FlexSPI supported serial clock frequencies in i.MX 8X processor

[syuriks]

Hello,

I need clarification regarding FlexSPI supported serial clock frequencies in i.MX 8X processor. As far as I could understand FlexSPI clock serialClkFreq is configured by ROM and its frequencies vary from 20 to 200 MHz.

The question is whether serialClkFreq and flexspi0_ipg_clk_sfck/flexspi1_ipg_clk_sfck is the same clock? Based on MCR0 register serial root clock can be divided maximum by 8. Does it mean that the minimum supported frequency is 2.5MHz?

Thanks,

Yuri

[igorpadykov]

Hi Yuri

supported frequencies are described in i.MX8QXP Datasheet

sect.4.10.12 FlexSPI timing parameters:
The FlexSPI interface can work in SDR or DDR modes. It can operate

up to 60 MHz at 3.3 V, 166 MHz at 1.8 V SDR mode

https://www.nxp.com/docs/en/data-sheet/IMX8QXPAEC.pdf

There is no min.frequency limit, as for "2.5MHz" - one can consider

various parents clocks with dividers in Chapter 8 Clocking i.MX8DQXP Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMX8DQXPRM.pdf

Best regards
igor
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