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请问：tlv2556采用+5V供电，能和DM6437的McBSP端口直接连接吗？是否必须加电平转换？
另外，DSP的GPIO口能和MC74HC04（5V供电）直接相连吗？是否也必须加电平转换？要是必须加转换，采用SN74LVC8T245好，还是74CBTD3384好，还是二者都可以？
