am335x system upgrade replace DDR and CPU models

1 Scope of Document
This document describes replace DDR and CPU notes

2 Requiremen
2.1 Function Requirement
Default we support AM3352BCZ00, now we want to support AM3352BZCA100。

Default memory capatity 256M, now we want to support 512M and 1024M.

2.2 Performance Requirement
NA

3 Hardware Overview
CPU: AM3352BCZ100 AM3352BCZA100
DDR: MT41K256H16HA-125E 4Gbit
　　　MT41K512H16HA-125E 8Gbit

4 Functional Description
4.1 Functional Block Diagram
通过如下表格所示：我们可以知道VDDS_DDR跟外部的DDR的类型是有关系的。

VDDR_CORE VDDR_MPU跟CPU工作的主频有关系。

且VDD_CORE的电压范围与其支持的DDR的速率是有关系，如下所示

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来源： https://blog.csdn.net/weixin_30965175/article/details/114793347