About reboot of P1010 CPU

[masaakiuno]

Hallo

When rebooting P1010, hardware carries out the following.

1.P1010 asserts a HRESET_REQ signal.

2.If HRESET_REQ is asserted, HRESET_B will be asserted in a circuit and the signal will be inputted to P1010.

3.If a HRESET_B signal is asserted, P1010 will negate a HRESET_REQ signal.
It is above.

However, there was a case where it did not operate normally after reboot even if it performs the above.

I attach the file which showed timing.

I think that there is the cause when HRESET_B is asserted immediately, after HRESET_REQ is asserted.
Although regulation of the timing of a HRESET_REQ signal and HRESET_B considers not being written to a datasheet by it, is it right?
Are there any other factors?

Best Regards,

Masaaki

[yipingwang]

Hello Masaaki,

It seems that the attached document is empty.

Please refer to "Table 6. RESET initialization timing specifications" in "P1010 QorIQ Integrated Processor Hardware Specifications" from https://cache.freescale.com/secured/32bit/doc/data_sheet/P1010EC.pdf?__gda__=1409650708_96792ca92d95....

Please ensure that duration of the HRESET assertion initiated by the HRESET_REQ is not less than 600 us. Please note that HRESET_REQ is deasserted within two SYSCLKs after HRESET assertion, so for appropriate reset timing it shouldn't be directly connected to HRESET.

Have a great day,
Yiping

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[masaakiuno]

Dear Yiping Wang,

Couldn't the attached file be seen?

The attached file becomes a picture which is downward.

The pulse width of HRESET_B is secured 600μs or more.

Not having worked is a case where HRESET_B is asserted immediately, after HRESET_REQ is asserted.

Although I thought that I would not work if HRESET_B is immediately asserted after HRESET_REQ is asserted, how am I?

Best Regards,

Masaaki.Uno

[yipingwang]

Hello Masaaki Uno,

HRESET_REQ will  be deasserted immediately after the HRESET assertion, there should be a duration time for HRESET_REQ. HRESET delay after HRESET_REQ assertion is not described in the specification, but system reset logic may postpone HRESET assertion.

Have a great day,
Yiping

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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