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3.3.24 I2C EEPROM Socket
I2C EEPROM Flash Socket
Pin
Signal
1
-up 1.8V_DSW
2
-up 1.8V_DSW
3
-up 1.8V_DSW
4
GND
Signal description:
®
I2C_PM_DAT: SMARC
module Power management I2C bus DATA
I2C_PM_CK: SMARC
®
module Power management I2C bus CLK
There is a dedicated 2-way jumper, JP14, for driving signal I2C_Write Protect, allowing protecting this Flash EEPROM from writings.
3.3.25 JTAG Connector
JTAG Connector
Pin
Signal
Pin
1
+3.3V_ALW
3
JTAG_TRST# (P73)
5
JTAG_TDI (S45)
7
JTAG_TMS (P77)
9
JTAG_TCK (P78)
10
11
10k pull-down to GND
12
13
JTAG_TDO (S46)
14
15
JTAG_RST# (P72)
16
17
---
18
19
---
20
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.
According to SMARC
CN71
(I2C_PM) from card edge connector dedicated to power management functions, such as Smart
Battery System Management. On the CSM-B79 carrier board, this I2C bus is voltage level translated
Pin
Signal
from SMARC
8
1.8V_DSW
In addition, on CSM-B79 carrier board, the I2C_PM bus is directly carried, at 1.8V electrical level,
to an 8-pin Flash Socket, type LOTES p/n ASPI0001-P001A, for the mounting of I2C EEPROMs in
7
I2C_Write Protect
SO-8 format, with the pinout on left table.
6
I2C_PM_CK
5
I2C_PM_DAT
On CSM-B79 carrier board, for Debug Purposes, it is also available a
CN70
MOLEX p/n 70246-2004 or equivalent connector, with the pinout shown
in the left table. Mapping to SMARC
Signal
also provided within brackets.
2
---
Mating connector: MOLEX p/n 22-25-2202 with 70058 series female
4
GND
crimp terminals.
For signal description, do refer directly to SMARC
6
GND
CSM-B79 carrier board.
8
GND
JTAG_TDI and JTAG_TDO signals share the same pins on the card edge connector with MDIO
GND
signals used to manage the PHYs for SERDES interfaces. They are available on this connector only
in case they are supported by the SMARC
GND
SW17 switch 1-3 in OFF position (par.3.3.15).
GND
JTAG_TMS signal shares the same pin on the card edge connector with PCIE_B_CLKREQ# signal
GND
request for M.2 WLAN Key E Slot, while JTAG_TCK shares the same pin on the card edge
GND
connector with PCIE_A_CLKREQ# They are available on this connector only in case they are
supported by the SMARC
GND
ON position and / or 3-way jumper CN78 in 2-3 position.
®
Rel. 2.1.1 specification, SMARC
®
modules before being used by these slave devices.
JP14
I2C_Write Protect
Not Inserted
Writings allowed
Inserted
Writings not allowed
®
module card edge connector pins is
®
module; in this case, to use them as a JTAG, set
®
module; in this case, to use them as a JTAG, set SW14 switch 2-4 in
®
modules have a dedicated I2C bus
®
module user manual intended to be used with
69
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