新手求助模块连接不上

只看该作者 · 2012-9-24 16:00

如下是我的顶层模块，编译不报错。但是有警告WARNING:Xst:1290 - Hierarchical block <DACONTROL1> is unconnected in block <cartpro>. It will be removed from the design.一共用了三个模块，DCM时钟、软复位的reset和 DACONTROL1 ，综合后DACONTROL1这个模块确实被移除了，求教为什么。我有clk和i_rst是相连的啊？
module cartpro(
input in_clk,

inout  sda,
output scl
);

wire
i_rst;
wire clk_ibufg_out;
wire clk;
wire h_speed_clk;
wire clk_locked;

colk colk(.CLKIN_IN(in_clk),
         .RST_IN(i_rst),
         .CLKFX_OUT(h_speed_clk),
         .CLKIN_IBUFG_OUT(clk_ibufg_out),
         .CLK0_OUT(clk),
         .LOCKED_OUT(clk_locked));

reset reset1(

.clk(h_speed_clk),

.rest(i_rst));

wire [7:0]io_vcc;

wire [7:0] ioinh;
      wire [7:0] ioinl;

DACONTROL DACONTROL1(

.clk(clk),

.rst_n(i_rst),

      .iovccdata(io_vcc),
      .ioinh(ioinh),
      .ioinl(ioinl),
      .sda(),
      .scl()
);
endmodule