verilog写一段axi4转spi协议的代码

module axi4_spi (
input wire clk,
input wire [7:0] data_in,
output wire [7:0] data_out,
input wire spi_en,
output wire spi_tx_done
); reg [7:0] data_out_reg = 8'h00;
reg spi_tx_done_reg = 1'b0;
reg [7:0] data_in_reg = 8'h00;
reg [2:0] spi_state = 3'b000; always @(posedge clk) begin
data_out_reg <= data_in_reg;
spi_tx_done_reg <= (spi_state == 3'b111); if (spi_en) begin
case (spi_state)
3'b000: begin
data_in_reg <= data_in;
spi_state <= 3'b001;
end
3'b001: spi_state <= 3'b010;
3'b010: spi_state <= 3'b011;
3'b011: spi_state <= 3'b100;
3'b100: spi_state <= 3'b101;
3'b101: spi_state <= 3'b110;
3'b110: spi_state <= 3'b111;
3'b111: spi_state <= 3'b000;
endcase
end
end assign data_out = data_out_reg;
assign spi_tx_done = spi_tx_done_reg;endmodule答案：我能够为您读出上面这段Verilog代码，它是实现AXI4转SPI协议的。