>>>>> "Spencer" == Spencer Oliver <s...@spen-soft.co.uk> writes:

    Spencer> On Jul 15, 2011 3:39 PM, "Xiaofan Chen" <xiaof...@gmail.com>
    Spencer> wrote:
...
    Spencer> On some PC's I even found speed increase when running the jtag
    Spencer> dongle through an external powered USB hub.

This happend with the older devices without "H". They run USB 2.0 Full
Speed, where many controllers only schedule with 1 ms slots. Connecting a
USB-2.0 High Speed hub, allows the mainboard controller to schedule at 125
usec steps and so sppeds things up.

For FT2232H/FT4232H and FT232H there should be no difference

Bye
-- 
Uwe Bonnes                b...@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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