自己设计方案，TI工程师帮忙审一下

对照硬件设计手册确认满足各个外设的设计要求即可。初步来看问题不大，注意外接DDR3芯片的要求如下：

DDR3外接RAM要求：

• 72-bit: Five 16-bit SDRAMs (including 8 bits of ECC)

• 72-bit: Nine 8-bit SDRAMs (including 8 bits of ECC)

• 36-bit: Three 16-bit SDRAMs (including 4 bits of ECC)

• 36-bit: Five 8-bit SDRAMs (including 4 bits of ECC)

• 64-bit: Four 16-bit SDRAMs

• 64-bit: Eight 8-bit SDRAMs

• 32-bit: Two 16-bit SDRAMs

• 32-bit: Four 8-bit SDRAMs

• 16-bit: One 16-bit SDRAM

• 16-bit: Two 8-bit SDRAM