What is the maximum DDR size that BF54x can support?

Hi,

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.

Kaushal

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  • The data sheet is pretty clear on that: 128MB. Just look at the Figure 3  Internal/External Memory Map

    The HRM is still under review and the numbers (512MB) are wrong. It is 128M for the ADSP-BF52x Blackfin processor family.

    ADSP- ADSP- ADSP- ADSP- ADSP- ADSP- ADSP-
    BF51x BF52x BF531/2/3 BF534/6/7 BF538/9 BF54x BF561
    128MB 128MB 128MB 512MB 128MB 512MB 128MB
    per ext. Bank per ext. Bank

     

     

     

     

Reply
  • The data sheet is pretty clear on that: 128MB. Just look at the Figure 3  Internal/External Memory Map

    The HRM is still under review and the numbers (512MB) are wrong. It is 128M for the ADSP-BF52x Blackfin processor family.

    ADSP- ADSP- ADSP- ADSP- ADSP- ADSP- ADSP-
    BF51x BF52x BF531/2/3 BF534/6/7 BF538/9 BF54x BF561
    128MB 128MB 128MB 512MB 128MB 512MB 128MB
    per ext. Bank per ext. Bank

     

     

     

     

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