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Valued Contributor III
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ALTPLL vs ALTPLL_RECONFIG

Hi All, 

 

What's the difference between the ALTPLL and ALTPLL_RECONFIG? When to use each one?  

 

Thank you!
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Valued Contributor III
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Read through the "altpll_reconfig user guide (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/ug/ug_altpll_reconfig.pdf)". This IP allows you to reconfigure the PLL from the FPGA fabric, whilst it's operating. 

 

The ALT_PLL IP has a static configuration, determined when the FPGA is configured. See the "alt_pll user guide (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/ug/ug_altpll.pdf)" for comparison. 

 

When you might use each depends on your requirements. 

 

Cheers, 

Alex
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Valued Contributor III
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Thanks for your reply.  

 

After I added the ALTPLL to the project, how can I re-configure it (the IP was just instantiated to the Project without using the QSys)? 

 

Thank you!
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Valued Contributor III
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From within Quartus, open the Verilog or VHDL file that corresponds to the ALTPLL IP. That should open the IP editor (rather than the code in a text editor), allowing you to modify the settings. 

 

Cheers, 

Alex
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Valued Contributor III
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Thank you! It worked for me :-)  

 

Now, how can I simulate this IP, which was already instantiated to my RTL (I'm using the Altera Modelsim Starter simulator)? Should I need some special files to my project in order to simulate the IP?  

 

Here is a list of the files, which were generated from IP Catalog: 

alt_pll_bb.v 

alt_pll.bsf 

alt_pll_inst.v 

alt_pll.ppf 

alt_pll.qip 

alt_pll.v 

 

Thank you
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Valued Contributor III
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You need to compile the relevant Altera libraries before you can simulate one of the megafunctions - including ALTPLL. 

 

Enter the following lines to the Modelsim command line:vlib altera_mf_ver vmap altera_mf_ver altera_mf_ver vlog -work altera_mf_ver {QUARTUS_ROOT_DIR}/eda/sim_lib/altera_mf.v  

Replacing {QUARTUS_ROOT_DIR} with a route directory or environment variable. This will compile the library, dumping it to disk. So, you only need do this once (per library release). 

 

You'll then need to modify your vsim command to make it aware of your newly compiled library.vsim -L altera_mf_ver -t ps work.{top} 

Where {top} is your top level simulation entity. 

 

Cheers, 

Alex
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