SMBus 2.0协议描述文件PDF
5.4.1.3 中描述了PEC(Packet Error Checking)计算的是所有进来或输出的信息：
The PEC is appended to the message as dictated by the protocols in section 5.5. The PEC calculation includes all bytes in the transmission, including address, command and data. The PEC calculation does not include ACK, NACK, START, STOP nor Repeated START bits. This means that the PEC is computed over the entire message from the first START condition.
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