SDRAM interconnections on Blackfin

Hi,

I am using a 512Mb SDRAM ( MT48LC32M16A2TG-75 IT-C ) with 16bit data & 13 bit address lines. Following table shows the interconnection,

SDRAM
DSP( EBIU - sdram )



CLK
SCLK
CKE
SCKE
A0 - A9
ADDR2 - ADDR11
A10
SA10
A11 - A12
ADDR13 - 14
BA0-1
ADDR18 - 19
D0 - D15
DATA0 - DATA15
DQML
/ABE0
DQMH
/ABE1
/CS
/SMS0
/WE
/SWE
/CAS
/SCAS
/RAS
/SRAS

I am not confident with the connection of address lines, Do I have to connect A0 of SDRAM to /ABE3 of BF5561 ?

FYI,

I am using BlackFin ADSP-BF561SBBCZ .


Best Regards,

Sunil
  • Hi Sunil,

    I have branched your latest question into a new thread and moved it from the Software Modules and SDKs comunnity to the Blackfin Processors community.

    Please continue this discussion here.

    Regards,
    Colin

    •  Analog Employees 
    on Apr 18, 2014 11:34 PM

    Hi Sunil.

    Your connections appear correct as is and do not require the proposed connection between A0 and /ABE3.  If you consult the BF561 EZ-KIT schematic, you can compare the devices we use there with the one you've selected:

    http://www.analog.com/static/imported-files/eval_kit_manuals/ADSP-BF561_ezkit_man_rev.3.3.pdf

    Note on page 75 the EBIU connections for this pair of MT48LC16M memories, which are 1/2 the density of yours at 4MB x 16 x 4 banks.  If you compare the datasheet for this memory device with the one you've selected (MT48LC32M16), you will note that the only place they differ in terms of the addressing scheme is that this device requires A9 for the extra column address, whereas the LC16 only needs up to A8.

    -Joe

  • Hi Joe,

    Thank you for the info. I still have a doubt,

    In ADSP561 Hardware reference guide, they have provided a table shows address line connection between SDRAM & BF561.
    It is matching with the BF561 EZ-KIT where they have used two 16 bit SDRAM chips in 32 bit mode( 2 chips each 256Mb - 64MB).

    We are using one SDRAM of 64MB with 16 data bit bank, In the table they have told to connect A0 to SDQM3 or /ABE3.

    The table is given in Page No. 16-60, table 16-12, of the ADSP561 Hardware reference, revision 1.4, February 2013.

    As you said current connections are fine, but in the table they have showed to connect A0 to ABE3.

    Kindly help me with this ASAP.`

    Regards,.
    Sunil