(Q1) Required queries about IMX6 ultra lite processor and its Errata. Need help for clarification

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(Q1) Required queries about IMX6 ultra lite processor and its Errata. Need help for clarification

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ramesh6663
Contributor III

Crystal/Oscillator (24Mhz) queries:

  • The below schematics captured from NXP reference design, it’s followed two difference clock circuits.
    a)24 crystal (Y501)
    b)24 MHz clock(Y503)

1.Do we really required crystal as well as oscillator to make processor work?
2.Why we need two different clock circuit and logical connection in design?
3.Is PMIC_STBY_REQ signal will used to make Processor Standby while pulling the MOSFET line to ground?

Q1.png

We are looking cost effective solution for our design, so we prefer 24MHz crystal along with 16PF load caps only. Is this work for new silicon version 1.1 processor chip? Please refer our design snapshot below,

Figure1:

Q2.png

We would like use simple crystal without affecting functionality. 

Could you please validate this design?

We have seen in NXP community, they posted that there was some errata issue (ERR009455).

Link: http://www.nxp.com/assets/documents/data/en/errata/IMX6ULCE.pdf

Thanks in Advance

Ramesh

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igorpadykov
NXP Employee
NXP Employee

Hi Ramesh

1.

pastedImage_1.jpg

2. please refer to sect.18.5.1.1 External Low Frequency Clock - CKIL,

18.5.1.2 External High Frequency Clock - CKIH and internal oscillator

i.MX6UL Reference Manual

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6ULRM.pdf

3. PMIC_STBY_REQ is i.MX6UL output signal which is used in low power modes,

optionally (as in EVK schematic) it can be used to turn off 24MHz clock (using mosfet)

to further reduce power consumption)

Best regards
igor
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ramesh6663
Contributor III

Hi Igor,

 Thanks for your quick reply. Could you please check our 24MHz Xtal connection?

  Because we have seen the Errata ERR009455 mentioned some modification required for 24MHz crystal connections.

  The newly released silicon version will solve this problem. Is there any schematic done for Newly released IMX6UL silicon version?

Thanks & Regards,

Rameshkumar

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igorpadykov
NXP Employee
NXP Employee

Hi Rameshkumar

I think schematic ic correct, ERR009455 is fixed in rev.1.1.

Best regards
igor

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