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SWRITE transfer is a streaming write transfer for efficient transfer by omitting byte enable processing, so it transfers in units of 8 bytes. Also, the maximum transfer length for one packet is 256 bytes.
Therefore, when transferring 260 bytes, for example, after transferring 256 bytes, transfer 8 bytes continuously, and add processing on the user circuit side to extract 4 bytes of those as valid data. method will be used.