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

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

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PabloBaena
Contributor III

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

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FelipeGarcia
NXP Employee
NXP Employee

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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623 Views
FelipeGarcia
NXP Employee
NXP Employee

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

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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