Overview Of Softconfig - Analog Devices ADSP-SC573 EZ-KIT Manual

the board 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.
NOTE: Care should be taken when changing SoftConfig settings not to create a conflict with interfaces. This is
especially true when connecting extender cards.

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 compared to a traditional mechanical switching solution. This is a generic example that uses
similar FET and bus switch components that are on the board.
After this generic discussion there is a detailed explanation of the SoftConfig interface specific to the ADSP-SC573
EZ-KIT .
The Example of Individual FET Switches figure shows two individual FET switches (Pericom PI3A125CEX) with
reference designators
enable settings in this example are controlled by resistors
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_C
EXAMPLE_SIGNAL_B
interfaces with the Microchip. The same procedure for
EXAMPLE_SIGNAL_D
Figure 3-2: Example of Individual FET Switches
®
ADSP-SC573 EZ-KIT Manual
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and . Net names
UA UB ENABLE_A
EXAMPLE_SIGNAL_A
and
EXAMPLE_SIGNAL_D
, the Microchip IO expander is used to change
.
and control
ENABLE_B
and which pull the enable pin 1 of
RA RB
and
EXAMPLE_SIGNAL_B
. To disconnect
EXAMPLE_SIGNAL_A
ENABLE_A
disconnects
ENABLE_B
Software-Controlled Switches (SoftConfig)
and . The default FET switch
UA UB
and
UA
and also connects signals
from
to a logic 1 through software that
from
EXAMPLE_SIGNAL_C
to
UB
3–3