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参数比较运算

    localparam QPLL_FBDIV_IN  =  (QPLL_FBDIV_TOP == 16)  ? 10'b0000100000 : (QPLL_FBDIV_TOP == 20)  ? 10'b0000110000 :(QPLL_FBDIV_TOP == 32)  ? 10'b0001100000 :(QPLL_FBDIV_TOP == 40)  ? 10'b0010000000 :(QPLL_FBDIV_TOP == 64)  ? 10'b0011100000 :(QPLL_FBDIV_TOP == 66)  ? 10'b0101000000 :(QPLL_FBDIV_TOP == 80)  ? 10'b0100100000 :(QPLL_FBDIV_TOP == 100) ? 10'b0101110000 : 10'b0000000000;

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参数选择编译

generate  if(C_CLK_IN_TYPE==0)begin: IBUF_U  IBUF    IBUF_u(.I(clk_in_p  ),.O(clk_in_buf));end if(C_CLK_IN_TYPE==1)begin: IBUFDS_U  IBUFDS  IBUFDS_u(.I (clk_in_p  ),.IB(clk_in_n  ),.O (clk_in_buf));end if(C_CLK_IN_TYPE==2)begin: IBUFDS_GTE2_U  IBUFDS_GTE2 IBUFDS_GTE2_u(.I (clk_in_p  ),.ODIV2(    ),.IB(clk_in_n  ),.CEB  (1'b0),.O (clk_in_buf));end 
endgenerate