Raisonance REva User manual - page 9
REva User Guide v3
3. REva motherboard
3.2 Daughter board connection
The REva motherboard cannot be used without a daughter board. This area can
connect to a daughter board featuring a target microcontroller for evaluation.
This area may also be used to connect the REva to another board with the
appropriate connectors soldered to the bottom.
3.2.1 Features
●
A standard SO-DIMM connector to receive the daughter board. The
procedure of insertion/extraction is described in chapter 3.2 Daughter
Boards.
●
A 72-position header for observation and measuring of useful signals.
●
Two 40-position headers to which the other 72 positions of the SO-DIMM
are connected, as well as some VDD and GND positions. This is useful for
obtaining multiple power supply signals when connecting the REva to
another board.
3.2.2 Limitations
The SO-DIMM connector is guaranteed for 20 insertion-extraction cycles (more
in practice...).
3.3 ISP/ISD connection area
This area allows the connection of an external RLink (RLink-PRO) when the
signals from the embedded RLink are disconnected.
The 24 pin connector can also be used to make the embedding RLink able to
drive an external target board.
3.4 Reset area
This area resets the devices on the daughter board.
3.4.1 Features
●
1 push-button with a negative polarity.
●
1 RC debouncing filter with a time constant of 330 us (soldered on the
bottom side of the board).
3.4.2 Limitations
Microcontrollers using a positive reset signal require an inverter embedded on
the daughter board.
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