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==Introduction==
When used in combinaton with [[:Category:Diva|Diva SOM]], DACU requires the use of [[DivaEVB-Lite]] acting as adaptation board. The overall system looks like the following picture and it is composed by
* Diva SOM
* DivaEVB-Lite
* DACU.
TBD
In order to make DACU compatible with this configuration, some additional wired connections are required, as detailed in the [[Dacu#Schematics|schematics]]. Following sections explains in more detail these issues.
==Power supply==
This is the power-up sequence of the whole system (it matches [[Hardware_Manual_%28Diva%29#Power.2C_reset_and_control|Diva recommended power-up sequence]]):
# power supply or wall adapter connected to DACU's JP2 is turned on
# DACU's U15 DC/DC PSU is turned on; since the output of this DC/DC is connected to DivaEVB-Lite's VREG rail, Diva SOM is powered
# Diva performs its own power-on sequence
# DivaEVB-Lite's U4 linear regulator is enabled by Diva
# DivaEVB-Lite's 3.3V rail raises; since this rail is connected to DACU's ENA_3.3V, DACU's U16 DC/DC PSU is enabled and DACU's circuitry interfacing processor's I/O is powered
==DACU's USB host port==
DACU's USB host port power is controlled by Micrel MIC2026 Dual-Channel Power Distribution Switch (U7). B channel of this swith is associated to USB host port. In order to control this channel, Diva's USB1_DRVVBUS and VUSB_VBUS1 signals are connected to ENB and FLGB pads respectively.
