将代码从ISE移植到Vivado，利用Vivado综合代码，会消耗十几个小时，LUT使用量远超正常水平。（使用ISE时，LUT的消耗量仅为2707）
1. Slice Logic
+----------------------------+--------+-------+-----------+--------+
| Site Type | Used | Fixed | Available | Util% |
+----------------------------+--------+-------+-----------+--------+
| Slice LUTs* | 196583 | 0 | 53200 | 369.52 |
| LUT as Logic | 196396 | 0 | 53200 | 369.17 |
| LUT as Memory | 187 | 0 | 17400 | 1.07 |
| LUT as Distributed RAM | 2 | 0 | | |
| LUT as Shift Register | 185 | 0 | | |
| Slice Registers | 47400 |
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