Hi,I have a basic doubt. In the Nios design, what SDRAM controller do we use? Do we use the simple SDRAM controller or DDR3 SDRAM controller with UNIPHY? What is the difference between the two and how do we decide which to select? Thanks.
The memory controller selection is driven by the components populated on the hardware you are using. If you're using a board with DDR3, you use the DDR3 IP. If you're using a board with traditional single data rate SDRAM, use the SDRAM controller.
Look at this Lab Manual for the BeMicro kit: http://www.alterawiki.com/uploads/5/5e/bemicrom10_embedded_system_lab.pdfIn section 5.3.6 they show what connections are to be made for the SDRAM controller. Good Luck!
Are you using a development board? They generally have a "golden top" reference design that gives you a sample pinout with most interfaces connected. The interfaces are quite flexible so you can pinout identical to the development kit, or if you have your own board, just use this as guidance.
--- Quote Start --- I see. So my board has a DDR3, so thats that. Also, Where can I find how to make the pin-connections required for the sdram controller? --- Quote End --- I wrote a couple of example designs; one for SDRAM on the DE0-nano board and one for DDR3 on the BeMicro-CV board. Synthesize the designs and read the scripts and notes. They have all the information you are looking for. Look at de0_nano_sdram.zip: http://www.alteraforum.com/forum/showthread.php?t=45927 Look at bemicro_cv_examples.zip: http://www.alteraforum.com/forum/showthread.php?t=43992 Cheers, Dave