Vivado报错 [Place 30-99] Placer failed with error: ‘IO Clock Placer failed‘-Toy模板网

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项目场景：

Vivado版本： 2018.3
FPGA开发板：XC7VX690T-2FFG1157I
背景：使用差分时钟检测基本电路观察闪灯效果
报错如下
[Place 30-99] Placer failed with error: ‘IO Clock Placer failed’ Please review all ERROR, CRITICAL WARNING, and WARNING messages during placement to understand the cause for failure.

问题描述

1.先分配完差分对IP核
Vivado报错 [Place 30-99] Placer failed with error: ‘IO Clock Placer failed‘

Vivado报错 [Place 30-99] Placer failed with error: ‘IO Clock Placer failed‘

2.在程序里面实例化IP核

clk_wiz_0 clk32M_inst
 (// Clock in ports
  // Clock out ports
  .clk_out1(my_clk),
  // Status and control signals
  .locked(clk32Mpll_lock),
  .clk_in1_p(clk32M_p),
  .clk_in1_n(clk32M_n)
 );

3.分配引脚
点击Ctrl+S保存。 Vivado报错 [Place 30-99] Placer failed with error: ‘IO Clock Placer failed‘
4.生成bit文件
此时提示有错误。[Place 30-99] Placer failed with error: ‘IO Clock Placer failed’ Please review all ERROR, CRITICAL WARNING, and WARNING messages during placement to understand the cause for failure. Vivado报错 [Place 30-99] Placer failed with error: ‘IO Clock Placer failed‘