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Re: MacBook Pro: differences between left-side USB ports and right-side port?



The right port on a MacBook Pro shares a full speed UHCI controller with the Keyboard/Trackpad USB device.

If you attach a high-speed hub, you will force the port to be connected to the high-speed EHCI contoller.

David Ferguson
USB Software Team


On Oct 23, 2006, at 10:13 AM, Andy Peters wrote:

Gang,

According to DigiDesign, there's a difference between these ports.

From http://www.digidesign.com/index.cfm? navid=54&langid=100&categoryid=35&itemid=22934 :

Compatibility Alert

Use of Mbox, Mbox 2 or Other USB Audio Devices on the Right-Hand USB Port Is Not Recommended
The 15" MacBook Pro models have 1 USB port on the left side, and one USB port on the right side.
The 17" MacBook Pro models have 2 USB ports on the left side, and one USB port on the right side.
Due to internal USB architecture issues on the MacBook Pro, use of Digidesign, M-Audio, or third-party USB audio devices is supported on the left-hand USB ports only (the port or ports next to the power adapter cable).
Use of such devices on the right-hand USB port is not advised because it may cause audio interrupts and/or dropped samples.
However, the use of an iLok on the right-hand port has been qualified and is fully supported.


However, according to the MacBook Pro Developer Note http:// developer.apple.com/documentation/HardwareDrivers/Conceptual/ MacBookPro_0601/index.html , at least how I read it, there's no difference between the two ports.

What's DigiDesign talking about?

-a

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References: 
 >MacBook Pro: differences between left-side USB ports and right-side port? (From: Andy Peters <email@hidden>)



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