Using 512MB DDR2 with OMAP-L138

Carl19034

I am having some problems connecting 512MBytes of DDR2 to the L138. It looks like the row/col address bus is limited to 14 bits (A0-13). That would require a sinlge x16 device since x8 devices appear to have 15 address bits (A0-14). If that is the case, currently the only x16 4Gbit parts are very expensive twin die parts.

Is there a method of connecting (2) 256MByte x8 devices of DDR2 to the L138?

over 15 years ago

0 Mariana over 15 years ago

TI__Mastermind 24340 points

Yes, we support having two 256MB x 8 to the DDR2, just connect one to the lower byte of the data bus and one to the upper byte of the data bus.

0 Gus Martinez over 15 years ago in reply to Mariana

TI__Mastermind 29301 points

Mariana,

Carl is right though, the 8-bit memories have to use 14 address lines or less, otherwise our memory controller cannot interface to them. I cannot think of a way of disabling the extra address pin on 8-bit memories and I would think leaving it floating is not an option.

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Using 512MB DDR2 with OMAP-L138