accuracy of CCM_CLK2 in i.MX6SoloX

[ko-hey]

Hi all

Is there any spec of CCM_CLK2 in i.MX6SoloX ?

I plan to use it for ENET2_TX_CLK, ENET2_RX_CLK and TX, RX clock for Mii of external device.

I concerned about  whether the CCM_CLK2 output can satisfy accuracy that is mentioned in 4.12.6.1.1 of IMX6SXAEC.

Here is a description in 4.12.6.1.1 of IMX6SXAEC.

The receiver functions correctly up to an ENET_RX_CLK maximum frequency of 25 MHz + 1%. There
is no minimum frequency requirement. Additionally, the processor clock frequency must exceed twice the
ENET_RX_CLK frequency.

Can I use CCM_CLK2 for ENET2_TX_CLK, ENET2_RX_CLK and TX, RX clock for Mii of external device ?

Ko-hey

[Yuri · Accepted solution]

Hello,

  Accuracy of the i.MX6 output clock is affected by parameters of internal PLLs, which, strictly speaking,

are not specified. In particular, we can refer to Table 2-16 (24 MHz crystal tolerance guidelines) of Hardware

Development Guide for i.MX 6SX, assuming stability (thermal, voltage and other) of PLL output clock is fully

defined by external crystal / oscillator, and i.MX6 meets USB, PCIe, Ethernet clock specs.

http://cache.nxp.com/files/32bit/doc/user_guide/IMX6SXHDG.pdf

Have a great day,

Yuri

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