IDDR2 #(
.DDR_ALIGNMENT("NONE"), // Sets output alignment to "NONE", "C0" or "C1"
.INIT_Q0(1'b0), // Sets initial state of the Q0 output to 1'b0 or 1'b1
.INIT_Q1(1'b0), // Sets initial state of the Q1 output to 1'b0 or 1'b1
.SRTYPE("SYNC") // Specifies "SYNC" or "ASYNC" set/reset
) IDDR2_inst (
.Q0(Q0), // 1-bit output captured with C0 clock
.Q1(Q1), // 1-bit output captured with C1 clock
.C0(C0), // 1-bit clock input
.C1(C1), // 1-bit clock input
.CE(CE), // 1-bit clock enable input
.D(D), // 1-bit DDR data input
.R(R), // 1-bit reset input
.S(S) // 1-bit set input
);
参数的设置及端口的定义参见xilinx相关的手册
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