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Why I think Async will never work.

Posted by Gordon Rankin (M) on September 13, 2006 at 08:14:02

In Reply to: Re: so, good or bad? posted by ThomasPf on September 13, 2006 at 00:05:43:

Thomas,

After doing testing for like 2 months having the master clock in the dac is not the answer.

The problem with async is that now you are so dependent on the following items:

1) Host Operating system.
2) Host USB Controller
3) USB controller port structure.... (i.e. single output to internal hub as compared to multiple direct connections).
4) Other USB devices on the chain.
5) Speed of the host processor.
6) Device layer drivers

I have 3 computers with XP on them and only one can deliver Async without burping and that is with custom drivers. I have 5 MAC machines and they work better but still not as good as in ISO mode again with custom drivers.

In general ISO has the highest priority of any device on the chain. Therefore the best thing to do is just make sure the dac side of things does it's best to provide a stable low jitter system on it's end.

Thanks
Gordon

J. Gordon Rankin

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