_dat //​OLCD数据信号
 +);
 +
 + localparam INIT_DEPTH = 16'​d25;​ //​LCD初始化的命令的数量
 + localparam IDLE = 6'h1, MAIN = 6'h2, INIT = 6'h4, SCAN = 6'h8, WRITE = 6'h10, DELAY = 6'h20;
 + localparam HIGH = 1'b1, LOW = 1'b0;
 + localparam DATA = 1'b1, CMD = 1'b0;
 +
 + reg [7:0] cmd [24:0];
 + reg [39:0] mem [122:0];
 + reg [7:​0] y_p,​ x_ph, x_pl;
 + reg [(8*21-1):​0] char;
 + reg [7:​0] num,​ char_reg;​ //​
 + reg [4:​0] cnt_main,​ cnt_init, cnt_scan, cnt_write;
 + reg [15:​0] num_delay,​ cnt_delay, cnt;
 + reg [5:0] state, state_back;
 +
 + always@(posedge clk or negedge rst_n) begin
 + if(!rst_n) begin
 + cnt_main <= 1'b0; cnt_init <= 1'b0; cnt_scan <= 1'b0; cnt_write <= 1'b0;
 + y_p <= 1'b0; x_ph <= 1'b0; x_pl <= 1'b0;
 + num <= 1'b0; char <= 1'b0; char_reg <= 1'b0;
 + num_delay <= 16'd5; cnt_delay <= 1'b0; cnt <= 1'b0;
 + oled_csn <= HIGH; oled_rst <= HIGH; oled_dcn <= CMD; oled_clk <= HIGH; oled_dat <= LOW;
 + state <= IDLE; state_back <= IDLE;
 + end else begin
 + case(state)
 + IDLE:​begin
 + cnt_main <= 1'b0; cnt_init <= 1'b0; cnt_scan <= 1'b0; cnt_write <= 1'b0;
 + y_p <= 1'b0; x_ph <= 1'b0; x_pl <= 1'b0;
 + num <= 1'b0; char <= 1'b0; char_reg <= 1'b0;
 + num_delay <= 16'd5; cnt_delay <= 1'b0; cnt <= 1'b0;
 + oled_csn <= HIGH; oled_rst <= HIGH; oled_dcn <= CMD; oled_clk <= HIGH; oled_dat <= LOW;
 + state <= MAIN; state_back <= MAIN;
 + end
 + MAIN:​begin
 + if(cnt_main >= 5'd8) cnt_main <= 5'd5;
 + else cnt_main <= cnt_main + 1'b1;
 + case(cnt_main) //​MAIN状态
 + 5'​d0:​ begin state <= INIT; end
 + 5'​d1:​ begin y_p <= 8'hb0; x_ph <= 8'h10; x_pl <= 8'h00; num <= 5'd16; char <= "​F: ​           Hz";​state <= SCAN; end
 + 5'​d2:​ begin y_p <= 8'hb1; x_ph <= 8'h10; x_pl <= 8'h00; num <= 5'd16; char <= "​T: ​           ns";​state <= SCAN; end
 + 5'​d3:​ begin y_p <= 8'hb2; x_ph <= 8'h10; x_pl <= 8'h00; num <= 5'd16; char <= "​Duty: ​       . %";​state <= SCAN; end
 + 5'​d4:​ begin y_p <= 8'hb3; x_ph <= 8'h10; x_pl <= 8'h00; num <= 5'd16; char <= "​Phase: ​      . %";​state <= SCAN; end
 +
 + 5'​d5:​ begin y_p <= 8'hb0; x_ph <= 8'h12; x_pl <= 8'h00; num <= 5'd10; char <= data1; state <= SCAN; end
 + 5'​d6:​ begin y_p <= 8'hb1; x_ph <= 8'h12; x_pl <= 8'h00; num <= 5'd10; char <= data2; state <= SCAN; end
 + 5'​d7:​ begin y_p <= 8'hb2; x_ph <= 8'h15; x_pl <= 8'h08; num <= 5'd4; char <= data3; state <= SCAN; end
 + 5'​d8:​ begin y_p <= 8'hb3; x_ph <= 8'h15; x_pl <= 8'h08; num <= 5'd4; char <= data4; state <= SCAN; end
 +
 + default:​ state <= IDLE;
 + endcase
 + end
 + INIT:​begin //​初始化状态
 + case(cnt_init)
 + 5'​d0:​ begin oled_rst <= LOW; cnt_init <= cnt_init + 1'b1; end //​复位有效
 + 5'​d1:​ begin num_delay <= 16'​d25000;​ state <= DELAY; state_back <= INIT; cnt_init <= cnt_init + 1'b1; end //​延时大于3us
 + 5'​d2:​ begin oled_rst <= HIGH; cnt_init <= cnt_init + 1'b1; end //​复位恢复
 + 5'​d3:​ begin num_delay <= 16'​d25000;​ state <= DELAY; state_back <= INIT; cnt_init <= cnt_init + 1'b1; end //​延时大于220us
 + 5'​d4:​ begin ​
 + if(cnt>​=INIT_DEPTH) begin //​当25条指令及数据发出后，配置完成
 + cnt <= 1'b0;
 + cnt_init <= cnt_init + 1'b1;
 + end else begin
 + cnt <= cnt + 1'b1; num_delay <= 16'd5;
 + oled_dcn <= CMD; char_reg <= cmd[cnt]; state <= WRITE; state_back <= INIT;
 + end
 + end
 + 5'​d5:​ begin cnt_init <= 1'b0; state <= MAIN; end //​初始化完成，返回MAIN状态
 + default:​ state <= IDLE;
 + endcase
 + end
 + SCAN:​begin //​刷屏状态，从RAM中读取数据刷屏
 + if(cnt_scan == 5'd11) begin
 + if(num) cnt_scan <= 5'd3;
 + else cnt_scan <= cnt_scan + 1'b1;
 + end else if(cnt_scan == 5'd12) cnt_scan <= 1'b0;
 + else cnt_scan <= cnt_scan + 1'b1;
 + case(cnt_scan)
 + 5'​d 0: begin oled_dcn <= CMD; char_reg <= y_p; state <= WRITE; state_back <= SCAN; end //​定位列页地址
 + 5'​d 1: begin oled_dcn <= CMD; char_reg <= x_pl; state <= WRITE; state_back <= SCAN; end //​定位行地址低位
 + 5'​d 2: begin oled_dcn <= CMD; char_reg <= x_ph; state <= WRITE; state_back <= SCAN; end //​定位行地址高位
 +
 + 5'​d 3: begin num <= num - 1'​b1;​end
 + 5'​d 4: begin oled_dcn <= DATA; char_reg <= 8'h00; state <= WRITE; state_back <= SCAN; end //​将5*8点阵编程8*8
 + 5'​d 5: begin oled_dcn <= DATA; char_reg <= 8'h00; state <= WRITE; state_back <= SCAN; end //​将5*8点阵编程8*8
 + 5'​d 6: begin oled_dcn <= DATA; char_reg <= 8'h00; state <= WRITE; state_back <= SCAN; end //​将5*8点阵编程8*8
 + 5'​d 7: begin oled_dcn <= DATA; char_reg <= mem[char[(num*8)+:​8]][39:​32];​ state <= WRITE; state_back <= SCAN; end
 + 5'​d 8: begin oled_dcn <= DATA; char_reg <= mem[char[(num*8)+:​8]][31:​24];​ state <= WRITE; state_back <= SCAN; end
 + 5'​d 9: begin oled_dcn <= DATA; char_reg <= mem[char[(num*8)+:​8]][23:​16];​ state <= WRITE; state_back <= SCAN; end
 + 5'​d10:​ begin oled_dcn <= DATA; char_reg <= mem[char[(num*8)+:​8]][15:​ 8]; state <= WRITE; state_back <= SCAN; end
 + 5'​d11:​ begin oled_dcn <= DATA; char_reg <= mem[char[(num*8)+:​8]][ 7: 0]; state <= WRITE; state_back <= SCAN; end
 + 5'​d12:​ begin state <= MAIN; end
 + default:​ state <= IDLE;
 + endcase
 + end
 + WRITE:​begin //​WRITE状态，将数据按照SPI时序发送给屏幕
 + if(cnt_write >= 5'd17) cnt_write <= 1'b0;
 + else cnt_write <= cnt_write + 1'b1;
 + case(cnt_write)
 + 5'​d 0: begin oled_csn <= LOW; end //​9位数据最高位为命令数据控制位
 + 5'​d 1: begin oled_clk <= LOW; oled_dat <= char_reg[7];​ end //​先发高位数据
 + 5'​d 2: begin oled_clk <= HIGH; end
 + 5'​d 3: begin oled_clk <= LOW; oled_dat <= char_reg[6];​ end
 + 5'​d 4: begin oled_clk <= HIGH; end
 + 5'​d 5: begin oled_clk <= LOW; oled_dat <= char_reg[5];​ end
 + 5'​d 6: begin oled_clk <= HIGH; end
 + 5'​d 7: begin oled_clk <= LOW; oled_dat <= char_reg[4];​ end
 + 5'​d 8: begin oled_clk <= HIGH; end
 + 5'​d 9: begin oled_clk <= LOW; oled_dat <= char_reg[3];​ end
 + 5'​d10:​ begin oled_clk <= HIGH; end
 + 5'​d11:​ begin oled_clk <= LOW; oled_dat <= char_reg[2];​ end
 + 5'​d12:​ begin oled_clk <= HIGH; end
 + 5'​d13:​ begin oled_clk <= LOW; oled_dat <= char_reg[1];​ end
 + 5'​d14:​ begin oled_clk <= HIGH; end
 + 5'​d15:​ begin oled_clk <= LOW; oled_dat <= char_reg[0];​ end //​后发低位数据
 + 5'​d16:​ begin oled_clk <= HIGH; end
 + 5'​d17:​ begin oled_csn <= HIGH; state <= DELAY; end //
 + default:​ state <= IDLE;
 + endcase
 + end
 + DELAY:​begin //​延时状态
 + if(cnt_delay >= num_delay) begin
 + cnt_delay <= 16'd0; state <= state_back; ​
 + end else cnt_delay <= cnt_delay + 1'b1;
 + end
 + default:​state <= IDLE;
 + endcase
 + end
 + end
 +
 + //​OLED配置指令数据
 + always@(posedge rst_n)
 + begin
 + cmd[ 0] = {8'​hae}; ​
 + cmd[ 1] = {8'​h00}; ​
 + cmd[ 2] = {8'​h10}; ​
 + cmd[ 3] = {8'​h00}; ​
 + cmd[ 4] = {8'​hb0}; ​
 + cmd[ 5] = {8'​h81}; ​
 + cmd[ 6] = {8'​hff}; ​
 + cmd[ 7] = {8'​ha1}; ​
 + cmd[ 8] = {8'​ha6}; ​
 + cmd[ 9] = {8'​ha8}; ​
 + cmd[10] = {8'​h1f}; ​
 + cmd[11] = {8'​hc8};​
 + cmd[12] = {8'​hd3};​
 + cmd[13] = {8'​h00};​
 + cmd[14] = {8'​hd5};​
 + cmd[15] = {8'​h80};​
 + cmd[16] = {8'​hd9};​
 + cmd[17] = {8'​h1f};​
 + cmd[18] = {8'​hda};​
 + cmd[19] = {8'​h00};​
 + cmd[20] = {8'​hdb};​
 + cmd[21] = {8'​h40};​
 + cmd[22] = {8'​h8d};​
 + cmd[23] = {8'​h14};​
 + cmd[24] = {8'​haf};​
 + end 
 +
 + //​5*8点阵字库数据
 + always@(posedge rst_n)
 + begin
 + mem[ ​ 0] = {8'​h3E,​ 8'h51, 8'h49, 8'h45, 8'​h3E}; ​  // 48  0
 + mem[ ​ 1] = {8'​h00,​ 8'h42, 8'h7F, 8'h40, 8'​h00}; ​  // 49  1
 + mem[ ​ 2] = {8'​h42,​ 8'h61, 8'h51, 8'h49, 8'​h46}; ​  // 50  2
 + mem[ ​ 3] = {8'​h21,​ 8'h41, 8'h45, 8'h4B, 8'​h31}; ​  // 51  3
 + mem[ ​ 4] = {8'​h18,​ 8'h14, 8'h12, 8'h7F, 8'​h10}; ​  // 52  4
 + mem[ ​ 5] = {8'​h27,​ 8'h45, 8'h45, 8'h45, 8'​h39}; ​  // 53  5
 + mem[ ​ 6] = {8'​h3C,​ 8'h4A, 8'h49, 8'h49, 8'​h30}; ​  // 54  6
 + mem[ ​ 7] = {8'​h01,​ 8'h71, 8'h09, 8'h05, 8'​h03}; ​  // 55  7
 + mem[ ​ 8] = {8'​h36,​ 8'h49, 8'h49, 8'h49, 8'​h36}; ​  // 56  8
 + mem[ ​ 9] = {8'​h06,​ 8'h49, 8'h49, 8'h29, 8'​h1E}; ​  // 57  9
 + mem[ 10] = {8'​h7C,​ 8'h12, 8'h11, 8'h12, 8'​h7C}; ​  // 65  A
 + mem[ 11] = {8'​h7F,​ 8'h49, 8'h49, 8'h49, 8'​h36}; ​  // 66  B
 + mem[ 12] = {8'​h3E,​ 8'h41, 8'h41, 8'h41, 8'​h22}; ​  // 67  C
 + mem[ 13] = {8'​h7F,​ 8'h41, 8'h41, 8'h22, 8'​h1C}; ​  // 68  D
 + mem[ 14] = {8'​h7F,​ 8'h49, 8'h49, 8'h49, 8'​h41}; ​  // 69  E
 + mem[ 15] = {8'​h7F,​ 8'h09, 8'h09, 8'h09, 8'​h01}; ​  // 70  F
 +
 + mem[ 32] = {8'​h00,​ 8'h00, 8'h00, 8'h00, 8'​h00}; ​  // 32  sp 
 + mem[ 33] = {8'​h00,​ 8'h00, 8'h2f, 8'h00, 8'​h00}; ​  // 33  !  ​
 + mem[ 34] = {8'​h00,​ 8'h07, 8'h00, 8'h07, 8'​h00}; ​  // 34  ​
 + mem[ 35] = {8'​h14,​ 8'h7f, 8'h14, 8'h7f, 8'​h14}; ​  // 35  #
 + mem[ 36] = {8'​h24,​ 8'h2a, 8'h7f, 8'h2a, 8'​h12}; ​  // 36  $
 + mem[ 37] = {8'​h62,​ 8'h64, 8'h08, 8'h13, 8'​h23}; ​  // 37  %
 + mem[ 38] = {8'​h36,​ 8'h49, 8'h55, 8'h22, 8'​h50}; ​  // 38  &
 + mem[ 39] = {8'​h00,​ 8'h05, 8'h03, 8'h00, 8'​h00}; ​  // 39  '
 + mem[ 40] = {8'​h00,​ 8'h1c, 8'h22, 8'h41, 8'​h00}; ​  // 40  (
 + mem[ 41] = {8'​h00,​ 8'h41, 8'h22, 8'h1c, 8'​h00}; ​  // 41  )
 + mem[ 42] = {8'​h14,​ 8'h08, 8'h3E, 8'h08, 8'​h14}; ​  // 42  *
 + mem[ 43] = {8'​h08,​ 8'h08, 8'h3E, 8'h08, 8'​h08}; ​  // 43  +
 + mem[ 44] = {8'​h00,​ 8'h00, 8'hA0, 8'h60, 8'​h00}; ​  // 44  ,
 + mem[ 45] = {8'​h08,​ 8'h08, 8'h08, 8'h08, 8'​h08}; ​  // 45  -
 + mem[ 46] = {8'​h00,​ 8'h60, 8'h60, 8'h00, 8'​h00}; ​  // 46  .
 + mem[ 47] = {8'​h20,​ 8'h10, 8'h08, 8'h04, 8'​h02}; ​  // 47  /
 + mem[ 48] = {8'​h3E,​ 8'h51, 8'h49, 8'h45, 8'​h3E}; ​  // 48  0
 + mem[ 49] = {8'​h00,​ 8'h42, 8'h7F, 8'h40, 8'​h00}; ​  // 49  1
 + mem[ 50] = {8'​h42,​ 8'h61, 8'h51, 8'h49, 8'​h46}; ​  // 50  2
 + mem[ 51] = {8'​h21,​ 8'h41, 8'h45, 8'h4B, 8'​h31}; ​  // 51  3
 + mem[ 52] = {8'​h18,​ 8'h14, 8'h12, 8'h7F, 8'​h10}; ​  // 52  4
 + mem[ 53] = {8'​h27,​ 8'h45, 8'h45, 8'h45, 8'​h39}; ​  // 53  5
 + mem[ 54] = {8'​h3C,​ 8'h4A, 8'h49, 8'h49, 8'​h30}; ​  // 54  6
 + mem[ 55] = {8'​h01,​ 8'h71, 8'h09, 8'h05, 8'​h03}; ​  // 55  7
 + mem[ 56] = {8'​h36,​ 8'h49, 8'h49, 8'h49, 8'​h36}; ​  // 56  8
 + mem[ 57] = {8'​h06,​ 8'h49, 8'h49, 8'h29, 8'​h1E}; ​  // 57  9
 + mem[ 58] = {8'​h00,​ 8'h36, 8'h36, 8'h00, 8'​h00}; ​  // 58  :
 + mem[ 59] = {8'​h00,​ 8'h56, 8'h36, 8'h00, 8'​h00}; ​  // 59  ;
 + mem[ 60] = {8'​h08,​ 8'h14, 8'h22, 8'h41, 8'​h00}; ​  // 60  <
 + mem[ 61] = {8'​h14,​ 8'h14, 8'h14, 8'h14, 8'​h14}; ​  // 61  =
 + mem[ 62] = {8'​h00,​ 8'h41, 8'h22, 8'h14, 8'​h08}; ​  // 62  >
 + mem[ 63] = {8'​h02,​ 8'h01, 8'h51, 8'h09, 8'​h06}; ​  // 63  ?
 + mem[ 64] = {8'​h32,​ 8'h49, 8'h59, 8'h51, 8'​h3E}; ​  // 64  @
 + mem[ 65] = {8'​h7C,​ 8'h12, 8'h11, 8'h12, 8'​h7C}; ​  // 65  A
 + mem[ 66] = {8'​h7F,​ 8'h49, 8'h49, 8'h49, 8'​h36}; ​  // 66  B
 + mem[ 67] = {8'​h3E,​ 8'h41, 8'h41, 8'h41, 8'​h22}; ​  // 67  C
 + mem[ 68] = {8'​h7F,​ 8'h41, 8'h41, 8'h22, 8'​h1C}; ​  // 68  D
 + mem[ 69] = {8'​h7F,​ 8'h49, 8'h49, 8'h49, 8'​h41}; ​  // 69  E
 + mem[ 70] = {8'​h7F,​ 8'h09, 8'h09, 8'h09, 8'​h01}; ​  // 70  F
 + mem[ 71] = {8'​h3E,​ 8'h41, 8'h49, 8'h49, 8'​h7A}; ​  // 71  G
 + mem[ 72] = {8'​h7F,​ 8'h08, 8'h08, 8'h08, 8'​h7F}; ​  // 72  H
 + mem[ 73] = {8'​h00,​ 8'h41, 8'h7F, 8'h41, 8'​h00}; ​  // 73  I
 + mem[ 74] = {8'​h20,​ 8'h40, 8'h41, 8'h3F, 8'​h01}; ​  // 74  J
 + mem[ 75] = {8'​h7F,​ 8'h08, 8'h14, 8'h22, 8'​h41}; ​  // 75  K
 + mem[ 76] = {8'​h7F,​ 8'h40, 8'h40, 8'h40, 8'​h40}; ​  // 76  L
 + mem[ 77] = {8'​h7F,​ 8'h02, 8'h0C, 8'h02, 8'​h7F}; ​  // 77  M
 + mem[ 78] = {8'​h7F,​ 8'h04, 8'h08, 8'h10, 8'​h7F}; ​  // 78  N
 + mem[ 79] = {8'​h3E,​ 8'h41, 8'h41, 8'h41, 8'​h3E}; ​  // 79  O
 + mem[ 80] = {8'​h7F,​ 8'h09, 8'h09, 8'h09, 8'​h06}; ​  // 80  P
 + mem[ 81] = {8'​h3E,​ 8'h41, 8'h51, 8'h21, 8'​h5E}; ​  // 81  Q
 + mem[ 82] = {8'​h7F,​ 8'h09, 8'h19, 8'h29, 8'​h46}; ​  // 82  R
 + mem[ 83] = {8'​h46,​ 8'h49, 8'h49, 8'h49, 8'​h31}; ​  // 83  S
 + mem[ 84] = {8'​h01,​ 8'h01, 8'h7F, 8'h01, 8'​h01}; ​  // 84  T
 + mem[ 85] = {8'​h3F,​ 8'h40, 8'h40, 8'h40, 8'​h3F}; ​  // 85  U
 + mem[ 86] = {8'​h1F,​ 8'h20, 8'h40, 8'h20, 8'​h1F}; ​  // 86  V
 + mem[ 87] = {8'​h3F,​ 8'h40, 8'h38, 8'h40, 8'​h3F}; ​  // 87  W
 + mem[ 88] = {8'​h63,​ 8'h14, 8'h08, 8'h14, 8'​h63}; ​  // 88  X
 + mem[ 89] = {8'​h07,​ 8'h08, 8'h70, 8'h08, 8'​h07}; ​  // 89  Y
 + mem[ 90] = {8'​h61,​ 8'h51, 8'h49, 8'h45, 8'​h43}; ​  // 90  Z
 + mem[ 91] = {8'​h00,​ 8'h7F, 8'h41, 8'h41, 8'​h00}; ​  // 91  [
 + mem[ 92] = {8'​h55,​ 8'h2A, 8'h55, 8'h2A, 8'​h55}; ​  // 92  .
 + mem[ 93] = {8'​h00,​ 8'h41, 8'h41, 8'h7F, 8'​h00}; ​  // 93  ]
 + mem[ 94] = {8'​h04,​ 8'h02, 8'h01, 8'h02, 8'​h04}; ​  // 94  ^
 + mem[ 95] = {8'​h40,​ 8'h40, 8'h40, 8'h40, 8'​h40}; ​  // 95  _
 + mem[ 96] = {8'​h00,​ 8'h01, 8'h02, 8'h04, 8'​h00}; ​  // 96  '
 + mem[ 97] = {8'​h20,​ 8'h54, 8'h54, 8'h54, 8'​h78}; ​  // 97  a
 + mem[ 98] = {8'​h7F,​ 8'h48, 8'h44, 8'h44, 8'​h38}; ​  // 98  b
 + mem[ 99] = {8'​h38,​ 8'h44, 8'h44, 8'h44, 8'​h20}; ​  // 99  c
 + mem[100] = {8'​h38,​ 8'h44, 8'h44, 8'h48, 8'​h7F}; ​  // 100 d
 + mem[101] = {8'​h38,​ 8'h54, 8'h54, 8'h54, 8'​h18}; ​  // 101 e
 + mem[102] = {8'​h08,​ 8'h7E, 8'h09, 8'h01, 8'​h02}; ​  // 102 f
 + mem[103] = {8'​h18,​ 8'hA4, 8'hA4, 8'hA4, 8'​h7C}; ​  // 103 g
 + mem[104] = {8'​h7F,​ 8'h08, 8'h04, 8'h04, 8'​h78}; ​  // 104 h
 + mem[105] = {8'​h00,​ 8'h44, 8'h7D, 8'h40, 8'​h00}; ​  // 105 i
 + mem[106] = {8'​h40,​ 8'h80, 8'h84, 8'h7D, 8'​h00}; ​  // 106 j
 + mem[107] = {8'​h7F,​ 8'h10, 8'h28, 8'h44, 8'​h00}; ​  // 107 k
 + mem[108] = {8'​h00,​ 8'h41, 8'h7F, 8'h40, 8'​h00}; ​  // 108 l
 + mem[109] = {8'​h7C,​ 8'h04, 8'h18, 8'h04, 8'​h78}; ​  // 109 m
 + mem[110] = {8'​h7C,​ 8'h08, 8'h04, 8'h04, 8'​h78}; ​  // 110 n
 + mem[111] = {8'​h38,​ 8'h44, 8'h44, 8'h44, 8'​h38}; ​  // 111 o
 + mem[112] = {8'​hFC,​ 8'h24, 8'h24, 8'h24, 8'​h18}; ​  // 112 p
 + mem[113] = {8'​h18,​ 8'h24, 8'h24, 8'h18, 8'​hFC}; ​  // 113 q
 + mem[114] = {8'​h7C,​ 8'h08, 8'h04, 8'h04, 8'​h08}; ​  // 114 r
 + mem[115] = {8'​h48,​ 8'h54, 8'h54, 8'h54, 8'​h20}; ​  // 115 s
 + mem[116] = {8'​h04,​ 8'h3F, 8'h44, 8'h40, 8'​h20}; ​  // 116 t
 + mem[117] = {8'​h3C,​ 8'h40, 8'h40, 8'h20, 8'​h7C}; ​  // 117 u
 + mem[118] = {8'​h1C,​ 8'h20, 8'h40, 8'h20, 8'​h1C}; ​  // 118 v
 + mem[119] = {8'​h3C,​ 8'h40, 8'h30, 8'h40, 8'​h3C}; ​  // 119 w
 + mem[120] = {8'​h44,​ 8'h28, 8'h10, 8'h28, 8'​h44}; ​  // 120 x
 + mem[121] = {8'​h1C,​ 8'hA0, 8'hA0, 8'hA0, 8'​h7C}; ​  // 121 y
 + mem[122] = {8'​h44,​ 8'h64, 8'h54, 8'h4C, 8'​h44}; ​  // 122 z
 + end
 +
 +endmodule
 </​code>​ </​code>​