fast adc connect to cyclone ii

I have a 250M sample rate ADC ( AD9481 , two 8 bit output channels) connect to cyclone II EP2C8Q208C8 , two of their pins ( DCO+ and DCO-, their clock is 60M) are differential output are connect to differential inputs of EP2C8Q208C8 . When dco+ is raising edge channel 1 data is valid while dco- is raising edge channel 2 data is valid. Under the code below :

module mux3(dco+,dco-,data1,data2,data3);

input dco+,dco-;

input [7:0] data1;

input [7:0] data2;

output [7:0] data3;

reg [7:0] data3;

reg sela;

reg selb;

reg [7:0] data_a;

reg [7:0] data_b;

initial begin

sela = 1'b0;

selb = 1'b0;

end

always @ (posedge dco+) begin

sela <= ~ selb; // warning, must meet setup/hold

data_a <= data1;

end

always @ (posedge dco-) begin

selb <= sela; // warning, must meet setup/hold

data_b <= data2;

end

always @ (sela, selb, data_a, data_b) begin

if (sela^selb) begin

data3 = data_a; // warning, combinatorial output.

end else begin

data3 = data_b; // warning, combinatorial output.

end

end

endmodule

The question I ask is can the code above function properly as two channels are multiplex and only one channel is selected as output ????