Compile the DDR2 SDRAM

[Altera_Forum]

hello, girls and guys, i met a problem with the DDR2 SDRAM compilation. 

first i built a small program with the SOPC Builder, and it contains a Nios II/standard, a DDR II SDRAM IP, and a DMA Controller, a PLL, two on chip rams(one is 128K*32b, the other is 64K*32b), a Jtag_Uart, and a Timer. After the suessfullly generation with the SOPC Builder, i used the Quartus II to do the compilation, in the fit procedure, it pops up some error: seems the memory is out of use, so i cutted the DMA, and minimized the on chip ram, just left the DDR II and Nios, also JTAG, and recompiled, but this time, at the beginning of the compilation, the Quartus poped up the following error message in another window.  the detailed information follows: *** Fatal Error: Module: quartus_map.exe Exception: Access Violation 0x132E8 : qcu_read_acf_assignment + 0x107C (comp_qcu) 0xA936 : (quartus_map) 0x94EF : qexe_get_command_line + 0xE1 (comp_qexe) 0xB362 : qexe_run_tcl_option + 0x4E2 (comp_qexe) 0xB3AF : qexe_standard_main + 0x14 (comp_qexe) 0x2A32B : msg_exe_main + 0xDB (CCL_MSG) 0x9D4D : (quartus_map) 0x256D9 : BaseProcessInitPostImport + 0x2E2 (kernel32) 0x83C5FFFF: MEM_MANAGER::s_quartus_memory_counter + 0xFFD6EFC2 (MSVCR71)  End-trace  has anyone met the similar problem before? or has someone used the DDR 2 before? i really want to listen your advice and ideas. Expecting!! thanks in advance!!

[Altera_Forum]

I used DDR 1 and must say there are some bugs left in the component. 

Removing DMA and shrinking the memory was a good idea, you will probably not be able to achieve the required DDR speed (85MHz) with the DMA on the bus. To avoid errors a good solution may be to create the whole project from scratch, or at least remove all DDR references from the .qsf file (remove all non esential files too) and rebuild the DDR component, before rebuilding sopc. The name of the DDR component should be ddr_sdram_0, otherwise scripts have problems with it.  ...  IzI

[Altera_Forum]

hello,iztok.jeras,thanks for your reply, yesterday, i can get access to the ddr2 sdram now. i use that guy as the program buffer. 

thanks !