Question about clock ratio

[zzczzc20]

Dear all,
In the standalone mode, there is a parameter called clock ratio. I want to know whether it uses the clock of memory or memory controller.

For example, if the CPU frequency is 2.8GHz, and I use DDR%-5600. If it is the clock of the memory it should be 1:1. If it is the clock of memory controller, the ratio should be 2:1, let us say the clock frequency of memory controller is 1.4GHz.

[idealgao]

Same question. In SoC design field, these two ratio should be(guess), further testing...

Frontend: clock_ratio: -> sys_clk(cpu/bus_clk) : dfi_clk(ddrc_clk)
MemorySystem: clock_ration -> dfi_clk(ddrc_clk) : DRAM_CK(DDR4_3200=1600MHz)