用Verilog写一个i2c2mdio模块
以下是一个使用Verilog编写的i2c2mdio模块的示例代码：
module i2c2mdio (
input wire clk,
input wire reset,
input wire i2c_scl,
inout wire i2c_sda,
output wire mdio_mdc,
inout wire mdio_mdio,
output wire mdio_resetn,
output wire mdio_phyadd,
output wire mdio_regadd,
output wire mdio_wr,
output wire mdio_rd,
inout wire mdio_data
);
// I2C State Machine
reg [2:0] i2c_state;
reg i2c_start;
reg i2c_stop;
reg [7:0] i2c_data;
reg [2:0] i2c_count;
// MDIO State Machine
reg [2:0] mdio_state;
reg mdio_start;
reg mdio_stop;
reg [7:0] mdio_data;
reg [2:0] mdio_count;
// I2C to MDIO Mapping
reg [2:0] i2c2mdio_state;
reg [7:0] i2c2mdio_data;
reg [2:0] i2c2mdio_count;
// MDIO to I2C Mapping
reg [2:0] mdio2i2c_state;
reg [7:0] mdio2i2c_data;
reg [2:0] mdio2i2c_count;
// I2C2MDIO Module
i2c2mdio_module i2c2mdio_inst (
.clk(clk),
.reset(reset),
.i2c_scl(i2c_scl),
.i2c_sda(i2c_sda),
.mdio_mdc(mdio_mdc),
.mdio_mdio(mdio_mdio),
.mdio_resetn(mdio_resetn),
.mdio_phyadd(mdio_phyadd),
.mdio_regadd(mdio_regadd),
.mdio_wr(mdio_wr),
.mdio_rd(mdio_rd),
.mdio_data(mdio_data),
.i2c2mdio_state(i2c2mdio_state),
.i2c2mdio_data(i2c2mdio_data),
.i2c2mdio_count(i2c2mdio_count),
.mdio2i2c_state(mdio2i2c_state),
.mdio2i2c_data(mdio2i2c_data),
.mdio2i2c_count(mdio2i2c_count)
);
// I2C State Machine
always @(posedge clk or posedge reset) begin
if (reset) begin
i2c_state <= 3'b000;
i2c_start <= 1'b0;
i2c_stop <= 1'b0;
i2c_data <= 8'b0;
i2c_count <= 3'b0;
end else begin
case (i2c_state)
3'b000: begin
if (i2c_start) begin
i2c_state <= 3'b001;
i2c_data <= 8'b0;
i2c_count <= 3'b0;
end
end
3'b001: begin
i2c_state <= 3'b010;
i2c_data <= i2c_data << 1;
i2c_data[0] <= i2c_sda;
i2c_count <= i2c_count + 1;
end
3'b010: begin
if (i2c_count < 7) begin
i2c_state <= 3'b001;
i2c_data <= i2c_data << 1;
i2c_data[0] <= i2c_sda;
i2c_count <= i2c_count + 1;
end else begin
i2c_state <= 3'b011;
end
end
3'b011: begin
i2c_state <= 3'b100;
i2c_data <= 8'b0;
i2c_count <= 3'b0;
end
3'b100: begin
i2c_state <= 3'b101;
i2c_data <= i2c_data << 1;
i2c_data[0] <= i2c_sda;
i2c_count <= i2c_count + 1;
end
3'b101: begin
if (i2c_count < 7) begin
i2c_state <= 3'b100;
i2c_data <= i2c_data << 1;
i2c_data[0] <= i2c_sda;
i2c_count <= i2c_count + 1;
end else begin
i2c_state <= 3'b110;
end
end
3'b110: begin
i2c_state <= 3'b111;
i2c_data <= i2c_data << 1;
i2c_data[0] <= i2c_sda;
i2c_count <= i2c_count + 1;
end
3'b111: begin
if (i2c_count < 7) begin
i2c_state <= 3'b110;
i2c_data <= i2c_data << 1;
i2c_data[0] <= i2c_sda;
i2c_count <= i2c_count + 1;
end else begin
i2c_state <= 3'b000;
i2c_stop <= 1'b1;
end
end
endcase
end
end
// MDIO State Machine
always @(posedge clk or posedge reset) begin
if (reset) begin
mdio_state <= 3'b000;
mdio_start <= 1'b0;
mdio_stop <= 1'b0;
mdio_data <= 8'b0;
mdio_count <= 3'b0;
end else begin
case (mdio_state)
3'b000: begin
if (mdio_start) begin
mdio_state <= 3'b001;
mdio_data <= 8'b0;
mdio_count <= 3'b0;
end
end
3'b001: begin
mdio_state <= 3'b010;
mdio_data <= mdio_data << 1;
mdio_data[0] <= mdio_mdio;
mdio_count <= mdio_count + 1;
end
3'b010: begin
if (mdio_count < 7) begin
mdio_state <= 3'b001;
mdio_data <= mdio_data << 1;
mdio_data[0] <= mdio_mdio;
mdio_count <= mdio_count + 1;
end else begin
mdio_state <= 3'b011;
end
end
3'b011: begin
mdio_state <= 3'b100;
mdio_data <= 8'b0;
mdio_count <= 3'b0;
end
3'b100: begin
mdio_state <= 3'b101;
mdio_data <= mdio_data << 1;
mdio_data[0] <= mdio_mdio;
mdio_count <= mdio_count + 1;
end
3'b101: begin
if (mdio_count < 7) begin
mdio_state <= 3'b100;
mdio_data <= mdio_data << 1;
mdio_data[0] <= mdio_mdio;
mdio_count <= mdio_count + 1;
end else begin
mdio_state <= 3'b110;
end
end
3'b110: begin
mdio_state <= 3'b111;
mdio_data <= mdio_data << 1;
mdio_data[0] <= mdio_mdio;
mdio_count <= mdio_count + 1;
end
3'b111: begin
if (mdio_count < 7) begin
mdio_state <= 3'b110;
mdio_data <= mdio_data << 1;
mdio_data[0] <= mdio_mdio;
mdio_count <= mdio_count + 1;
end else begin
mdio_state <= 3'b000;
mdio_stop <= 1'b1;
end
end
endcase
end
end
// I2C to MDIO Mapping
always @(posedge clk or posedge reset) begin
if (reset) begin
i2c2mdio_state <= 3'b000;
i2c2mdio_data <= 8'b0;
i2c2mdio_count <= 3'b0;
end else begin
case (i2c2mdio_state)
3'b000: begin
if (i2c_stop) begin
i2c2mdio_state <= 3'b001;
i2c2mdio_data <= 8'b0;
i2c2mdio_count <= 3'b0;
end
end
3'b001: begin
i2c2mdio_state <= 3'b010;
i2c2mdio_data <= i2c_data;
i2c2mdio_count <= i2c_count;
end
3'b010: begin
i2c2mdio_state <= 3'b011;
end
3'b011: begin
i2c2mdio_state <= 3'b100;
mdio_start <= 1'b1;
end
3'b100: begin
if (mdio_state == 3'b000) begin
i2c2mdio_state <= 3'b101;
i2c2mdio_data <= mdio_data;
i2c2mdio_count <= mdio_count;
end
end
3'b101: begin
i2c2mdio_state <= 3'b110;
end
3'b110: begin
i2c2mdio_state <= 3'b111;
mdio_stop <= 1'b1;
end
3'b111: begin
if (mdio_state == 3'b000) begin
i2c2mdio_state <= 3'b000;
i2c_start <= 1'b1;
end
end
endcase
end
end
// MDIO to I2C Mapping
always @(posedge clk or posedge reset) begin
if (reset) begin
mdio2i2c_state <= 3'b000;
mdio2i2c_data <= 8'b0;
mdio2i2c_count <= 3'b0;
end else begin
case (mdio2i2c_state)
3'b000: begin
if (mdio_stop) begin
mdio2i2c_state <= 3'b001;
mdio2i2c_data <= 8'b0;
mdio2i2c_count <= 3'b0;
end
end
3'b001: begin
mdio2i2c_state <= 3'b010;
mdio2i2c_data <= mdio_data;
mdio2i2c_count <= mdio_count;
end
3'b010: begin
mdio2i2c_state <= 3'b011;
end
3'b011: begin
mdio2i2c_state <= 3'b100;
i2c_start <= 1'b1;
end
3'b100: begin
if (i2c_state == 3'b000) begin
mdio2i2c_state <= 3'b101;
mdio2i2c_data <= i2c_data;
mdio2i2c_count <= i2c_count;
end
end
3'b101: begin
mdio2i2c_state <= 3'b110;
end
3'b110: begin
mdio2i2c_state <= 3'b111;
i2c_stop <= 1'b1;
end
3'b111: begin
if (i2c_state == 3'b000) begin
mdio2i2c_state <= 3'b000;
mdio_start <= 1'b1;
end
end
endcase
end
end
endmodule
请注意，此代码仅提供了一个基本的i2c2mdio模块的框架，具体的功能和实现细节可能需要根据具体的需求进行调整和完善。
原文地址: https://www.cveoy.top/t/topic/hWRM 著作权归作者所有。请勿转载和采集!