How do I enable the 4MB SRAM on the MPC5676R DAT516?

[lukeng]

Hi,

I am wondering how to enable the 4MB of SRAM soldered onto the MPC5676R DAT516 daughter card.  I have gone through the manual it indicates JP4 is the SRAM_SEL jumper but no details on how to actually get this to work.  Do I jump 1-2, 2-3 leave it open?  Then, do I map the 4MB into the SRAM area (0x40000000) or is this considered External (0x20000000).  This may be basic stuff but its a mystery to me.

Any help would be appreciated.  Thanks.

Luke

[davidtosenovjan]

It depends whether you have configured CS0 or CS1.

You may see my example code here, it initialized external RAM in main.c file, function External_SRAM_init:
https://community.nxp.com/docs/DOC-102745 

My initialization uses CS0 thus JP4 needs to be in position 1-2. Then you’ll access address 0x20000000 and higher.