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XQD card is a memory card format primarily developed for flash memory cards. It uses PCI Express as a data transfer interface.
At 7 September 2016, the CFA announced the successor of XQD, CFexpress. This new standard uses the same form-factor and interface but uses the NVMe protocol for higher speeds, lower latencies and lower power consumption.
This url has a lot of information.
http://pinouts.ru/Slots/pci_express_pinout.shtml
PCI-E is a serial bus which uses two low-voltage differential LVDS pairs, at 2.5Gb/s in each direction [one transmit, and one receive pair]. PCI Express supports 1x [2.5Gbps], 2x, 4x, 8x, 12x, 16x, and 32x bus widths [transmit / receive pairs].
The differential pins [Lanes] listed in the pin out table above are LVDS which stands for: Low Voltage Differential Signaling.
PCI-Express 1x Connector Pin-Out
Pin
Side B Connector
Side A Connector
# Name Description Name Description
1 +12v +12 volt power PRSNT#1 Hot plug presence detect
2 +12v +12 volt power +12v +12 volt power
3 +12v +12 volt power +12v +12 volt power
4 GND Ground GND Ground
5 SMCLK SMBus clock JTAG2 TCK
6 SMDAT SMBus data JTAG3 TDI
7 GND Ground JTAG4 TDO
8 +3.3v +3.3 volt power JTAG5 TMS
9 JTAG1 +TRST# +3.3v +3.3 volt power
10 3.3Vaux 3.3v volt power +3.3v +3.3 volt power
11 WAKE# Link Reactivation PWRGD Power Good
Mechanical Key
12 RSVD Reserved GND Ground
13 GND Ground REFCLK+ Reference Clock
Differential pair
14 HSOp(0) Transmitter Lane 0,
Differential pair REFCLK-
15 HSOn(0) GND Ground
16 GND Ground HSIp(0) Receiver Lane 0,
Differential pair
17 PRSNT#2 Hotplug detect HSIn(0)
18 GND Ground GND Ground
Attachment: 64EEDC30-3FF9-41A2-93FE-D6A99E89F022.jpeg (Downloaded 21 times)
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