We are using the Samsung 256 Mb N-die model K4S561632N-LI75 (http://www.samsung.com/global/business/semiconductor/file/2011/product/2010/5/24/425848ds_k4s561632n_industrial_rev10.pdf) with the CPU --- LPC4357FET256 ARM Cortex-M4/M0|32-bit MCU|NXP.
We have been unsuccessful in putting the SDRAM into a deep sleep mode (turning off). No mater what we do, the deep sleep current draw stays ~8 mA. We do not need to preserve the content in the SDRAM.
So, how can we configure the EMC on a Cortex M4 to put the SDRAM in deep sleep (minimal current draw)?
Thanks in advance!