Seco Smarc CSM-B79 User Manual page 55

3.3.14 microSIM Slot
microSIM Card Slot
Pin Signal Pin Signal
1 UIM_PWR 5 GND
2 UIM_RST# 6 ---
3 UIM_CLK 7 UIM_DATA
4 --- 8 ---
3.3.15 PCI-e ports
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According to SMARC Rel. 2.1.1 specification, SMARC
To allow the maximum flexibility, on CSM-B79 there is a dual DIP switch SW17, type ADIMPEX p/n KVT04602-R, in order to allow the routing of PCI-e root ports.
For PCI lanes #A and #B, these can be routed to M.2 Key E Slot CN36 (PCIe #B) and M.2 Key B Slot CN38 (PCIe #A) or to PCI-e x4 slot CN33, according to 2-4
position of SW17 (see table below).
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Since, according to SMARC Rel 2.1.1 specification, PCI lanes #C and #D share the same pins on the card edge connector with the SERDES0 and SERDES1
interfaces (SERDES0/ PCIe #D and SERDES1/ PCIe #C), based on the SMARC
SERDES1 (par.3.3.11) or to PCI-e x4 slot CN33, according to 1-3 position of SW17 (see table below).
SW17 position
ON position (1-3)
OFF position (1-3)
ON position (2-4)
OFF position (2-4)
The options for connectors used when routing PCIe lanes to M.2 Key E Slot CN36 (PCIe #B, par.3.3.12), to M.2 Key B Slot CN38 (PCIe #A, par.3.3.13) and
SERDES (par.3.3.11) have been already described at reference paragraphs.
CSM-B79
CSM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R - Reviewed by S.R. - Copyright © 2021 SECO S.p.A.
Interfaced to the M.2 WWAN slot CN38, there is a microSIM Card Slot, to be used in conjunction with M.2
CN40
Socket 2 Key B modems. Here it is possible to insert the microSIM card provided by any telecommunication
operator for the connection to their network.
The socket is type MOLEX. p/n 78800-0001or equivalent, with the pinout shown in the table on the left.
For ESD protection, on all signal lines are placed clamping diodes for voltage transient suppression.
Signals related to UIM (SIM) card have already been described in previous paragraph.
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modules foresee a maximum of 4 PCI-e x1 lanes, which can also be grouped (depending on the SMARC
-e reference clocks are also provided.
PCIe routing selector
SERDES0 / SERDES1
PCIe #C, #D to PCI-e x4 slot CN33
PCIe #A, #B to M.2 Key E Slot CN36 (PCIe #B) and M.2 Key B Slot CN38 (PCIe #A)
PCIe #A, #B to PCI-e x4 slot CN33
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to SERDES0 /
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