ТЕМА: Вопросы по "коду"

module USART (clk,RxD,RxD_data_ready,RxD_endofpacket,OversamplingTick,dataout,debugRx,debugSampleNow,debugRxD_bit);
input clk;
input RxD;
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
output reg [7:0] dataout;                     //leds
output reg RxD_data_ready = 0;
output reg RxD_endofpacket = 0;           // asserted for one clock cycle when a packet has been detected (i.e. RxD_idle is going high)  
output wire OversamplingTick;             //115200*8=921600//oversampling     
output wire debugRx; 
output wire debugSampleNow;
output reg debugRxD_bit;                           
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
parameter BaudGeneratorInc_rx = 11'd1213;  //11'd1214;//50000000/(115200*8)~54->65535/54=1213
reg [15:0] BaudGeneratorAcc_rx;           //2^16-1 = 65535 максимальное число,которое можно поместить в 16 бит
parameter Oversampling = 8;    
reg [2:0] OversamplingCnt = 0;             //2^3 = 8 должен сам себя сбрасывать в 0!!!!!
assign debugSampleNow = sampleNow; 
//======================================================================================//
//+++++++++++++++++++++++|USART rx oversampling baudrate 921600|++++++++++++++++++++++++//
//======================================================================================//
always @(posedge clk)// 50MHz
  begin
  BaudGeneratorAcc_rx <= BaudGeneratorAcc_rx + BaudGeneratorInc_rx;//если чатота передачика 115200 бод то принимать нужно 115200*8=921600
  end                                                              //получилось примерно 926000
 assign  OversamplingTick = BaudGeneratorAcc_rx[15]; // 16 бит будет равен 1 либо 0 это и есть наш тактирующий сигнал
//=======================================================================================//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
//======================================================================================//
always @(posedge OversamplingTick) OversamplingCnt <=  OversamplingCnt + 1'd1;
wire sampleNow = OversamplingTick && (OversamplingCnt==2'd3); 

always @(posedge sampleNow)debugRxD_bit<=~debugRxD_bit; 

endmodule

module USART (clk,RxD,RxD_data_ready,RxD_endofpacket,OversamplingTick,dataout,debugRx,debugSampleNow,debugRxD_bit);
input clk;
input RxD;
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
output reg [7:0] dataout;                     //leds
output reg RxD_data_ready = 0;
output reg RxD_endofpacket = 0;         
output wire OversamplingTick;            
output wire debugRx; 
output wire debugSampleNow;
output reg debugRxD_bit;                           
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
parameter BaudGeneratorInc_rx = 8'd151;  //11'd1214;//50000000/115200~434->65535/151~434
reg [15:0] BaudGeneratorAcc_rx;           //2^16-1 = 65535 максимальное число,которое можно поместить в 16 бит
assign debugRx=RxD; 
//======================================================================================//
//+++++++++++++++++++++++|USART rx oversampling baudrate 921600|++++++++++++++++++++++++//
//======================================================================================//
always @(posedge clk)// 50MHz
  begin
  BaudGeneratorAcc_rx <= BaudGeneratorAcc_rx + BaudGeneratorInc_rx;
  end               
 assign  OversamplingTick = BaudGeneratorAcc_rx[15]; // 16 бит будет равен 1 либо 0 это и есть наш тактирующий сигнал
//=======================================================================================//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
//======================================================================================//

always @(posedge OversamplingTick)debugRxD_bit<=~debugRxD_bit;

endmodule