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[BF701] external DDR SDRAM clock limitation on datasheet

Question asked by sofy Employee on Jan 28, 2016
Latest reply on Feb 1, 2016 by sofy

Hello,

The customer try to use BF701 with DDR2 SDRAM.

 

BF701 sysclock(fSYSCLK) max is 100MHz.

But according to BF70x datasheet page 51 Table 17 (attached below).

DDR clock (fDCLK) should smaller than fSYSCLK that mean fSYSCLK > 100MHz.

On the other hand, Table 17 also specified fDCLK min max value as 125MHz to 200MHz.

 

It seems that due to BF701 fSYSCLK max is 100MHz, fDCLK doesn't fit between 125MHz to 200MHz.

Does it mean BF701 is not support DDR2SDRAM?

or

"ratio restriction" on Table 17 unit is not MHz?

 

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Thank you for your help in advance.

Best regards,

Sofy

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