Altera_Forum
Honored Contributor
Honored ContributorCan not write or read in SDR SDRAM
Hi,
I am using FPGA Stratix II EP2S60F1020C4. This FPGA board has 2 SDRAM ( Micron MT48LC4M32B2 ) configured as 64-bit bus. These two SDRAM have their control signals connected on the same pins of FPGA except for DQ and DQM. Control signals connected on the same pins are :CLK, CKE, CS, SA, BA, RAS, CAS, WE (eg. CS of 2 SDRAM are connected to pin AL6, SA connected to pin AK4,...). I am trying to write into and read data from SDRAM. I use SDRAM controller core 2000 from Altera. I also write a user program to assert DATA, ADDRESS and COMMANDS to SDRAM controller based on SDRAM controller manual in order to implement SDRAM controller with SDRAM device. My program is written to do these tasks: Initiate SDRAM, Write a 32 bit data into an address, Read data from the same address, and Check data read with 8 LEDs. I have compiled my program with Quartus II 7.0 and got no errors and no timing warnings. However, when this program is applied in FPGA, the data read from SDRAM (given by out put of SDRAM controller) is always FFFF (checked by LEDs),although the data at DQ pin of SDRAM (checked by LEDs) is the same as the data I want to write into SDRAM. It seems that the program can not write data into SDRAM,or can not read. I am not sure, because I do not know any other ways to check. I have tried a lot to figure out why my program does not work properly, but I still can not solve this problem. I am quite new to FPGA as well as SDRAM. My study in university is deal with writing and reading data in SDRAM, therefore; it is very important to me to use SDRAM. Can any body help me to solve this problem? Thank you very much in advance. Here is my program and SDRAM controller core manual https://www.alteraforum.com/forum/attachment.php?attachmentid=1135 https://www.alteraforum.com/forum/attachment.php?attachmentid=1136
