Technical Information • PCZ-NVM • CPU Expansion Side Card
NVMe PCIe® x4
M.2 M-Key continued • Pin 39 - 75
GND
39
40
SMB_CLK
PETN0 (SATA)
41
42
SMB_DATA
PETP0 (SATA)
43
44
NC
GND
45
46
NC
PERN0 (SATA)
47
48
NC
PERP0 (SATA)
49
50
PERST#
GND
51
52
CLKREQ#
REFCLKN
53
54
NC
REFCLKP
55
56
RSV
GND
57
58
RSV
M-Key
59
60
M-Key
M-Key
61
62
M-Key
M-Key
63
64
M-Key
M-Key
65
66
M-Key
NC
67
68
RSV
PEDET
69
70
+3.3V
GND
71
72
+3.3V
GND
73
74
+3.3V
GND
75
PCIe/SATA mode detection (pin 69 PEDET) supported on socket M1 only
Power for the M.2 sockets is generated by a +3.3V DC/DC step-down converter, which is wired
normally to the +5V rail provided by the carrier card (via mezzanine connectors). The permanent
current available at the M.2 sockets depends on several conditions, e.g. USB powered devices
attached to the PCZ-NVM and C32-FIO. Thus, very demanding SSDs might require higher power
than can be provided by the carrier card. Additional power can be applied either via the
backplane connector J1 or by means of the ATX auxiliary power connector.
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