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C6672 datasheet power sequencing

Wenjun Huang85261
Prodigy 150 points

p102-103:

t3: RESETSTATz is driven low once the DVDD18 supply is available. From Fig7-5,  the RESETSTATz is driven low from the start. Why is that so?

t4b: RESETFULLZ and RESETz may be driven high any time after DVDD18 is at a valid level. In a PORz-controlled boot both RESETFULLz and RESETz must be high before PORz is driven high. From Fig7-5, the RESETFULLz is driven high after PORz. Why is that so?

t6: Device initialization requires 500 SYSCLK1 periods after the power stabilization phase. When does device initialization starts? Is it at the start of arrow head t6? Device initialization starts when the clocks start toggling? Both the refclk and the DDRclk?

t7: RESETFULLz must be held low for at least 24 transitions of the SYSCLK1 after PORz has stabilized at a high level. t7 contradicts with t4b. Is it because Fig7-5 shows the case of not a PORz-controlled boot?

t8: What is a efuse farm and efuse farm scan?

t9 and t10: Is the t9 and t10 arrow heads correct? Shouldn't the arrow heads be before RESETFULLz starts to ramp and after RESETFULLz finishes ramping?

  • 0
    TI__Guru* 84110 points

    Wenjun Huang85261 said:
    p102-103:

    SPRS708A - this link returns the latest version of this document.

    Wenjun Huang85261 said:
    t3: RESETSTATz

    You do understand that no outputs are driven on the far left of the Figure when no power is applied to the device? Taken together, the figure and text help you to understand more about how the device will operate.

    Wenjun Huang85261 said:
    t4b: RESETFULLZ and RESETz

    Using both the figure and the table's text, you can see the choices you can make plus the requirements of the device. Requirements must be met, but some choices may be made. Further study of the other figures and tables and the other Keystone documents may help you learn more about those choices and their results.

    Wenjun Huang85261 said:
    t6: Device initialization

    The t6 text seems very clear. It states a requirement that must be met. The period starts when power is stable and clocks are running.

    Wenjun Huang85261 said:
    t7: RESETFULLz

    I do not know the answer.

    Wenjun Huang85261 said:
    t8: What is a efuse farm and efuse farm scan?

    These are internal mechanisms of the device. You may replace "efuse farm" with "internal logic". The device will operate as shown in the figure.

    Wenjun Huang85261 said:
    t9 and t10: Is the t9 and t10 arrow heads correct?

    Yes, they look correct to me. They are before and after RESETFULLz as you have asked.

    Regards,
    RandyP