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66AK2G02: USBi_XO Clock

miki
Intellectual 280 points

Part Number: 66AK2G02

I use the USB function, do I need to supply the clock to the "USB0_XO","USB1_XO" pin?
By the way, connect a 24 MHz crystal resonator to SYSOSC_IN / SYSOSC_OUT and operate it.
  · Looking at Fig 11-1451 and Fig 11-1452 of TRM (SPRUHY 8F), is USBi_XO separate from CLKCORE?
  · When looking at DS (SPRS 932E), "USB0 _ XO","USB1_ XO" is described as "optional".

Also, with USB Boot, what clock is XI / XO of REF_SRC (bit 12: 11)?

  • 0
    TI__Guru**** 161600 points
    Hi,

    I am looking into this. I will post my findings here.

    Best Regards,
    Yordan
  • 0
    TI__Guru**** 161600 points
    Hi,

    I use the USB function, do I need to supply the clock to the "USB0_XO","USB1_XO" pin?

    Those are optional USB0/USB1 PHY reference clock input, you are not obligated to supply those.
    is USBi_XO separate from CLKCORE?

    Yes it is. You can use USBi_XO, if you've disabled IEP/NSS PLL or UART_PLL.

    Also, with USB Boot, what clock is XI / XO of REF_SRC (bit 12: 11)?

    Depending on the setting of the sysboot pins (bit 12:11), it could be as follows:
    • 0x0 = Crystal connected to XI/XO pins
    • 0x1 = External clock connected to XO pin
    • 0x2 = Internal clock

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Intellectual 280 points

    Sorry ,

    About the following question

    >Also, with USB Boot, what clock is XI / XO of REF_SRC (bit 12: 11)?

    >• 0x0 = Crystal connected to XI/XO pins
    >• 0x1 = External clock connected to XO pin
    >• 0x2 = Internal clock

     Which pin is the "XI/XO pins" of  "• 0x0 = Crystal connected to XI/XO pins"?

    ("XO pin" is "USB0_XO (BALL NUMBER=D19):","USB1_XO (BALL NUMBER=C20) ?)