what does this code do "iloop = (mode inside {0,4}) ? cs_tIS_sweep.size() : 1;
        if(external_cstm_entry_exit == 0) begin
            // Entering...
            execute_mpc(.opcode(ENTER_CS_OPCODE));
        end
        des_addr(.ca($urandom()));
        if (mode inside {0,4})
            des(.num(current_timing.tCSTM_Entry.clks_floor-$urandom_range(4)));
        else
            des(.num(current_timing.tCSTM_Entry.clks_floor-1));
        set_auto_nop_enable(0);
        if (mode == 4 || rand_cstm_nummatch <= 2)
            mode_0_4_comp_threshold = 0;
        else if (rand_cstm_nummatch == 3)
            mode_0_4_comp_threshold = 1;
        else if (rand_cstm_nummatch == 4)
            mode_0_4_comp_threshold = 3;
        else
            mode_0_4_comp_threshold = rand_cstm_nummatch;
        for (int x=0; x<iloop; x++) begin
            if (mode inside {0,4}) begin
                longint ts = cs_tIS_sweep.pop_front();
                current_timing.tIS_cs.set_time_in_ps(.ps(ts));
                current_timing.tIS.set_time_in_ps(.ps(ts));
            end
            // Training
            for (int idx = 0; idx < cs_patterns.size(); idx++) begin
                logic [3:0] one_cs;
                addr_bits_lv_t des_ca, nop_ca;
                one_cs = cs_patterns.pop_front();
                for (int pos = 0; pos < $bits(one_cs); pos++) begin
                    des_ca = get_random_ca_pins();
                    nop_ca = get_random_ca_pins() | arch_defines_pkg::NOP_CMD_BITS;
                    if (mode i Respond with at most 900 words.
user