multiple chip select is not supported by cyclone iii?????

Question

I use ddr2 HPC.

when i set "chip selects per DIMM=2" and "Total Memory chip selects=2".

I get an error :Multiple chip select is not supported by cyclone iii.（quartus ii 9.0）

i used quartus ii 9.1 ,there was not error.but nios ii eds 9.1 can`t work perfectly on win7.So i changed to 9.0.But this new error happened .

what should i do????:confused:

P.S. there was also a warning :"calibration performed on all chip selects;timing

analysis only performed on first chip select.manual timing derating is required ."

can i ignore it?

altera_forum · Answer

the ddr2 sdram is MT47H256M8.(MICRON)

Row address------------- 16K A[13:0]

Bank address------------ 8 BA[2:0]

Configuration------------- 16 Meg x 8 x 8 x 2

Column address---------- 1K A[9:0]

Rank address-------------- 2 CS#[1:0]

altera_forum · Answer

Any one can help??

altera_forum · Answer

Seems to be an undocumented limitation respectively a bug. Ask Altera.

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