max transfer speed using FTDI chip

ch_dupre · Joined: 22 Aug 2006 Posts: 18

Hello there,

We're currently playing with an FTDI chip: FT245.

We can only achieve a transfer rate of about 250kbytes/sec using the D2XX driver. I think this is quite low because FTDI claims a max speed of 1MBytes/sec.

Has anyone managed to achieve a higher transfer rate using FTDI chip?

Thanks,

Christophe D.

rwyoung · Joined: 12 Nov 2003 Posts: 563 Location: Lawrence, KS USA

Depends on how fast you can feed data into the FT245. The best I have gotten for an extended period of time from the FT245 is 1Mbyte/sec (ie 8Mbit/sec). Due to the overhead of the bulk mode transfers, you will never get 12Mbit/s of data through the pipe.

Also, keep in mind that the USB port is a SHARED resource and its capacity of 12Mbit/sec is shared by all devices attached to that hub (ie chipset inside the PC). With other activity and events occuring, the most you should plan on is 10Mbit/sec if everything were perfect.
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Rob Young
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digitalmg · Joined: 12 Apr 2007 Posts: 2

With 245BM I have max. 350k/s but with virtual com port.