UG-1926
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PROGRAMMABLE LOGIC ARRAY (PLA) TOOL
integrates a PLA that consists of two
independent but interconnected PLA blocks. Each block
consists of 16 elements, giving a total of 32 elements, from
Element 0 to Element 31. The PLA tool is a graphical tool that
allows easy configuration of the PLA. The PLA tool can be
found on the ADuCM420 installer, under the
Tools
folder. With
the PLA tool, the correct output value is determined after all the
options from the tool is properly selected.
CONFIGURING THE GATES AND OUTPUT
Each PLA element contains a two-input lookup table that can
be configured to generate logic output function based on the
two inputs and flip flop in the PLA, as shown in Figure 39. Each
PLA element in a block can be connected to other elements in
the same block by configuring the output of Mux 0 and Mux 1.
The user can select respective inputs that correspond to the
PLA_ELEMx register bits. See the
for a complete list of possible connections for
the element GPIO input/output, and for the lookup table
configuration in the PLA.
After the inputs are selected from the GUI, ensure that the
BLOCK
,
ELEMENT
, and
LOOK UP TABLE
options are
selected in the top right portion of the tool. Click the
ENTER
button to generate the output of PLA (see Figure 39).
25
84
4
-12
1
Figure 39. Programmable Logic Array Tool
I
2
C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).
ESD Caution
ESD (electrostatic discharge) sensitive device
. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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