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Whenever a write operation is to be performed to the S-Port, the CyU3PSibReadWriteRequest() API has to be used with the appropriate parameters. Whenever data is to be read/written to the S-Port, the corresponding commands are to be passed to the S-Port before performing the actual operation. The CyU3PSibReadWriteRequest() API takes care of these commands based on the parameters passed.
Kindly, refer to the fx3_sdk_1_3_3_src for details on this.