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I want to receive 0x200000 bytes data by vendor request. I send 64 vendor requests which length are 0x8000 bytes. But sometimes a error occurred. I changed the number of vendor request and size to 512 and 0x1000 bytes, but same error occurred again. I used a protocol analyzer. According to the attached log file, I couldn't find the bus error, but the transfer stopped. And I used a debugger, CyU3PUsbSendEP0Data returns the error code 69(CY_U3P_ERROR_TIMEOUT). I want to know the reason and solve the problem. SDK:1.2.3 OS:Windows XP Host Controller:Renesas uPD720200(Driver:126.96.36.199/Firm:2020)