2 16bit SDRAM interfacing vs one 32-bit SDRAM interfacing

lpcware — Wed, 15 Jun 2016 17:54:40 GMT

Content originally posted in LPCWare by jay123 on Fri Apr 11 03:02:46 MST 2014
Hello,

i'm working with LPC1788 and i have working LPC1788 development board, in that development board 2 SDRAM use for LCD data
One SDRAM for D0 to D15 and other for D16 to D31, all control lines and adress lines are common for both SDRAM. this board work fine.
SDRAM use: 4M X 16 bit X 4 banks
Part No: MT48LC16M16A2 , Micron

but in my own design board , i'm facing problem with SDRAM,
SDRAM used : 2M X32Bit X 4 banks
Part No: EM638325TS-6G, Etron
also tried with : MT48L2M32B2, micron

with LCD initialize:
1) when trying to write 0xFFFFFFFF data to SDRAM controller hang and not responding

without LCD:
no problem issue complete SDRAM read write function work

can anybody tell me
1) why two 16bit SDRAM use for LCD data
2) if any body have any solution plz share

Re: 2 16bit SDRAM interfacing vs one 32-bit SDRAM interfacing

lpcware — Wed, 15 Jun 2016 17:54:41 GMT

Content originally posted in LPCWare by mc on Sun Apr 13 06:58:00 MST 2014
Hi Jay123,
Are you using SDRAM in RBC(Row Bank Column) mode or BRC mode(Bank row column)? You will have to program correct mode word according to SDRAM configuration and used mode. Sometimes SDRAM appears to be working even with wrong mode word, however it does not work correctly.

Could you please post mode word and schematic of the board?

LPC Microcontrollersのトピック2 16bit SDRAM interfacing vs one 32-bit SDRAM interfacing

2 16bit SDRAM interfacing vs one 32-bit SDRAM interfacing

Re: 2 16bit SDRAM interfacing vs one 32-bit SDRAM interfacing