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16-bit sdram and 32-bit opb bus

Started by Frank December 12, 2003
Is it possible to use the opb sdram controller with a 32-bits opb bus to a
microblaze one side and a 16-bits sdram to the other side? What if I do a
32-bits access to sdram. Will the controller convert this automatically in
two 16-bits cycles? The datasheet of the opb sdram controller says: "Since
the sdram will always be accessed to provide data the width of the OPB bus,
...". So it looks like it will convert a 32-bits access to two 16-bits
accesses, but can anyone acknowledge this?

Frank


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Hello Frank,

You are exactly right - the OPB SDRAM controller will convert the 32-bit access
on the OPB bus to two 16-bit accesses to the SDRAM. (it actually looks like a
SDRAM burst of 2).

Thanks!
anita

Frank wrote:

> Is it possible to use the opb sdram controller with a 32-bits opb bus to a > microblaze one side and a 16-bits sdram to the other side? What if I do a > 32-bits access to sdram. Will the controller convert this automatically in > two 16-bits cycles? The datasheet of the opb sdram controller says: "Since > the sdram will always be accessed to provide data the width of the OPB bus, > ...". So it looks like it will convert a 32-bits access to two 16-bits > accesses, but can anyone acknowledge this? > > Frank
--------------1EA3A62E7EFC12E1489A56DB Content-Type: text/x-vcard; charset=us-ascii; name="anitas.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Anita Schreiber Content-Disposition: attachment; filename="anitas.vcf" begin:vcard n:Schreiber;Anita tel;fax:(505)798-4809 tel;work:(505)798-4819 x-mozilla-html:FALSE org:Processor IP Design;<img src=http://www.xilinx.com/images/xlogoc.gif> adr:;;7801 Jefferson Blvd., NE;Albuquerque;NM;87109;USA version:2.1 email;internet:anita.schreiber@xilinx.com title:Senior Staff IP Design Engineer fn:Anita Schreiber end:vcard --------------1EA3A62E7EFC12E1489A56DB--