How to generate 8Mhz clock out from PLL in I.mx6ull processor

[prabhu1]

Hi,

Pls, Can you suggest how to generate 8Mhz clock output using PLL in i.mx6ull processor.

[prabhu1]

Hi Igorpadykov,

Other than CCM_CLKO1,2 any other PLL pin possibilities to generate 8MHz clock out.

In above image CCM_CLKO1,2 are connected JTAG pins(JTAG_TMS and JTAG_TDO) Since JTAG  pins N15 or P14 has been used for 8MHZ clock, will that be conflicting when we use JTAG. So any other pins for 8MHz clock generate.

[igorpadykov]

Hi prabhu

one can output "osc_clk" (24MHz dividing by3) on CCM_CLKO1,2 (look at sect.4.1.1 Muxing Options)

using CCM_CCOSR register described in sect.18.6.21 CCM Clock Output Source

Register (CCM_CCOSR) i.MX6ULL Reference Manual, configuring it in uboot.

https://www.nxp.com/webapp/Download?colCode=IMX6ULLRM 

Best regards
igor
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[prabhu1]

Hi Igorpadykov,

Thank you for your help!