FPGA_DDR错误总结

1otp 31-67

解决 端口没连接 必须赋值；

2.PLACE 30-58 TERM PLINITCALIBZ这里有问题 在顶层输出但是没有管脚约束报错

3.ERROR: [Place 30-675]

这是时钟不匹配IBUF不在同一个时钟域，时钟不在同一个时钟域里，推荐的不建议修改

问题

原本的时钟是从fpga端口输出给pll，pll产生的时钟给各个模块。选的是 nobuffer,会报错并且没有进ibuff bufg

解决：

生成两个pll，一个是给所有的模块所用到的时钟，一个是专门给migddr3的时钟。

端口的差分时钟进入IBUFDS，把差分转单端，并且进入一个BUFG，从BUFG出来的时钟作为pll锁相环的输入，同时在配置pll的时候选择global_buffer.

//+FHEADER ===============================================================================
// Copyright(c) Comlighten TECHNOLOGY Co.,LTD. All rights reserved.
// =======================================================================================
// 
// File Name     :  
// Department    : 
// Author        :  
// Author's Email:  
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// =======================================================================================
// PURPOSE:
//
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// =======================================================================================
// RELEASE HISTORY
// VERSION        DATE      AUTHOR         DESCRIPTION
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//-FHEADER ===============================================================================
`timescale 1 ps / 1 ps

module dcm_wrapper(
input   fpga_clk_p,
input   fpga_clk_n,
input   sys_rst   ,
output  clk_240  ,
output  clk_dac  ,
output  clk_720,
output reg  rf_init ,
output  asy_rst

);


wire clk40_s;
wire clk40_g;
wire clk600_lock;
wire  lock;

assign asy_rst = (~lock)&(~clk600_lock);

//clk_wiz_1 clk_wiz_1 (
//.clk_in1_p( fpga_clk_p ),
//.clk_in1_n( fpga_clk_n ),
//.clk_out1 ( clk_dac    ),
//.clk_out2 ( clk_240    ),
//.clk_out3 ( clk_720    ),
//.reset    ( sys_rst    ),
//.locked   ( lock       )
// );
//
//reg [31: 0] power_up_dly;
//
//always @( posedge clk_240 or posedge asy_rst ) begin
//    if( asy_rst == 1'b1 )
//        power_up_dly <= 32'd0;
//    else if( power_up_dly == 32'd80000000 )
//        power_up_dly <= power_up_dly;
//    else
//        power_up_dly <= power_up_dly + 32'd1;
//end
//
//
//
//always @( posedge clk_240 or posedge asy_rst ) begin
//    if( asy_rst == 1'b1 )
//        rf_init <= 1'b1;
//    else if( power_up_dly == 32'd80000000 )
//        rf_init <= 1'b0;
//    else;
//end



IBUFDS #(
.DIFF_TERM("FALSE"),       // Differential Termination
.IBUF_LOW_PWR("TRUE"),     // Low power="TRUE", Highest performance="FALSE" 
.IOSTANDARD("DEFAULT")     // Specify the input I/O standard
) IBUFDS_inst (
.O(clk40_s),  // Buffer output
.I(fpga_clk_p),  // Diff_p buffer input (connect directly to top-level port)
.IB(fpga_clk_n) // Diff_n buffer input (connect directly to top-level port)
   );

   BUFG BUFG_inst (
      .O(clk40_g), // 1-bit output: Clock output
      .I(clk40_s)  // 1-bit input: Clock input
   );



clk_wiz_1 clk_wiz_1 (
.clk_in1  ( clk40_g    ),
.clk_out1 ( clk_dac    ),
.clk_out2 ( clk_240    ),
//.clk_out3 ( clk_720    ),
.reset    ( sys_rst    ),
.locked   ( lock       )
 );
 
 
 
  clk_wiz_600 instance_name
   (
    // Clock out ports
    .clk_out1(clk_720),     // output clk_out1
    // Status and control signals
    .reset(sys_rst), // input reset
    .locked(clk600_lock),       // output locked
   // Clock in ports
    .clk_in1(clk40_g));      //

reg [31: 0] power_up_dly;

always @( posedge clk_240 or posedge asy_rst ) begin
    if( asy_rst == 1'b1 )
        power_up_dly <= 32'd0;
    else if( power_up_dly == 32'd80000000 )
        power_up_dly <= power_up_dly;
    else
        power_up_dly <= power_up_dly + 32'd1;
end



always @( posedge clk_240 or posedge asy_rst ) begin
    if( asy_rst == 1'b1 )
        rf_init <= 1'b1;
    else if( power_up_dly == 32'd80000000 )
        rf_init <= 1'b0;
    else;
end




endmodule

选择global