
A–3
Clear Box Generator Options
© February 2012 Altera Corporation ALTDLL and ALTDQ_DQS Megafunctions User Guide
Figure A–3 shows a sample text file used for the clear box generator.
With the text file, you can generate output files using the following command:
clearbox altdq_dqs.dll –f sample_param_test.txt
After the output files are generated, you can instantiate the megafunction module into
either a HDL file or a block diagram file in the Quartus II software.
To determine the resource usage for a particular configuration in the ALTDQ_DQS
megafunction, type the following command:
clearbox altdq_dqs.dll -f sample_param_test.txt -resc_count
Clear Box Parameters
Table A–1 lists the Clear Box parameters for the ALTDLL megafunction.
Figure A–3. Sample Text File for Clear Box Generator
Table A–1. ALTDLL Megafunction Parameters (Part 1 of 3)
Parameter Name Type Required Description
DELAY_BUFFER_MODE String No Determines whether the DLL delay buffers are working in
low-frequency mode or high-frequency mode. Available
values are LOW and HIGH. The default value is LOW.
DELAY_CHAIN_LENGTH Integer No This parameter represents the number of delay buffers in the
delay loop. The available values are 6, 8, 10, 12, and 16.
This parameter defaults to 12.
DLL_OFFSET_CTRL_A_
STATIC_OFFSET
String No This is a Gray-coded signed integer expressed as a string
with a range from –63 to 63. If the
DLL_OFFSET_CTRL_A_USE_OFFSET parameter is set
to FALSE, the value is added to the DLL delay-setting value
and appears as output on the
dll_offset_ctrl_a_offsetctrlout[5..0]
output bus. If the DLL_OFFSET_CTRL_A_USE_OFFSET
parameter is set to TRUE, ignore this value. The default
value is 0.
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