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TMS320F28377S SCI BOOT MODE疑问

您好,

在选择SCI BOOT时,SCIA有两种选择,

SCI-Boot0 : GPIO84和85 ,注释是:  SCIA Boot IO option 1 (default SCI option when chosen through Boot Mode GPIOs)

SCI-Boot1 :GPIO29和28,  注释是:SCIA Boot option 2 – with alternate IOs.

这两个注释要怎么理解?

OPTION0和OPTION1有什么区别?

当对空片进行SCI BOOT操作时,是不是只能用GPIO84和85作为数据传输吗?

谢谢。