obufds_i+o+pin+is+not++top+level
时间: 2023-12-16 07:06:20 浏览: 29
根据提供的引用内容,可以看出这是关于FPGA设计中的差分信号的定义。其中,引用和引用分别定义了差分信号的正负极性输出。而针对问题“obufds_i+o+pin+is+not++top+level?”,可以猜测这是在询问差分信号的输入引脚是否在顶层模块中。
回答:根据提供的信息,无法确定obufds_i+o+pin是否在顶层模块中。因为差分信号的输入引脚可能在顶层模块中,也可能在子模块中。如果想要确定差分信号的输入引脚是否在顶层模块中,需要查看FPGA设计的具体代码。
相关问题
OBUFDS_inst O pin is not connected to a top-level port.
The error message you are seeing indicates that the output pin "O" of an OBUFDS (Differential Output Buffer) instance in your design is not connected to a top-level port.
To fix this error, you need to make sure that the output pin "O" is connected to a top-level port in your design. You can do this by either adding a new top-level port and connecting it to the output pin "O", or by connecting the output pin "O" to an existing top-level port.
Here is an example of how to connect an OBUFDS output pin to a top-level port in Verilog:
```
module my_design (
// Top-level ports
input clk,
input rst,
output diff_out_p,
output diff_out_n
);
// Instantiate OBUFDS instance
OBUFDS_inst my_bufds (
.I(my_input_signal),
.O(diff_out_p),
.OB(diff_out_n)
);
// Other logic in the module
endmodule
```
In this example, the output pins "O" and "OB" of the OBUFDS instance are connected to the top-level ports "diff_out_p" and "diff_out_n", respectively. Make sure to replace "my_input_signal" with the signal you want to buffer.
generated+clock+rgmii_clk+with+source+pin+clk_out+dose+not+have+a+valid+master+clock+or+valid+wavefo
generated+clock+rgmii_clk+with+source++clk_out+dose+not+have+a+valid+master+clock+or+valid+wavefo 是一个错误信息,意思是生成的时钟 rgmii_clk 的源引脚 clk_out 没有有效的主时钟或有效的波形。这个错误通常发生在时钟生成电路中,可能是由于时钟源引脚没有正确连接或者时钟源信号不稳定导致的。要解决这个问题,你可以检查时钟源引脚的连接是否正确,确保主时钟或波形是有效的,并且时钟信号稳定。如果问题仍然存在,可能需要进一步检查时钟生成电路的设计和配置。