how can I use sdram

[Altera_Forum]

hello,everybody: 

I want to use off chip sdram as a data menmory.  First I store some data in sdram.  Second I want process these data in nios II processor using c language.  But how can I read these data from sdram in nios II IDE platform.  Shall I use IORD or using arry pointer.  Thank you !!

[Altera_Forum]

--- Quote Start ---   Shall I use IORD or using arry pointer.  --- Quote End ---   Look at nios ii software developer’s handbook (http://www.altera.com/literature/hb/nios2/n2sw_nii5v2.pdf?gsa_pos=2&wt.oss_r=1&wt.oss=nios%20ii%20software%20developer%e2%80%99s) part "Advanced Placement Options" it will like:  int iData __attribute__ ((section (".sdram_0.text")));

[Altera_Forum]

--- Quote Start ---  hello,everybody: I want to use off chip sdram as a data menmory. First I store some data in sdram. Second I want process these data in nios II processor using c language. But how can I read these data from sdram in nios II IDE platform. Shall I use IORD or using arry pointer. Thank you !!  --- Quote End ---         Thank you! I know his.But how can I use shese data in NIOS　II IDE.SUCh as  I store 1,2,3,4,...5000 in SDRAM in advance.Then in NIOS II IDE,I want to read these data,so I can process these data by c language.How can I read? Shall there have a function or outher methods.

[Altera_Forum]

you should read the application note an517, that you can download from http://www.altera.com/literature/an/an517.pdf 

 with IORD and IOWR you should be able to write and read to/from the SDRAM... here you have a simple code as example.  void readFromSDRAM(int offset){ unsigned int DDR_read_OFFSET_ADDRESS = offset; unsigned int read_data; if ((DDR_read_OFFSET_ADDRESS<0) || (DDR_read_OFFSET_ADDRESS>=(ALTMEMDDR_SPAN/4))){ printf("error"); }else{ read_data=IORD(ALTMEMDDR_BASE,DDR_read_OFFSET_ADDRESS); printf("Read %08x from address %08x \n",read_data,(ALTMEMDDR_BASE+DDR_read_OFFSET_ADDRESS)); } } void writeToSDRAM(int data, int offset){ unsigned int DDR_write_OFFSET_ADDRESS = offset; if((DDR_write_OFFSET_ADDRESS<0)||(DDR_write_OFFSET_ADDRESS>=(ALTMEMDDR_SPAN/4))){ printf("error"); return; } IOWR(ALTMEMDDR_BASE,DDR_write_OFFSET_ADDRESS,data); if (IORD(ALTMEMDDR_BASE,DDR_write_OFFSET_ADDRESS)==data){ printf("Data: %08x is correctly written to memory offset: %08x \n",data,DDR_write_OFFSET_ADDRESS); }else{ printf("error"); } }

[Altera_Forum]

I need help regarding the first phase you did which is writing into the SDRAM using Verilog.

[Altera_Forum]

--- Quote Start ---  I need help regarding the first phase you did which is writing into the SDRAM using Verilog.  --- Quote End ---    It`s one of the way to use sdram: 1. great in SOPC system with 1. sdram controller core (http://www.altera.com/literature/hb/nios2/n2cpu_nii5v3.pdf) and avalon master (look at AVM.ZIP) 2. connect your master in verilog ( with avalon (http://www.altera.com/literature/manual/mnl_avalon_spec.pdf?gsa_pos=1&wt.oss_r=1&wt.oss=mnl_avalon_spec)) to made system   about avalon (http://www.altera.com/products/software/quartus-ii/subscription-edition/design-entry-synthesis/qts-des-ent-syn.html#sopc)

[Altera_Forum]

Thanks for your quick reply. 

 I want to make sure that this solution you provided is pure Verilog (There is no NIOSII). Because I saw a SOPC builder.   I only need a Verilog module that is able to write into the SDRAM without NIOS.  Please, if you can illustrate it a little bit for me, it will be very helpful for me. Thanks

[Altera_Forum]

You can use SOPC builder without the Nios CPU

[Altera_Forum]

--- Quote Start ---   I want to make sure that this solution you provided is pure Verilog (There is no NIOSII). Because I saw a SOPC builder.    --- Quote End ---   Do you wish to write owner sdram controller (in verilog)?    --- Quote Start ---   I only need a Verilog module that is able to write into the SDRAM without NIOS.   --- Quote End ---   NIOS is only part of SOPC facilities. I would recommended to read quartus. embedded peripherals (http://www.altera.com/literature/hb/nios2/n2cpu_nii5v3.pdf)    --- Quote Start ---   Please, if you can illustrate it a little bit for me, it will be very helpful for me.  --- Quote End ---   Look at attachment. It`s only piece of my project (verilog), summary: 1. exten device (camera. without file) -> fifo -> controller_sops (without verilog) -> sopc_sdram_0 -> sdram 2. sdram -> sopc_sdram_0 -> controller_sops (without file) -> uart note: in sopc_sdram_0 there are 2 no coupled part (1-write sdram, 2 - read sdram)  of course, it`s only part exampl, but i think it would help you.

[Altera_Forum]

I have now the example of DE2_CCD. I am trying to extract the SDRAM part from it. 

Yes, it has SOPC without NIOS. I got it now.

[Altera_Forum]

--- Quote Start ---  I have now the example of DE2_CCD. I am trying to extract the SDRAM part from it. Yes, it has SOPC without NIOS. I got it now.  --- Quote End ---   There ir a many examples for de2 (http://www.terasic.com.tw/cgi-bin/page/archive.pl?language=english&categoryno=39&no=)