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z240 port for USB3 SD card pinmap

HP Recommended
z240

Dear all, 

I am very confused with the black 11pin (12pin with one unconnected pin) port under USB3.0 connector in Z240 SFF.

Based on specsheet, it's USB3.0, and dedicated to connect SD-card reader (HP USB3.0 SD4 Card Reader Board 797441-001).

797441-001 has 12pin connector.

And, when one want to connect old USB2 SD-card reader, HP probides the USB3 to 2 converter only uses 10 pin.

 

So, I am pretty sure, the black 11pin port is for single USB3.0 port.

Anybody knows the pin-map? Since I want to connect some internal USB3 device in this port. 

 

image_1pw1gza.png

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