How to use SDRAM on de2-70 board?

since I don't have much time.

just quick reply.

1. what kinds of SOPC component do I use?

you can make any type of IP-core, even CPU as well(it's not easy of course)

Master / Slave / Stream sink / Stream source.

2. After using above SOPC builder component, do I have to use Eclipse Software for using SDRAM? or use verilog code to write/read SDRAM.

no, your IP-core is able to access Memory Space directry like NiosII.

also you can share memory between NiosII and your own HDL.

3. If I must use software for SDRAM data inout,

I want to write some data to address of sdram, and read data from

address of sdram using Nios II Eclipse (c or c++).

you can write/read memory in C/C++.( convenient)

you also can write / read memory via your own HDL.(fast)

all right, I'm doing my job now.

and I think this topic is going down and I can't find this again.

you can e-mail to me@akiron.com.

if i have time, I can teach you step by step.