Question on a PCI connector resistor

Hello,

I have one question on a connection on EVM6437.

On its PCI connector, I found that B3 GND is connected to VCC_3V3 rather than ground, and there is a NO-POP placeholder R164 connected with B3. Most important is that B3’s net PCI_PLUGn is then used to control {PCI_DETECTn & PCIEN} signal.

Is this configuration something like a pulling-up? When there is no PCI device connected, B3 will be pulled up by VCC_3V3 to high, thus effectively making

On the other hand, if a PCI device is connected, B3 will be connected through the device to other GND pins and has voltage low, making

So it is indeed provide DETECT and ENABLE functionality as the associated signal names suggest.

So in this regard R163 is essentially a pull-up?

Thanks,

Zheng