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Altera_Forum
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9 years ago

SDRAM + NIOS not working

Dear Forum, as so many questioners here I struggle too to connect an Altera FPGA (EP4CE6E22C8) and a SDRAM to use it as program memory for the NIOS II. I already figured out that the nios2...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

OK seems to be my hypothesis is supported by evidence. I changed the connection on the board (see my attached image "FPGAboard.jpg") and voila now it works. The pll1 out at pin 43 now connects with the sdram clk_in at pin38 of the SDRAM and the former connection to sdram_we now reconnects to pin 60 of the FPGA . I used this occasion also to exchange the blue led’s against green ones and I also increased the pre resistors up to 2k. Maybe one should consider to invest more money into a terasic evalboard – to my knowledge the DE series seems to be well engineered