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[/] [eco32/] [tags/] [eco32-0.26/] [fpga/] [src/] [ser/] [xmt.v] - Rev 117
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// // xmt.v -- serial line transmitter // module xmt(clk, reset, load, empty, parallel_in, serial_out); input clk; input reset; input load; output reg empty; input [7:0] parallel_in; output serial_out; reg [3:0] state; reg [8:0] shift; reg [10:0] count; assign serial_out = shift[0]; always @(posedge clk) begin if (reset == 1) begin state <= 4'h0; shift <= 9'b111111111; empty <= 1; end else begin if (state == 4'h0) begin if (load == 1) begin state <= 4'h1; shift <= { parallel_in, 1'b0 }; count <= 1302; empty <= 0; end end else if (state == 4'hb) begin state <= 4'h0; empty <= 1; end else begin if (count == 0) begin state <= state + 1; shift[8:0] <= { 1'b1, shift[8:1] }; count <= 1302; end else begin count <= count - 1; end end end end endmodule
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