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The BeMicro SDK designs come with a Microtronix MDDR controller evaluation core. They use the 1.8V I/O standard, which allows them to use the thresh pin on the bank as the CS pin of the DDR.
Whenever I try to use another DDR controller, the 1.8V I/O standard causes a fitter error. Error (165021): The "1.8 V" I/O standard and/or the "8mA" current strength on the pin "RAM_D0" is not supported for DDR/DDR2 external memory interfaces Info (165023): The combination of the I/O standard "SSTL-2 Class I" and the current strength "8mA" is a supported setting Info (165023): The combination of the I/O standard "SSTL-2 Class I" and the current strength "12mA" is a supported setting Info (165023): The combination of the I/O standard "SSTL-2 Class II" and the current strength "16mA" is a supported setting etc, etc, If I try to use one of the 1.8 SSTL standards for the I/O, it throws a fitter error telling me that the thresh pin is already used. Now the 1.8V I/O standard obviously works on this board on those pins with this DDR. Does anyone know how to force the ALTMEMPHY to use 1.8V? Thanks!! BobLink Copied
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The BeMicro-SDK uses LPDDR memory. The ALTMEMPHY did not used to support this memory (but perhaps 13.0 does, I didn't check).
Arrow's European site has a download for an LPDDR controller: http://www.arroweurope.com/markets-solutions/solutions/bemicro/bemicro-sdk.html I haven't tried it ... Cheers, Dave- Mark as New
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--- Quote Start --- Whenever I try to use another DDR controller, the 1.8V I/O standard causes a fitter error. --- Quote End --- There is more differences between regular DDR and mobile LPDDR than just the I/O standard. This Micron note describes some of the issues, but long story short: just changing the I/O standard isn't going to result in a usable system. http://www.micron.com/~/media/documents/products/technical%20note/dram/tn4615.pdf
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--- Quote Start --- The BeMicro-SDK uses LPDDR memory. The ALTMEMPHY did not used to support this memory (but perhaps 13.0 does, I didn't check). Arrow's European site has a download for an LPDDR controller: http://www.arroweurope.com/markets-solutions/solutions/bemicro/bemicro-sdk.html I haven't tried it ... Cheers, Dave --- Quote End --- I did. Works just fine. Thanks!!!
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--- Quote Start --- I did. Works just fine. --- Quote End --- Excellent, thanks for letting the forum know! Cheers, Dave

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