D i d o H a r d w a r e M a n u a l
v . 1 . 0 . 5
●
PORn input (Power-on Reset) of DM8148 processor
●
output of voltage monitor (see Section 5.4)
●
NRESPWRON2 output of PMIC.
Internal pullup is 10kOhm.
5.3.3
RSTOUTn (J2.91)
This output signal is asserted by DM8148 processor until it
gets out of reset. It is usually used to reset external memories
and peripherals connected to processor. It is connected to:
●
RSTOUT_WD_OUTn pad of DM8148 processor
●
2k2 pull down resistor
●
peripherals and memories.
In case it is used to reset devices on carrier board, its driving
capability has to be taken into account.
5.3.4
CPU_RESETn (J2.15)
This input signal acts as External Warm Reset. It is connected
to processor's RESETn pad. Internal pullup is 2.2kOhm.
5.3.5
JTAG_TRSTn (J2.100)
This input signal acts as Emulation Warm Reset. It is connected
to processor's TRSTn pad. Internal pulldown is 4.7kOhm
5.4
Voltage monitor
DIDO SOM is equipped with a multiple-input voltage monitor
whose reset output is connected to PORSTn. Monitored voltage
rails include 3.3V provided by carrier board.
5.5
Boot options
Thanks to the versatility of internal BootROM,
DM814x/AM387x processors provide a rich set of boot options
and different configurations selectable via BTMODE[15:0]
bootstrap pins. For a detailed explanation on the boot process
for DM814x/AM387x processors, please refer to the Technical
Reference Manual (available from TI website) at section ROM
August, 2014
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