Forum Discussion

Occasional Contributor

4 years ago

ALTPLL For Multiple Input Frequencies

A design has a requirement for processing one of 65,536 different input frequencies. Using the ALTPLL megafunction by itself requires specifying just one input frequency. Reconfiguring the ALTPLL wi...

EngWei_O_Intel

Frequent Contributor

4 years ago

Yes you are right. The minimum freq for PLL refclk in Cyclone III device is 5MHz.

There are methods for PLL reconfiguration:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an507.pdf

Thanks.

Eng Wei

BigSid

Occasional Contributor

4 years ago

Design Example 1 in AN507 shows the PLL being reconfigured with one of three .mif files used to select output frequency. Is there a way - other than manually generating 65,536 .mif files - to achieve what I'm looking to do? Thanks.

Forum Discussion

ALTPLL For Multiple Input Frequencies

Recent Discussions

Bidirectional pin USB_RX with a pseudo-differential I/O standard must use the OEIN port of the node

Obsolescence issues

Avalon-ST configuration with Agilex 3 fails

Cyclone IV E – PLL Power Track Width Recommendation Clarification

JTAG Chain Broken on Agilex 7-I Dev Kit