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Original question:

AM5718: Purpose of SYS_CLKIN2

AM5718: SYS_CLKIN2 Purpose

Tavi
Intellectual 410 points
Part Number: AM5718

Hello,

I have a custom AM5718 board with both OSC0 (for SYS_CLKIN1) and OSC1 (for SYS_CLKIN2) populated, similar to  AM57x8 EVM.

I want to remove OSC1 in the next revision since it's listed as optional in the datasheet, so I tried disabling it, and, as far as I can tell, everything still works.

Is there a reason why OSC1(SYS_CLKIN2) would be needed?

I found an answer to a similar question pointing to chapter 3 of the TRM. I looked there and OSC1 is listed as optional, but I could not find any mention of a case where OSC1 is needed.

In other words, is there any functionality which requires OSC1/SYS_CLKIN2?

Thank you,

--Tavi

  • 0
    TI__Guru**** 170625 points

    Hi Tavi,

    SYS_CLKIN2 can be used if you need some other frequency than the frequency provided by the SYS_CLKIN1. SYS_CLK2 is the other main clock source of the device. It can be supplied as a reference clock to the DPLLs and as functional clock to several modules. See Figure 3-33. PRM Clock Manager Overview in AM57xx TRM. Also do a search of SYS_CLK2 throughout Chapter 3 Power, Reset, and Clock Management in AM57xx TRM and you will find all needed information about SYS_CLK2.

    One possible usage of SYS_CLKIN2 is for the McASP audio interface.

    Check below e2e threads for more info:

    Regards,
    Pavel