JackOfAll wrote: > Another loose end.... > > Zsolt, > > Have just connected the Amanero via a different hub than I was using > last time. I can't reproduce the problems. I was using a powered USB2 7 > port hub, which if I recall correctly wasn't cheap..... Which I seem to > have misplaced for the moment. (Can't find it.) So I'm using a "very > cheap" 4 port USB2 hub, (that I paid the princely sum of £1.50 for), and > no issues at 352k8 / 384k, while copying large quantities of data to a > USB drive also connected to the same hub. > > I wonder if the troubles were down to the original hub being a 7 port > hub. ie. 2x 4 port chips, the second daisy-chained to a port on the > first. Which is going to lead to a question to John. John, you were > talking about an 8 port hub for CSP1/2..... Single chip solution or > daisy-chaining 2x 4 port hub chips?
The one I'm looking at is definitely an all in one 7 downstream port chip. It has a TT for each port. It's the third generation product from the manufacturer so hopefully they have any bugs ironed out by now! One possibility for the problem is that the signal integrity issues for a 7 port box are much more difficult to deal with than for a 4 port one, especially if using a double sided board. Since I'm using a four layer board I can make sure there aren't any SI issues with the board layout. The manufacturer has a sample double layer board layout for the 7 port chip which is a work of art. They had to go through many hoops to maintain even rudimentary SI with all those signals. If some manufactuer didn't follow that I hate to think of what could happen, it wouldn't be pretty. John S. ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=98544
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