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Can the BF54x DDR support 1Gb memory?

Question asked by kaushal Employee on Apr 13, 2009
Latest reply on Apr 13, 2009 by kaushal



Is there an manual/data sheet error of the size of DDR that BF54x can be supported?

From BF54x HRM,


* Supports industry standard  double data rate (DDR SDRAM) from 64 Mbit to
512 Mbit device sizes with a  configuration of x4, x8, or x16.
* Provides 16-bit wide data interface to  DDR SDRAM.
* Supports up to 256 MB of DDR SDRAM with one external bank.


The manual said BF54x can support up to 256MB per external bank,  however,
there is another paragraph saying that it can support up to  512Mb device which
is only 64 MB. This description is confusing. Can we  connect a 1 Gbit or
larger DDR? If not, how can we get 256MB per  external bank.
For DDR of size greater than 512Mbit, for example 1Gbit  DDR as attached, there
are 14 address pins, A13~A0, which BF only has 13  address pins, DA12~DA0.