Long Packet Structure

Packet Header (4 bytes)

• Data Identifier (DI) * 1byte：Contains the Virtual Channel[7:6] and Data Type[5:0].
• Word Count (WC) * 2byte：defines the number of bytes in the Data Payload.
• Error Correction Code (ECC) * 1byte：allows single-bit errors to be corrected and 2-bit errors to be detected.

Data Payload (0~65535 bytes)

• Length = WC × bytes

Packet Footer (2 bytes)：Checksum

• If the payload has length 0, then the Checksum calculation results in FFFFh
• If the Checksum isn’t calculated, the Checksum value is 0000h

Packet Size

• 4 + (0~65535) + 2 = 6 ~ 65541 bytes

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