Vecow MTC-7000 Series User Manual page 28

2.3.3 CN4 : Mini PCIe, mSATA
Both mSATA and Mini PCIe share the same form factor and similar electrical
pinout assignments on their connectors. There was no clear mechanism to
distinguish if a mSATA drive or a Mini PCIe device is plugged into the socket until
recently that SATA I/O issued an ECN change (ECN #045) to redefine pin43 on
mSATA connector as "no connect" instead of "return current path" (or GND).
When an mSATA drive is inserted, its pin-43 is "no connect", and the respective
pin on the socket is being pulled-up to logic 1. When a Mini PCIe device is
inserted, its pin-43 forces the respective pin on the socket to ground, or logic 0.
The pin assignments of CN4 are listed in the following table :
Pin No.
51
49
47
45
43
41
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
©Vecow MTC-7000 User Manual
Signal Name
Reserved
Reserved
Reserved
Reserved
SATA_PCIE_SEL
+3.3Vaux
+3.3Vaux
GND
GND
PETp0
PETn0
GND
GND
PERp0
PERn0
GND
Reserved
Reserved
Mechanical Key
GND
REFCLK+
REFCLK-
GND
CLKREQ#
Reserved
Reserved
WAKE#
CN4
Pin No. Signal Name
52 +3.3Vaux
50
48
46 Reserved
44 Reserved
42 Reserved
40
38 USB_D+
36
34
32 SMB_DATA
30 SMB_CLK
28
26
24 +3.3Vaux
22 PERST#
20 reserved
18
16 Reserved
14 Reserved
12 Reserved
10 Reserved
8 Reserved
6
4
2
GETTING TO KNOW YOUR MTC-7000
GND
+1.5V
GND
USB_D-
GND
+1.5V
GND
GND
1.5V
GND
3.3Vaux
21