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OBUFDS #(
.IOSTANDARD("DEFAULT"), // Specify the output I/O standard
.SLEW("SLOW") // Specify the output slew rate
) OBUFDS_inst (
.O(CLK4_P), // Diff_p output (connect directly to top-level port)
.OB(CLK4_N), // Diff_n output (connect directly to top-level port)
.I(clk40M) // Buffer input
);
要求是输出一个40M差分输出,但是在约束的时候,出现了问题
[DRC 23-20] Rule violation (BIVC-1) Bank IO standard Vcc - Conflicting Vcc voltages in bank 13. For example, the following two ports in this bank have conflicting VCCOs: CLK4_P (DIFF_SSTL18_I, requiring VCCO=1.800) and SDIO (LVCMOS33, requiring VCCO=3.300)
请问这种电压标准怎么修改
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