Hello，
My system is Windows 10. And my codes for the experiment almost the same as the example of the document. Actually, when I send only one byte from FPGA to PC (the rate is 1MB /s), the nTXE signal keeps low witout any HIGH state( I use FPGA to make a LED on once the nTXT turns HIGH only once). And the Bushound software also shows the accurate 1MB /s result. But when gradually raise the rate from only 1 byte per uS to tow bytes, three byes, four bytes and so on, the nTXE begins to show HIGT state, and with the rising of the rate, the HIGH state more frequently. The Bushound keeps showing righr rate. Howevery, when I send more than 24 bytes (24MB /s rate at this time)，the Bushound gives the highest result of 24.5MB /s all the time although maybe  I  have sended 32 bytes to PC. Of course, at this time the nTXE HIGH state very frequently (the monitoring LED is almost on al the time). My feeling is that the FT_Read calling seems a little slow to move data to the reading buffer though I ' not sure if it is related to the windows system.
 Thank you.