
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
18. Analog Parameters Set Using QSF
Assignments
You specify the analog parameters using the Quartus II Assignment Editor, the Pin
Planner, or through the Quartus II Settings File (.qsf). The default values for analog
options fall into three categories:
■ Global— These parameters have default values that are independent of other
parameter settings.
■ Computed—These parameters have an initial default value that is recomputed
based on other parameter settings.
■ Proxy—These parameters have default values that are place holders. The
Quartus II software selects these initial default values based on your design;
however, Altera recommends that you replace these defaults with values that
match your board electrical specification.
Making QSF Assignments Using the Assignment Editor
The Quartus II software provides default values for analog parameters. You can
change the default values using the Assignment Editor. For example, complete the
following steps to specify a 3.0V supply for the VCCA voltage and a 1.0V supply to
the VCCR voltages.
1. On the Assignments menu, select Assignment Editor. The Assignment Editor
appears.
2. Complete the following steps for each pin requiring the VCCA voltage:
a. Double-click in the Assignment Name column and scroll to the bottom of the
available assignments.
b. Select VCCA_GXB Voltage.
c. In the Valu e column, select 3_0V from the list.
3. Complete the following steps for each pin requiring the VCCR voltage:
a. Double-click in the Assignment Name column and scroll to the bottom of the
available assignments.
b. Select VCCR_GXB/VCCT_GXB Voltage.
c. In the Valu e column, select 1_0V from the list.
The Quartus II software adds these instance assignments commands to the .qsf file for
your project.
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