Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
Valued Contributor III
834 Views

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

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
0 Kudos
4 Replies
Highlighted
Valued Contributor III
12 Views

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
0 Kudos
Highlighted
Valued Contributor III
12 Views

 

--- 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
0 Kudos
Highlighted
Valued Contributor III
12 Views

 

--- 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!!!
0 Kudos
Highlighted
Valued Contributor III
12 Views

 

--- Quote Start ---  

I did. 

 

Works just fine. 

 

--- Quote End ---  

 

 

Excellent, thanks for letting the forum know! 

 

Cheers, 

Dave
0 Kudos