如下图,例化iddr/oddr时会生成pll,结果PLL不够用了:
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如下图,例化iddr/oddr时会生成pll,结果PLL不够用了:

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问题解决了,谢谢。把DDR配置模式修改下,iddr选择边沿对齐后ddrdll资源不足。改为中间对齐后就可以了。