Quick Question about Xbox 360 EDRAM?

jpr27

Regular
I recently saw the recent pictures of the chip layout of the EDRAM and was wondering why it looks to be seperated into 4 sections (see pics posted by Dave in the chip source reference question)? Is this to help with parallelism or is it a breakdown in the terms of the logic that it contains?

Sorry if this has been asked before but I couldnt find under the search function other then the EDRAM general info. Any breakdown of the chip would be appreciated now that we have pics :)
 
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