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Honored Contributor

9 years ago

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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Honored Contributor

9 years ago

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