A customer of ours is designing an i.MX6 processor board for a USB powered application. He would like to disable power to the DDR3 until the i.MX6 has booted and negotiated the 500mA current on the USB. On power up the spec demands no more than 100mA.
The concern is that the inputs to the DDR3 could potentially be driven from the i.MX6 without power on the DDR3 power rails and cause the DDR3 to draw current. Does NXP have any recommendations for this scenario and prevent the DDR3 from drawing any current?