BSP design and question about EMIF IP

Hi, I am new to design FPGA.

I have a PAC board with it's BSP.

However, I still want to customize my own BSP.

I follow the tutorial about how to make customized BSP.

Here is my step:
Have a copied of a10_ref BSP.
Modified device.tcl device to 10AX115N3F40E2SG. (refer to PAC device.tcl)
In board.qsys, acl_ddr4_a10.qsys, acl_ddr4_a10_core.qsys, Sync All System Infos -> Generate HDL -> Finish
Modified pin assignment. (refer to PAC pin assignment, like PCIE, memory, refclk ...)
In acl_ddr4_a10_core.qsys 
          ddr4a EMIF IP
                   General
                             set memory clock frequency to 1066. ( I set to this because my board memory is DDR4 2133, and a10_ref use DDR4 2400)
                             use recommanded PLL reference clock frequency
                   Mem Timing
                             set Speed bin to -2133
          Sync All System Infos -> Generate HDL -> Finish
In board.qsys
          kernel_clk_gen
                   set REF_CLK_RATE to 100
          config_clk
                   set Explicit clock rate to 100000000
          Sync All System Infos -> Generate HDL -> Finish
In top.v
          reg config_clk; // because in a10_ref, it need 50MHz config_clk, and I only have 100MHz kernel_pll_refclk
          always@(posedge kernel_pll_refclk or negedge perstl0_n) begin
            if (!perstl0_n)
              config_clk <= 0;
            else
              config_clk <= ~config_clk;
          end

However, the system will crash when I try to send data to external memory DDR4. I have upload the log file.

It would be very helpful, if someone can tell me what's wrong.

and I also have some question about EMIF IP.

what should I set in General memory clock frequency?

what should I set in General PLL reference clock frequency?

what is Speed bin in Mem Timing?

I know I have to assign a pin to pll_ref_clk, is this pin clock should match PLL reference clock frequency?

and in a10_ref emif ip, it set memory clock frequency to 1200, and PLL reference clock frequency to 300MHz,

I am not sure what clock it provide to pll_ref_clk, but in top.sdc file I see an assignment "create_clock -period 150MHz [get_ports pll_ref_clk]"

So I guess it assign 150MHz clock when it set PLL reference clock frequency to 300MHz. Why it work?