OMAPL138 DDR2 512MBytes configuration

Dmitry Gorulko

Other Parts Discussed in Thread: OMAPL138

Hello!

In accordance with OMAPL138 specification it is possible to use up to 512MBytes of DDR2 memory.

As I understand, 2 DDR2 chips must be used. I have been searching for appropriate configuration but have no success.

The problem is I can see only DDR2 chips with 15-bit row and 10-bit column addressing (x8 banks) which actually allows to have 256MByte (8-bit) memory (x2 chips).

But OMAPL138 has 14-bits row addressing. How can I get 512MByte configuration?

Thank you!

over 13 years ago

0 Brad Griffis over 13 years ago

TI__Guru*** 125430 points

All devices I've seen for 512MB require 15-bit row addressing, so I don't believe there's anything you can buy. Although we can technically support 512MB it unfortunately seems that the necessary configuration is not sold by any memory manufacturers so that effectively limits the device to 256MB.

0 Dmitry Gorulko over 13 years ago in reply to Brad Griffis

Prodigy 120 points

Hmm... kind a trick from TI

0 Brad Griffis over 13 years ago in reply to Dmitry Gorulko

TI__Guru*** 125430 points

We weren't trying to be deceptive. This was all specified many years ago before it was clear what memory organization would be common from the DDR2 vendors. We have filed a bug to change it to 256MB in the next data manual revision.

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OMAPL138 DDR2 512MBytes configuration