Hi Takashi
XTALI and RTC_XTALI (Clock Inputs) DC Parameters are given in
Table 22. XTALI and RTC_XTALI DC Parameters i.MX6SDL Datasheet (rev.5, 6/2015)
http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SDLCEC.pdf
If crystal is connected to these pins, then levels are undefined as its value is defined
by used crystal quality.
Best regards
igor
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