OMAPL138EZWTA3之前外接的MT47H64M16HR-3IT:H 16位64M DDR,工作正常,高低温度测试正常,现在外接MT47H128M16RT-25E AAT:C, 16位128M DDR 70度高温会出现死机现象,请问需要更新DSP的驱动吗?
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#1. 确认原理图上L138上的DDR供电与DDR内存芯片的供电是同一路1.8V, 中间没有用磁珠或电感隔开.
#2. 内存大小换了, SDCR的配置应该要修改.
#3. 原理图上DDR信号线上是否有匹配电阻,如果没有,SDCR的DDRDRIVE要设成weak drive strength.
DQGATE0/1走线符合要求:
DDR2 loopback signal for external DQS gating.
Route to DDR and back to DDR_DQGATE1 with
same constraints as used for DDR clock and data.