How to use SDRAM on de2-70 board?

first of all.

why not using SOPC?

the reason I guess is to access SDRAM via NiosII is too slow.

you wanna access SDRAM as fast as it can.

is that right?

you can use SOPC builder and Avalon-MM "Master".

you can use bast transfer via Avalon bus.

this is easy way and safety way.

otherwise, you need to write long long code in HDL.

like this.

ttp://cache.micron.com/protected/expiretime=1282712493;badurl=ahr0cdovl3d3dy5tawnyb24uy29tly80mdquahrtba==/fe03e95c6f6a764e10b3fbfff5a207f7/1/32/512mb_sdr.pdf

reading and writing process is not difficult.

but you need to write initial process and precharge process as well.

I have done this before( for SDRAM / DDRSDRAM)

it took months.( I was newbie too)

now, I was studied I did not need to write this.

SOPC is handy enough.

if you still wanna try it, the hell is waiting for you.

good luck.

--- Quote Start ---

first of all.

why not using SOPC?

the reason I guess is to access SDRAM via NiosII is too slow.

you wanna access SDRAM as fast as it can.

is that right?

you can use SOPC builder and Avalon-MM "Master".

you can use bast transfer via Avalon bus.

this is easy way and safety way.

otherwise, you need to write long long code in HDL.

like this.

ttp://cache.micron.com/protected/expiretime=1282712493;badurl=ahr0cdovl3d3dy5tawnyb24uy29tly80mdquahrtba==/fe03e95c6f6a764e10b3fbfff5a207f7/1/32/512mb_sdr.pdf

reading and writing process is not difficult.

but you need to write initial process and precharge process as well.

I have done this before( for SDRAM / DDRSDRAM)

it took months.( I was newbie too)

now, I was studied I did not need to write this.

SOPC is handy enough.

if you still wanna try it, the hell is waiting for you.

good luck.

--- Quote End ---

Thanks for your apply.

after of all, I need to use SOPC buillder..

"you can use SOPC builder and Avalon-MM "Master".

you can use bast transfer via Avalon bus."

I don't understand above sentence...

1. what kinds of sopc component do i use?

NIOS II/e cpu, sdram controller, jtag uart, and avalon MM??

I don't know about avalon ...

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.

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++).

(ex. address : 0x0002000, data : 11111111

0x0002001, data : 11111110 ...)

how can i write/read data to/from address using c or c++.

I try to find some SDRAM examples, there are not about real/write data, but about only LED, Switch..

How can I get some instruction or code about using SDRAM data/address?

Thanks for your kindness.

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.

you don't have to email to me.

I got e-mails from this forum.

(I didn't know that:rolleyes:)

all right see you later.

all, right.

I have some questions for you.

Q1. do you know custom IP?

which means the IP-core which you make.

Q2. can you access your SDRAM

can you access your SDRAM some how?

which means your system is connected to the SDRAM already.

Q3. Do you know HDL?

have you ever coded HDL and access to your hardware.

OK, I wait your answer.

and then I "may" teach you how SOPC builder works.

unfortunately, I can not reply for 12 hours at least.

see you.

--- Quote Start ---

all, right.

I have some questions for you.

Q1. do you know custom IP?

which means the IP-core which you make.

Q2. can you access your SDRAM

can you access your SDRAM some how?

which means your system is connected to the SDRAM already.

Q3. Do you know HDL?

have you ever coded HDL and access to your hardware.

OK, I wait your answer.

and then I "may" teach you how SOPC builder works.

unfortunately, I can not reply for 12 hours at least.

see you.

--- Quote End ---

1. I can make simple sopc system using NIOS II/e cpu, led, switch in DE2-70

example, but I don't know how they connected and how they operate.

(like Avalon MM, I don't know about that)

I can understand and follow this example.

ftp://ftp.altera.com/up/pub/altera_material/qii_9.0/computer_organization/de2-70/tutorials/verilog/tut_de2-70_sdram_verilog.pdf

I can just add some simple sopc components and make top verilog code

for pin input, output & sopc components connection.

2. DE2-70 board has two 32MB SDRAM, but I have never used that before.

3. I know verilog hdl code and I can follow simple SOPC & NIOS II example about DE2-70, but I cannot make verilog code for complicated system.

Thanks for your help!

all right

this is first step for you.

http://www.akiron.com/fpga/customipinstruction.pdf

:)

Dear teddy80,

IIRC, in the MegaWizard, there's a "raw" SDRAM controller core that you can use if you do not wish to use the SOPC and the Avalon interface.

--- Quote Start ---

all right

this is first step for you.

http://www.akiron.com/fpga/customipinstruction.pdf

:)

--- Quote End ---

sorry for my late apply because of other work.

I followed your instruction, and got some questions.

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

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

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

> 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.