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Chapter 4: Motherboard Connections
M.2 Slot
Two PCI-E M.2 slots (M.2-P1/M.2-P2) are located at JM2-1/JM2-2 on the motherboard. An
M.2 slot replaces a mini PCI-E slot. It supports PCI-E 3.0 x4 (32 Gb/s) SSD cards in the
2260, 2280 and 22110 form factors.
I-SATA 3.0 Ports
This motherboard has eight I-SATA 3.0 ports (I-SATA0-3, I-SATA4-7) supported by the C621
chipset.
CN Connectors (CN10-17)
CN connectors are used to connect PCI buses from processors to PCI-E slots using OCuLink
x8 or x4 Y cables.
CN Connectors
Connector
Description
CN10-17
OCuLink connectors used to connect PCI-E buses from processors to PCI-E slots or NVMe
backplanes (via x8 to x4 Y cables) (
Note
: Y cables are needed to connect NVMe backplanes)
CN10
OCuLink connector supported by CPU1 PCI-E Port 3 [7:0] and used as CPU1 Master Port for
NVMe side band connections
CN11
OCuLink connector supported by CPU1 PCI-E Port 3 [15:8]
CN12
OCuLink connector supported by Slot1 PCI-E [7:0]
CN13
OCuLink connector supported by Slot1 PCI-E [15:8]
CN14
OCuLink connector supported by CPU2 PCI-E Port 3 [7:0] and used as CPU2 Master Port for
NVMe side band connections
CN15
OCuLink connector supported by CPU2 PCI-E Port 3 [15:8]
CN16
OCuLink connector supported by Slot2 PCI-E [7:0]
CN17
OCuLink connector supported by Slot2 PCI-E [15:8]
Note:
Both JPCI-E1 and JPCI-E2 are lane reversal, which means that CPU PCEe lane [15]
is connected to PCEe lane[0], the first lane of the slots.
Solid State Card Connector
A solid state card connector slot is located at JSDCARD1 on the motherboard. This slot is
reserved for manufacturer use only.
Serial Port
A serial port (COM1) is located next to the power connector (JPW12) on the motherboard.
The COM port header provides serial communication support.
