Other Parts Discussed in Thread: OMAPL138
Hi team,
Due to supply problems with the original MICRON DDR2 (MT47H64M16HR-25E), we chose two replacement DDR2 models, namely M14D1G1664A-2.5 of ESMT and W971GG6NB-25 of WINBOND. At present, there are some problems in the test that need your help:
Test conditions: OMAPL138 core voltage 1.3V, DDR operating voltage 1.80V, DDR clock 156Mhz, constant temperature 50℃
Test situation:
1.MT47H64M16HR-25E, working at a constant temperature of 50 degrees, switching on and off the machine every half hour, about one-thousandth of the probability of application can not start (file system error), return to normal after cooling;
2. M14D1G1664A-2.5, working at a constant temperature of 50 degrees, switching on and off the machine every half hour, about 50% probability of application program can not start (file system error), return to normal after cooling;
3. W971gg6nb-25, working at a constant temperature of 50 degrees, switching on and off the machine every half hour, about 50% probability of application can not start (file system error), return to normal after cooling;
The DDR2 circuit schematic diagram of the core board is as follows:
OMAPL138 DDR2 controller registers are configured as follows:
DRPYC1R = 0x000000c3
SDCR = 0x00134632
SDCR2 = 0x00000000
SDTIMR1 = 0x264a2a09
SDTIMR2 = 0x4412c722
SDRCR = 0x00000260
DDR2 datasheet：
M14D1G1664A(2P)_operation temperature condition -40~95℃.pdfMT47H64M16HR-25EIT(BGA-84),DDR.pdf6472.W971GG6NB_A01.pdf
