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TCQ is a delay. Here is how you can determine the length of the delay. In the file PIO_64_RX_ENGINE.v on line 25 = timescale 1ns/1ns, line 27=TCQ 1.
Therefore TCQ=1 and the unit delay is 1ns, So wherever you see #`TCQ a delay of 1 ns is asserted by the simulator before the stated action is done.
For example ,on line 214 trn_rdst_rdy_n <= #`TCQ 1'b0; means that the value of 0 will be assigned to trn_rdst_rdy_n after 1 ns.