关于949 和940 配对使用的问题，手册上说的GPIO[8:5]是寄存器类型GPIO，与GPIO[3:0]的区别在哪里?
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8.3.15.3 GPIO_REG[8:5] Configuration
GPIO_REG[8:5] are register-only GPIOs and may be programmed as outputs or read as inputs through local
register bits only. Where applicable, these bits are shared with I2S pins and will override I2S input if enabled into
GPIO_REG mode. See Table 3 for GPIO enable and configuration.
Note: Local GPIO value may be configured and read either through local register access, or remote register
access through the Bidirectional Control Channel. Configuration and state of these pins are not transported from
serializer to deserializer as is the case for GPIO[3:0].
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