?? _422_receiver_1.v.bak
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//同步串口接收模塊//原作者:劉通////// module _422_receiver_1(reset,sdin,sys_clock,sclk,r_enable ,dout,wrn //,bit_counter_2 //,state );input reset,sdin,sys_clock,sclk,r_enable;output wrn;output [7:0]dout;//output bit_counter_2;//output [1:0]state;//-------------------------------------wire bit_counter_2;reg wrn;reg [7:0]dout;wire [7:0] dout;reg [7:0]data;reg [2:0]bit_counter;reg data_receive_begin;reg [1:0]state;wire bit_counter_or;reg bit_counter_or_reg;reg data_receive_begin_reg;///////////////////////////////////////////////////////////assign bit_counter_2=bit_counter[2];//assign dout=data;assign bit_counter_or=|bit_counter;//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////always @(negedge sclk or negedge reset)begin if (!reset) data<=8'b0; else if(r_enable) data[7:0]<={sdin,data[7:1]}; else data<=8'b0; end/////////////////////////////////////////////////////////always @(negedge sclk or negedge reset)begin if (!reset) bit_counter<=3'd0; else if(r_enable) bit_counter<=bit_counter+3'd1; else bit_counter<=3'd0;end/////////////////////////////////////////////////////////always @(negedge sclk or negedge reset)begin if (!reset) data_receive_begin<=1'b0; else if(r_enable) data_receive_begin<=1'b1; else data_receive_begin<=1'b0;end/////////////////////////////////////////////////////////always @(posedge sys_clock)begin bit_counter_or_reg<=bit_counter_or; data_receive_begin_reg<=data_receive_begin;endalways @(posedge sys_clock or negedge reset)begin if(!reset) begin dout<=8'd0; wrn<=1'b0; state<=2'b00; end else if((bit_counter_or_reg==1'b0)&&(data_receive_begin_reg==1'b1)) case(state) 2'b00: begin dout<=data; wrn<=1'b1; state<=2'b01; end 2'b01: begin wrn<=1'b0; state<=2'b11; end default: begin state<=state; wrn<=1'b0; end endcase else begin dout<=8'd0;//更改了此句話后,寫錯(cuò)的數(shù)據(jù)就變成了00H(原來寫錯(cuò)的數(shù)為沒錯(cuò)之前的一個(gè)數(shù))。 wrn<=1'b0; state<=2'b00; endend//-------------------------------------------------------////////////////////////////////////////////////////////endmodule
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