XIO2001: What is the clock frequency of CLKOUT0~6?

Kazuya Nakai59

Guru 21575 points

Part Number: XIO2001

Hello guys,

One of my customers is considering using XIO2001ZGU for their next products.

They have the following question at the moment. Could you please give me your reply?

Q. What is the clock frequency of CLKOUT0~6?

We couldn't find the number in the device datasheet, ver SCPS2112J.

Your reply would be much appreciated.

Best regards,

Kazuya.

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 316780 points

The frequency is 25 MHz, 33 MHz, 50 MHz, or 66 MHz, depending on the state of the M66EN and PCLK66_SEL pins. Also see figure 9-2 in section 9.2.1.2.1.

0 Kazuya Nakai59 over 4 years ago in reply to Clemens Ladisch

Guru 21575 points

Hello Clemens,

Thank you very much for your reply.

Which page is figure 25 shown on?

Thank you again and best regards,

Kazuya.

0 Clemens Ladisch over 4 years ago in reply to Kazuya Nakai59

Guru 316780 points

Sorry, I was using an older datasheet revision; it's now 9-2.

0 Kazuya Nakai59 over 4 years ago in reply to Clemens Ladisch

Guru 21575 points

Hello Clemens,

Thank you very much for your reply.

Could I ask you an additional question as the follow?

When 33MHz is selected, what is the exact frequency of CLKOUTn signal?

Is it 33.000MHz? Or is it 33.333MHz?

Your reply would be much appreciated.

Thank you again and best regards,

Kazuya.

0 Clemens Ladisch over 4 years ago in reply to Kazuya Nakai59

Guru 316780 points

I do not know.

The PCI specification requires the cycle time to be at last 30 ns, which corresponds to 33.333 MHz. But this is the minimum, so I'd expect the nominal frequency to be a little bit lower.

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XIO2001: What is the clock frequency of CLKOUT0~6?