7系列selectio之IOBUF（五）
5IOBUFDS_DCIEN
如下图是带有DCI和终端电阻的原语，与IOBUF_DCIEN类型，只不过是差分的。
IOBUFDS_DCIEN #(
.DIFF_TERM("FALSE"), // Differential Termination ("TRUE"/"FALSE")
.IBUF_LOW_PWR("TRUE"), // Low Power - "TRUE", High Performance = "FALSE"
.IOSTANDARD("BLVDS_25"), // Specify the I/O standard
.SLEW("SLOW"), // Specify the output slew rate
.USE_IBUFDISABLE("TRUE") // Use IBUFDISABLE function, "TRUE" or "FALSE"
) IOBUFDS_DCIEN_inst (
.O(O), // Buffer output
.IO(IO), // Diff_p inout (connect directly to top-level port)
.IOB(IOB), // Diff_n inout (connect directly to top-level port)
.DCITERMDISABLE(DCITERMDISABLE), // DCI Termination enable input
.I(I), // Buffer input
.IBUFDISABLE(IBUFDISABLE), // Input disable input, high=disable
.T(T) // 3-state enable input, high=input, low=output
);6IOBUFDS_DIFF_OUT
差分的输入输出原语。
IOBUFDS_DIFF_OUT #(
.DIFF_TERM("FALSE"), // Differential Termination ("TRUE"/"FALSE")
.IBUF_LOW_PWR("TRUE"), // Low Power - "TRUE", High Performance = "FALSE"
.IOSTANDARD("BLVDS_25") // Specify the I/O standard
) IOBUFDS_DIFF_OUT_inst (
.O(O), // Buffer p-side output
.OB(OB), // Buffer n-side output
.IO(IO), // Diff_p inout (connect directly to top-level port)
.IOB(IOB), // Diff_n inout (connect directly to top-level port)
.I(I), // Buffer input
.TM(TM), // 3-state enable input, high=input, low=output
.TS(TS) // 3-state enable input, high=input, low=output
);7IOBUFDS_DIFF_OUT_DCIEN
只可以用于HP BANK的差分输入与输出原语，IBUFDISABLE原语能够屏蔽输入，DCITERMDISABLE信号能够屏蔽DCI的使用，
当将USE_IBUFDISABLE属性设置为TRUE并且IBUFDISABLE信号被设置为高电平时，可以禁用输入缓冲器。同时，该原语会强制将输出O和OB引脚设置为逻辑高电平
当USE_IBUFDISABLE为FALSE时，需要将该输入信号连接到地。而对于使用了分割终端DCI特性的I/O，当DCITERMDISABLE信号设置为高电平时，终端电阻将被禁用，不会对输入信号进行终端阻抗匹配。
TS为低电平时IO输出为低电平，TM为低电平时IOB输出为低电平。
IOBUFDS_DIFF_OUT_DCIEN #(
.DIFF_TERM("FALSE"), // Differential Termination ("TRUE"/"FALSE")
.IBUF_LOW_PWR("TRUE"), // Low Power - "TRUE", High Performance = "FALSE"
.IOSTANDARD("BLVDS_25"), // Specify the I/O standard
.USE_IBUFDISABLE("TRUE") // Use IBUFDISABLE function, "TRUE" or "FALSE"
) IOBUFDS_DIFF_OUT_DCIEN_inst (
.O(O), // Buffer p-side output
.OB(OB), // Buffer n-side output
.IO(IO), // Diff_p inout (connect directly to top-level port)
.IOB(IOB), // Diff_n inout (connect directly to top-level port)
.DCITERMDISABLE(DCITERMDISABLE), // DCI Termination enable input
.I(I), // Buffer input
.IBUFDISABLE(IBUFDISABLE), // Input disable input, high=disable
.TM(TM), // 3-state enable input, high=input, low=output
.TS(TS) // 3-state enable input, high=input, low=output
);8IOBUFDS_DIFF_OUT_INTERMDISABLE
与IOBUFDS_DIFF_OUT_DCIEN 类似，只不过DCI换成了终端匹配，进而可以用于HR HP BANK。
IOBUFDS_DIFF_OUT_INTERMDISABLE #(
.DIFF_TERM("FALSE"), // Differential Termination, "TRUE"/"FALSE"
.IBUF_LOW_PWR("TRUE"), // Low power="TRUE", Highest performance="FALSE"
.IOSTANDARD("DEFAULT"), // Specify the input I/O standard
.USE_IBUFDISABLE("TRUE") // Set to "TRUE" to enable IBUFDISABLE feature
) IOBUFDS_DIFF_OUT_INTERMDISABLE_inst (
.O(O), // Buffer p-side output
.OB(OB), // Buffer n-side output
.IO(IO), // Diff_p inout (connect directly to top-level port)
.IOB(IOB), // Diff_n inout (connect directly to top-level port)
.I(I), // Buffer input
.INTERMDISABLE(INTERMDISABLE), // Input termination disable input
.IBUFDISABLE(IBUFDISABLE), // Input disable input, high=disable
.TM(TM), // 3-state enable input, high=input, low=output
.TS(TS) // 3-state enable input, high=input, low=output
);9IOBUFDS_INTERMDISABLE
与IOBUF_INTERMDISABLE类型，只不过这个时差分形式的。
IOBUFDS_INTERMDISABLE #(
.DIFF_TERM("FALSE"), // Differential Termination ("TRUE"/"FALSE")
.IBUF_LOW_PWR("TRUE"), // Low Power - "TRUE", High Performance = "FALSE"
.IOSTANDARD("BLVDS_25"), // Specify the I/O standard
.SLEW("SLOW"), // Specify the output slew rate
.USE_IBUFDISABLE("TRUE") // Use IBUFDISABLE function, "TRUE" or "FALSE"
) IOBUFDS_INTERMDISABLE_inst (
.O(O), // Buffer output
.IO(IO), // Diff_p inout (connect directly to top-level port)
.IOB(IOB), // Diff_n inout (connect directly to top-level port)
.I(I), // Buffer input
.IBUFDISABLE(IBUFDISABLE), // Input disable input, high=disable
.INTERMDISABLE(INTERMDISABLE), // Input termination disable input
.T(T) // 3-state enable input, high=input, low=output
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