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? Care should be taken when interfaces. The same GPIO signal and to
WVGA/LCD EI3 Extender Board Hardware Reference
Software-Controlled Switches
(SoftConfig)
On the WVGA/LCD EI3 Extender Board, all of the traditional mechani-
cal switches and jumpers have been replaced by I 2 C software-controlled
switches. Refer to any SoftConfig*.c file found in the installation direc-
tory of CCES for an example of how to set up the SoftConfig features of
the product through software.
The SoftConfig section of this manual serves as a reference to any user
that intends to modify an existing software example. If software provided
by ADI is used, there should be little need to reference this section.
changing SoftConfig settings not
create a conflict between
SPICS should not be configured for more than one interface.
Overview of SoftConfig
In order to further clarify the use of electronic single FET switches and
multi-channel bus switches, an example of each is illustrated and com-
pared to a traditional mechanical switching solution. This is a generic
example. After the generic discussion, there is a detailed explanation of the
SoftConfig interface specific to the extender board.
Figure 2-2 shows two individual FET switches (Pericom PI3A125CEX)
with reference designators UA and UB . Net names ENABLE_A and ENABLE_B
control UA and UB . In this example, the default FET switch enable settings
are controlled by resistors RA and RB which pull the enable pin 1 of UA and
UB to ground (low). In a real example, these enable signals are controlled
by the Microchip IO expander. The default pull-down resistors connects
the signals EXAMPLE_SIGNAL_A and EXAMPLE_SIGNAL_B and also connects
signals EXAMPLE_SIGNAL_C and EXAMPLE_SIGNAL_D . To disconnect
EXAMPLE_SIGNAL_A from EXAMPLE_SIGNAL_B , the Microchip IO expander is
WVGA/LCD EI3 Extender Board Manual
2-3
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