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66AK2E05: VCNTL signals active time

Tarang Jindal68
Intellectual 820 points

Part Number: 66AK2E05

Hello, 

As per the hardware design guide of K2E device, 

The VID values is driven out using all VCNTL pins once the POR is released. but according to device manual, the configuration pins are sampled at nResetfull de-assertion.

The AVSIFSEL are also the configuration pins which sampled at nRESETFULL de-assertion. AVSIFSEL decides that which AVS interface mode is selected.

so, how device provides VID values on VCNTL pins immediate after POR is released. (As it is also mentioned that nRESETFULL should be de-asserted after POR de-assertion.

is my understanding regarding VID value generation sequence is correct? If not, please let me know that at what instant (after power up or nReset or nPOR or nRESETFULL )  device provides the VID values on VCNTL pins.

if SoC provides VID values after nPOR then how device knows that which AVS mode is selected ?

Thanks and Regards

Tarang Jindal  

  • 0
    TI__Guru 65405 points
    Hi Tarang Jindal,

    I've forwarded this to the design team. Their feedback should be posted here.

    BR
    Tsvetolin Shulev
  • 0
    TI__Mastermind 42545 points
    Hi Tarang,
    The VID value is provided on the VCNTL pins after PORz is released but not immediately after PORz is released. The device must got through some initial configuration before the value is driven out. In actuality, the VID will not be provided until some time after RESETFULLz is released. That time is not specified since it varies depending on the boot mode selected. The power supply circuit should be designed to accept the VID value at any time.
    Regards,
    Bill