EMAC SoM-A5D36, Руководство пользователя

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SoM-A5D36 User Manual
Revision 1.30 © 2015 - 9 -
2.4.2 JTAG
The SoM specification allows for access to the JTAG lines for the ATSAMA5D36 processor. These
connections will allow the Flash to be programmed in circuit via a program running from the processor
and also the capability to debug software.
Table 2: Processor JTAG
SODIMM
Pin#
SoM
Pin Name
Processor
Pin Name(s)
Description
139 JTAG_TCK JTAG_TCK
JTAG Clock
140 JTAG_TDI JTAG_TDI
JTAG Serial In
141 JTAG_TDO JTAG_TDO
JTAG Serial Out
142 JTAG_TMS JTAG_TMS
JTAG Operation Mode
143 JTAG_TRST JTAG_TRST
Test Reset Signal
144 JTAG_RTCK NC
Dynamic Clock Sync
2.4.3 One-Wire / I2C
The SoM-200 specification calls for a two-wire I2C port. The SoM-A5D36 does not have a native hardware
One-
Wire port but does provide general purpose lines that can be used in this capacity when “bit - banged”.
Both Linux and CE provide this functionality.
Table 3: One-Wire / I2C Port
SODIMM
Pin#
SoM
Pin Name
Processor
Pin Name(s)
Port Line Description
29 I2CCLK TWCK0
PA31 Clock Pin
30 I2CDATA TWD0
PA30 Data Pin
There is an additional available I2C interface that is shared with the USB OTG pins. This additional port
can be utilized on a custom carrier board.
Table 4: Additional I2C Port
SODIMM
Pin#
SoM
Pin Name
Processor
Pin Name(s)
Port Line Description
10 USB_OTG_VBUS TWCK1
PC27 Clock Pin
40 USB_OTG_ID TWD1
PC26 Data Pin