Xiaofan, thanks for your reply,
can have multiple packets (up to 64Bytes for full speed bulk endpoint) > per transfer, actually up to 19 for full speed USB. So the theoretically > the maximum transfer rate for full speed USB bulk transfer is > 19x64=1216 Bytes/ms. > > FT245R's receive buffer is double the max packet size (64x2=128) and > the transmit buffer is quad the max packet size (64x4=256). So it can > approach the maximum transfer rate limit of Full Speed Bulk Endpoint. > The driver of course need to be able to sustaining the data rate. So > FTDI has its own driver and not use Windows' lousy usbser.sys driver. > Basically what you are saying is that in the: "Data transfer rates up to 1Mbyte / second." what they mean is 125Kb/s downspeed (host -> FT245 data transfer) and 250Kb/s upspeed (FT245 -> host data transfer) = ~~ 1Mb/s (actually 750 Kb/s) ?? So you agree that when looking at the speed of data in one direction only (host -> FT245R transfers) the speeds is indeed only 125 Kb/s ? Or am I mis-interpreting? Greetings, Jan Wilmans -- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. To unsubscribe send a mail to [email protected]
