What is the right connection of SDRAM chip highest address pins on LPCXpresso546 (OM13098) as per rev E and rev F schematics?

[PabloBaena]

There could be an error on rev E and rev F schematics of LPCXpresso546 (OM13098) board. 

The onboard SDRAM is a 128Mb Winbond's W9812G6JB-6I which has no A12 pin.  However the schematics show as if such non-existing pin was connected, which only applies to a 256Mb  chip, e.g Winbond's W9825Gxx.

Is this so? And for complete clarity, how should the 128Mb SDRAM be connected with the highest LPC546's external memory controller address pins EMC_A14, EMC_A13, EMC_A12 on corresponding BA1, BA0 and A11 ? 

Attached image of SDRAM pins.

Thanks

[FelipeGarcia · Accepted solution]

Hi Pablo,

Thanks for your feedback. This is not an error, this pin is connected to support a 256Mb SDRAM expansion as you mention.

Other than that, 128Mb SDRAM should be connected as schematics show.

Have a great day,
Felipe

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