What is the maximum external SDRAM that i can interface with LPC4337?

[rommeldelcastil]

What is the maximum external SDRAM that i can interface with LPC4337. UM10503 document, table 412 says I can interface three 256MB and one 128MB. What is MB? is ti MegaBytes or Megabits? i have read on some forums that this is Megabits. If it is Megabits why does adress range in table 412 of UM10503 seems bigger than its max capacity?

[soledad]

Hello Rommel,

Pls refer UM1053, page38. the memory map show the SDRAM interface will be DYCS0/1/2/3, 4parts.

the DYCS0 memory range only 128MB, the others(DYCS1/2/3) are 256MB, these maps are chip designs. 

The 'MB' is megabytes, so if customer SDRAM connected use DYCS0 with LPC43xx, the capacitor will be 128MB max.

if use DYCS1/2/3 connect with SDRAM, the max capacitor will be 256MB.

SDRAM configure as pictures2(UM10503, page 612).

Please remember that most SDRAM vendor's product is only 32MBytes (256Mbits, 4M*4bank*16). 

Have a great day,
Sol

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