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RE: Guys remember what the cable does and why they make a difference

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In Reply to: RE: Guys remember what the cable does and why they make a difference posted by Adal on February 18, 2008 at 16:01:58

You got it. There is very little buffering in the typical USB interface. Gordons has a bit more than typical because he does a hand-shake and presumably gets it in bursts.

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RE: Guys remember what the cable does and why they make a difference - Adal 06:59:13 02/19/08 (0)
The PLL is locked on all the bits on the USB wire or only on the payload information? If only on the payload, it is stopped in the interval between consecutive packets?
In bursts? - Slider 22:00:48 02/18/08 (0)
I believe he still uses isochronous, only with async endpoint to adjust source rate, so PLL still needed to lock on bus. Plenty of ways for jitter from the PLL clocks to get to the audio clock circuits, even when the sample clock is derived from a local oscillator. No huge surprise there. Still looks like a nice, simple design though.

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