uart_tx.v

vhdl语言编写的实现uart协议的程序,用于rs232电气接口程序开发.支持比特率从2400-115200.

`timescale 1 ps / 1ps

module uart_tx
(	data_in,
	write_buffer,
	reset_buffer,
	en_16_x_baud,
	serial_out,
	buffer_full,
	buffer_half_full,
	clk);

input[7:0] 	data_in;
input 	write_buffer;
input 	reset_buffer;
input 	en_16_x_baud;
output 	serial_out;
output 	buffer_full;
output 	buffer_half_full;
input 	clk;

wire  [7:0] data_in;
wire   	write_buffer;
wire   	reset_buffer;
wire   	en_16_x_baud;
wire   	serial_out;
wire   	buffer_full;
wire   	buffer_half_full;
wire   	clk;

//----------------------------------------------------------------------------------
//
// Start of UART_TX
//	 
//
//----------------------------------------------------------------------------------
//
// Signals used in UART_TX
//
//----------------------------------------------------------------------------------
//
wire [7:0] 	fifo_data_out;
wire  	fifo_data_present;
wire  	fifo_read;
//
//----------------------------------------------------------------------------------
//
// Start of UART_TX circuit description
//
//----------------------------------------------------------------------------------
//	

  // 8 to 1 multiplexer to convert parallel data to serial
kcuart_tx kcuart
(	.data_in(fifo_data_out),
    	.send_character(fifo_data_present),
    	.en_16_x_baud(en_16_x_baud),
    	.serial_out(serial_out),
    	.Tx_complete(fifo_read),
    	.clk(clk));

bbfifo_16x8 buf_0
(	.data_in(data_in),
    	.data_out(fifo_data_out),
    	.reset(reset_buffer),
    	.write(write_buffer),
    	.read(fifo_read),
    	.full(buffer_full),
    	.half_full(buffer_half_full),
    	.data_present(fifo_data_present),
    	.clk(clk));

endmodule

//----------------------------------------------------------------------------------
//
// END OF FILE UART_TX.V
//
//----------------------------------------------------------------------------------