求教： ISE PLACE报错 ，IBUFDS 问题
时间：10-02
整理：3721RD
点击：
ERROR: [PLACE 30-519] REFCLK pin of IDELAYCTRL instance ‘u_idelayctrl’ is driven by 'refclk_200Mhz_inst' {IBUFDS}.This will lead to unroutable situation,The REFCLK pin of a IDELAYCTRL insatance should be driven by a clock buffer.
可我代码明明用了IBUFGDS的啊：
IDELAYCTRL u_idelayctrl (
.REFCLK (ref_200MHz ),
.RST (！rst_n ),
.RDY ()
);
IBUFGDS #(
.DIFF_TERM ("TRUE"),
.IOSTANDARD ("DEFAULT")
) refclk_200MHz_inst (
.O (ref_200MHz ),
.I (refclk_200MHz_p ), //直接从FPGA管脚输入
.IB (refclk_200MHz_n )
);
先谢谢了！
可我代码明明用了IBUFGDS的啊：
IDELAYCTRL u_idelayctrl (
.REFCLK (ref_200MHz ),
.RST (！rst_n ),
.RDY ()
);
IBUFGDS #(
.DIFF_TERM ("TRUE"),
.IOSTANDARD ("DEFAULT")
) refclk_200MHz_inst (
.O (ref_200MHz ),
.I (refclk_200MHz_p ), //直接从FPGA管脚输入
.IB (refclk_200MHz_n )
);
先谢谢了！
确认一下IODELAY的REFCLK端能否用IBUFGDS来驱动
换句话说就是你这种时钟架构是否合理
供参考