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https://opencores.org/ocsvn/eco32/eco32/trunk
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[/] [eco32/] [trunk/] [fpga/] [mc/] [src/] [ser/] [xmtbuf.v] - Rev 27
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module xmtbuf(clk, reset, write, ready, data_in, serial_out); input clk; input reset; input write; output reg ready; input [7:0] data_in; output serial_out; reg [1:0] state; reg [7:0] data_hold; reg load; wire empty; xmt xmt1(clk, reset, load, empty, data_hold, serial_out); always @(posedge clk) begin if (reset == 1) begin state <= 2'b00; ready <= 1; load <= 0; end else begin case (state) 2'b00: begin if (write == 1) begin state <= 2'b01; data_hold <= data_in; ready <= 0; load <= 1; end end 2'b01: begin state <= 2'b10; ready <= 1; load <= 0; end 2'b10: begin if (empty == 1 && write == 0) begin state <= 2'b00; ready <= 1; load <= 0; end else if (empty == 1 && write == 1) begin state <= 2'b01; data_hold <= data_in; ready <= 0; load <= 1; end else if (empty == 0 && write == 1) begin state <= 2'b11; data_hold <= data_in; ready <= 0; load <= 0; end end 2'b11: begin if (empty == 1) begin state <= 2'b01; ready <= 0; load <= 1; end end endcase end end endmodule
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