Subversion Repositories uart2bus

//---------------------------------------------------------------------------------------

// uart top level module  

//

//---------------------------------------------------------------------------------------

module uart_top

(

        // global signals 

        clock, reset,

        // uart serial signals 

        ser_in, ser_out,

        // transmit and receive internal interface signals 

        rx_data, new_rx_data,

        tx_data, new_tx_data, tx_busy,

        // baud rate configuration register - see baud_gen.v for details 

        baud_freq, baud_limit,

        baud_clk

);

//---------------------------------------------------------------------------------------

// modules inputs and outputs 

input                   clock;                  // global clock input 

input                   reset;                  // global reset input 

input                   ser_in;                 // serial data input 

output                  ser_out;                // serial data output 

input   [7:0]    tx_data;                // data byte to transmit 

input                   new_tx_data;    // asserted to indicate that there is a new data byte for transmission 

output                  tx_busy;                // signs that transmitter is busy 

output  [7:0]    rx_data;                // data byte received 

output                  new_rx_data;    // signs that a new byte was received 

input   [11:0]   baud_freq;      // baud rate setting registers - see header description 

input   [15:0]   baud_limit;

output                  baud_clk;

// internal wires 

wire ce_16;             // clock enable at bit rate 

assign baud_clk = ce_16;

//---------------------------------------------------------------------------------------

// module implementation 

// baud rate generator module 

baud_gen baud_gen_1

(

        .clock(clock), .reset(reset),

        .ce_16(ce_16), .baud_freq(baud_freq), .baud_limit(baud_limit)

);

// uart receiver 

uart_rx uart_rx_1

(

        .clock(clock), .reset(reset),

        .ce_16(ce_16), .ser_in(ser_in),

        .rx_data(rx_data), .new_rx_data(new_rx_data)

);

// uart transmitter 

uart_tx  uart_tx_1

(

        .clock(clock), .reset(reset),

        .ce_16(ce_16), .tx_data(tx_data), .new_tx_data(new_tx_data),

        .ser_out(ser_out), .tx_busy(tx_busy)

);

endmodule

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//                                              Th.. Th.. Th.. Thats all folks !!!

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