LayerscapeのトピックRe: How can the LS1012A RDB use a crystal and have SATA enabled at the same time?

How can the LS1012A RDB use a crystal and have SATA enabled at the same time?

kennetholsen — Thu, 05 Apr 2018 13:08:01 GMT

I’m currently investigating if the LS1012A could be used for my next design.

While reading the QorIQ LS1012A Reference Manual, I found that (as I understand it) you can’t use a crystal as the main clock, if SATA is enabled. However when I look at the LS1012A RDB reference design board, it uses a 25MHz crystal and has a SATA connector, and Thus I would assume SATA can be enabled on the board?.

What am I missing?

From LS1012A Reference Manual:

“4.4.6.2.4 SATA use cases

For the systems with a SATA interface, an external clock oscillator/generator is required,

as shown in the figure below:

Figure 4-10. SATA clocking

Crystal cannot be used when SATA is enabled on the chip."

Re: How can the LS1012A RDB use a crystal and have SATA enabled at the same time?

alexander_yakov — Mon, 09 Apr 2018 13:27:18 GMT

It looks like you have old revision board.

RDB board uses onboard oscillator with clock buffer starting from revision CX1 of the schematic.

Have a great day,
Alexander
TIC

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Re: How can the LS1012A RDB use a crystal and have SATA enabled at the same time?

kennetholsen — Mon, 09 Apr 2018 13:34:06 GMT

You are correct, I had downloaded the REV-C version and not seen that a REV-D was also available.

Thank you!.

Kenneth