写一个AHB转APB桥的Verilog代码

我可以回答这个问题。以下是一个简单的AHB转APB桥的Verilog代码：

module AHB_to_APB_bridge (
input HCLK,
input HRESETn,
input [31:0] HADDR,
input [1:0] HSIZE,
input HTRANS,
input HMASTLOCK,
input [31:0] HWDATA,
input [3:0] HSTRB,
input HWRITE,
input HPROT,
output [31:0] PADDR,
output [1:0] PSEL,
output PENABLE,
output PWRITE,
output [31:0] PWDATA,
output [3:0] PSTRB,
output PREADY
);

// APB slave interface signals
reg [31:0] apb_addr;
reg [31:0] apb_data_in;
reg [31:0] apb_data_out;
reg apb_write;
reg [3:0] apb_strb;
reg apb_enable;
reg apb_ready;

// AHB to APB bridge logic
assign PADDR = apb_addr;
assign PSEL = 2'b01; // APB slave select
assign PENABLE = apb_enable;
assign PWRITE = apb_write;
assign PWDATA = apb_data_in;
assign PSTRB = apb_strb;
assign PREADY = apb_ready;

always @(posedge HCLK or negedge HRESETn) begin
if (~HRESETn) begin
apb_addr <= 32'h0;
apb_data_in <= 32'h0;
apb_data_out <= 32'h0;
apb_write <= 1'b0;
apb_strb <= 4'h0;
apb_enable <= 1'b0;
apb_ready <= 1'b0;
end else begin
case ({HTRANS, HSIZE})
2'b00_00: begin // IDLE
apb_enable <= 1'b0;
end
2'b01_10: begin // NONSEQ, 32-bit
apb_addr <= HADDR;
apb_data_in <= HWDATA;
apb_strb <= HSTRB;
apb_write <= HWRITE;
apb_enable <= 1'b1;
end
default: begin // unsupported transfer type
apb_enable <= 1'b0;
end
endcase
end
end

always @(posedge HCLK or negedge HRESETn) begin
if (~HRESETn) begin
apb_ready <= 1'b0;
end else begin
case ({HTRANS, HSIZE})
2'b01_10: begin // NONSEQ, 32-bit
if (apb_enable && !apb_ready) begin
apb_ready <= 1'b1;
end else if (apb_ready && !apb_enable) begin
apb_ready <= 1'b0;
end
end
default: begin // unsupported transfer type
apb_ready <= 1'b0;
end
endcase
end
end

endmodule

希望这可以帮助你！