[CentOS] USB 2.0 device on a USB 3.0 plug

[John R Pierce]

On 2/16/2017 1:12 PM, Gordon Messmer wrote:
> On 02/16/2017 12:28 PM, John R Pierce wrote:
>> USB 1 and 2 used 4 pins.    USB 3 ports have an ADDITIONAL 5 pins, 
>> the original 4 are used for USB 1/2 operation, the new 5 only for USB 
>> 3 operation.   they are effectively two completely independent 
>> controllers. 
>
>
> Do you mean USB type C?  USB 3 is supported and most commonly uses 
> type A plugs & ports, which should support older devices. 

look very closely at a USB 3.0 port, with the 'blue' tongued A 
connector, and you'll see 5 additional pins in there behind the standard 
USB1/2 4 pins.

https://files.cablewholesale.com/mailimages/usb-30-type-a-connector-det-small.jpg 
(male)

http://p.globalsources.com/IMAGES/PDT/BIG/663/B1079644663.jpg (female)


-- 
john r pierce, recycling bits in santa cruz