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Altera_Forum
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12 years ago

HPS clock peripherals, specifically CAN

How do I determine the clock frequency of the HPS peripherals and edit them? In particular the CAN controller clock, can_clk. And I guess also, l4_sp_clk, since the CAN controller uses both these clo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

In the preloader generator tools you would specify what the clock frequency is and pick what you want for the CAN and L4 SP clock frequencies to be. It should then create the correct PLL initialization code to program the peripheral PLL in the clock manager to match what you asked for. The peripheral PLL can use EOSC1 or EOSC2 as clock source pins or even clocks driven in by the FPGA fabric, most people use EOSC1 though.