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Chapter 3: Design Rules and Procedures
3–29
Making Quartus II Assignments to Block Entity Names
For example, you may want to make a Preserve Registers assignment to the Delay
blocks in Figure 3–25 to prevent them from merging.
Figure 3–25. Entity Name Assignment Example
Using the Quartus II Assignment Editor and Node Finder tools, you can identify the
names of the registers and make the assignments to them. For example, if your model
is my_model , the names may be:
my_model_GN:auto_inst|alt_dspbuilder_delay_GNLVAGVO3B:Delay|alt_dsp
builder_SDelay:Delay1i|DelayLine
my_model_GN:auto_inst|alt_dspbuilder_delay_GNLVAGVO3B:Delay1|alt_ds
pbuilder_SDelay:Delay1i|DelayLine
These assignments prevent merging of the registers. If you change the length of the
delay, the assignments are no longer valid. However, you can edit the To field of the
assignment and use a regular expression that is still valid if the entity name changes
due to a parameter change: Replace the eight alphanumeric characters following the
GN in the block entity name with .{8} , which is a regular expression that matches any
eight characters. The targets of the assignments then become:
my_model_GN:auto_inst|alt_dspbuilder_delay_GN.{8}:Delay|alt_dspbuil
der_SDelay:Delay1i|DelayLine
my_model_GN:auto_inst|alt_dspbuilder_delay_GN.{8}:Delay1|alt_dspbui
lder_SDelay:Delay1i|DelayLine
If you want the assignment to apply to the whole block, not just the specific nodes,
you can use the following code:
my_model_GN:auto_inst|alt_dspbuilder_delay_GN.{8}:Delay
my_model_GN:auto_inst|alt_dspbuilder_delay_GN.{8}:Delay1
Figure 3–26 shows this example in the Quartus II Assignment Editor.
Figure 3–26. Preserve Registers Assignment in the Quartus II Assignment Editor
November 2013
Altera Corporation
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
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