ps2_vga_top.v

ps/2键盘输入的字符在VGA上进行显示. 本示例是将ps/2键盘输入的字符在VGA上进行显示。在做此实验之前最好先学习PS2键盘接口。

module ps2_vga_top(
    clk,
    rst_n,
    
    ps2_clk,
    ps2_data, 
        
    vga_hs, 
    vga_vs, 
    vga_r0,  
    vga_g0,  
    vga_b0  
    );

input 	clk;
input   rst_n ;// synthesis attribute clock_buffer of rst_n is ibufg;
inout   ps2_clk;
inout   ps2_data;
output 	vga_hs;
output  vga_vs; // sync signals for monitor
output 	vga_r0, vga_g0, vga_b0;

wire [4:0] ps2_status;
wire ps2_key_data_ready;
wire ps2_key_read_ready;
wire ps2_key_released;
wire tx_write;
wire [7:0] ps2_ascii;
wire [7:0] ps2_scan_code;
wire [7:0] tx_data;
wire ps2_tx_write_ack_o;

    
ps2_vga ps2_vga_inst(
    .clk            ( clk ),
    .rst_n          ( rst_n ),
    .ps2_ascii      ( ps2_ascii ),
    .ps2_data_ready ( ps2_key_data_ready ),
    .ps2_read       ( ps2_key_read_ready ),
    .fg_color       ( 3'b111 ), // white
    .bg_color       ( 3'b000),  // black
    .vga_hs         ( vga_hs ), 
    .vga_vs         ( vga_vs ),
    .vga_r0         ( vga_r0 ), 
    .vga_g0         ( vga_g0 ), 
    .vga_b0         ( vga_b0 )
    );
 
//-----------------------------------------------------------    
ps2_keyboard #(3000, // number of clks for 60usec.
               12,   // number of bits needed for 60usec. timer
               1000000,  // number of clks for debounce
               20,    // number of bits needed for debounce timer
               1     // Trap the shift keys, no event generated
               )                       
  keyboard_block (            // Instance name
  .clk                      ( clk ),
  .reset                    ( !rst_n ),
  .ps2_clk                  ( ps2_clk ),
  .ps2_data                 ( ps2_data ),
  .rx_extended              ( ps2_status[1] ),
  .rx_released              ( ps2_key_released ),
  .rx_shift_key_on          ( ps2_status[3] ),
  .rx_scan_code             ( ps2_scan_code ),
  .rx_ascii                 ( ps2_ascii ),
  .rx_data_ready            ( ps2_key_data_ready ),
  .rx_read                  ( ps2_key_read_ready ),
  .tx_data                  ( tx_data ),
  .tx_write                 ( tx_write ),
  .tx_write_ack_o           ( ps2_tx_write_ack_o ),
  .tx_error_no_keyboard_ack ( ps2_status[4] )
  );

endmodule