1.8V I/O for DDR Controller? (BeMicro SDK MDDR)

[Altera_Forum]

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!!  Bob

[Altera_Forum]

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

[Altera_Forum]

--- 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

[Altera_Forum]

--- 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!!!

[Altera_Forum]

--- Quote Start ---  I did.  Works just fine.   --- Quote End ---    Excellent, thanks for letting the forum know!  Cheers, Dave