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3-14
Designing with Programmable Logic
Node naming restrictions
Programmable logic node names must adhere to the following
naming conventions:
For a listing of DSL keywords,
refer to the DSL Reference in
PLSyn online help.
•
The first character must be alphabetic (a-z, or A-Z).
•
Remaining characters can be any combination of alphabetic
(a-z, A-Z), numeric (0-9), and underscore (_) characters.
•
Names cannot be any of the DSL keywords.
Node names are case-insensitive which means upper-case and
lower-case letters are treated alike.
Labeling interface nodes
For interface nodes, you can insure that the node label will
persist with the PLD implementation.
To force the label to appear in the back-annotated
PLD symbol
For more information, see Back
Annotating the Schematic on
page 2-9.
1
Attach a global port to the interface node, as shown in
Figure 3-6.
2
Label the global port.
Non-programmable
logic
Programmable
logic
Figure 3-6 Programmable Logic Interface Node Labeled with
a Global Port