Altera Interlaken MegaCore Function - Manual (Page 19)

Chapter 2: Getting Started 2–7
Specifying Constraints
June 2012 Altera Corporation Interlaken MegaCore Function
User Guide
Specifying Constraints
Altera provides a Synopsys Design Constraints (.sdc) file that you must apply to
ensure that the Interlaken MegaCore function meets design timing requirements. The
script automatically constrains the system clocks and the reference clock based on the
data rate you specify. If your design includes multiple instances of the Interlaken
MegaCore function, you must edit the .sdc file to ensure that each instance name
appears correctly in the file.
The Quartus II software v12.0 requires that you add the following additional
constraints manually:
■ Hard PLL Assignment Constraints
■ I/O Standard Constraints
The following sections describe the constraints you must add manually.
Hard PLL Assignment Constraints
The .sdc script provided with the Quartus II software v12.0 requires that you add
hard PLL assignment constraints to the Quartus Settings File (.qsf) before you
compile your design. You can add these constraints directly to the .qsf, or you can use
the Quartus II Assignment Editor.
You must add the following hard transceiver PLL assignments before compilation:
set_location_assignment IOBANK_<quad_location> -to <PLL_path>
where
■ <quad_location> is any valid quad location on your device. It may be any of QLn
or QRn, for n in {0,1,2,3}, depending on the device
■ <PLL_path> is "*|lt_ntrlkn_hsio_bank_*:alt_ilk_hsio_bank_<n>|*|tx_pll*0"
for any valid high-speed I/O (HSIO) bank number <n>
The valid HSIO bank numbers depend on the number of lanes in your Interlaken
MegaCore function variation.
Table 2–1 shows the valid HSIO bank numbers.
To add the constraint using the Assignment Editor, perform the following steps:
1. Open your Quartus II project in the Quartus II software.
2. On the Processing menu, point to Start and click Start Analysis & Elaboration.
The analysis and elaboration process might take several minutes to complete.
Table 2–1. Valid HSIO Bank Numbers Depending on Number of Lanes
Number of Lanes
Valid HSIO Bank Numbers
0 1 2 3
4 v — — —
8 v v — —
10 v v — —
12 v v v —
20 v v v v