How to use SDRAM on de2-70 board?

> 1. before I follow the chapter 5, do i have to fpga pin assignment & sof download?

yes you do.

but I think you already have assigned project with the development board.

if you have one, you don't have to assign the pins.

but yes,you need sof download.

> 2. in chapter 5, I don't understand customAddress variable.

> I can't find customAddress variable in verilog hdl source.

the customAddress means "base address" in SOPC builder.( see figure 14)

so you simply replace "0x00000000" into the address you got in SOPC builder.

all right, I will prepare next stage in next morning (morning for me).

see you.