AM62L: BOOT MODE SWITCHES

JUNZHI LIN

Part Number: AM62L

Tool/software:

hello!

"Boot from eFuse can be configured using the reduced pin count bootmode configuration" does this mean that when only using BOOTMODE[15:12], the VPP must be powered on to enable the SoC eFUSE?

9 months ago

0 Nihar Potturu 9 months ago

TI__Mastermind 24726 points

Hello,

The concerned expert is currently out of office. Please expect a delay in response.

Regards,

Nihar Potturu.

0 Stanislav Stilyanov 9 months ago in reply to Nihar Potturu

TI__Mastermind 23620 points

Hi Junzhi,

Vpp stands for Programming Voltage and it is only needed during eFuse programming. During the remaining time, including boot time, it may stay unpowered.

Please take a look at section VPP Specifications for One-Time Programmable (OTP) eFuses
in the device datasheet: https://www.ti.com/lit/gpn/am62l for details on how to program eFuses.

Please let me know if this answers your question.

Regards,

Stan

0 JUNZHI LIN 9 months ago in reply to Stanislav Stilyanov

Prodigy 150 points

Is the eFuse marked in yellow here related to One-Time Programmable (OTP) eFuses?

0 Stanislav Stilyanov 9 months ago in reply to JUNZHI LIN

TI__Mastermind 23620 points

Yes, correct.

Boot From eFuse means users can make their custom boot sequence (primary and backup peripheral to boot from). This may be required in case they want to use the reduced BOOTMODE pin set and the fixed sequences in BOOTMODE Pin Mapping (Reduced) in https://www.ti.com/lit/pdf/sprujb4 do not fit their needs.

Regards,

Stan

0 Kallikuppa Sreenivasa 8 months ago in reply to Stanislav Stilyanov

TI__Guru**** 211040 points

Hello Junzhi,

The note in the schematics near to the VPP supply pin will be updated as below:

D-Note :-
Connecting 1.8V supply source directly to VPP continuously is not recommended or allowed

The VPP supply is required only to program the eFuse.

This allows use of a on-board VPP supply or an external supply during eFuse programming.

Please refer to the below FAQ

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1220816/faq-am625-am623-custom-board-hardware-design-queries-regarding-vpp-efuse-programming-power-supply-selection-and-application

Regards,

Sreenivasa

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AM62L: BOOT MODE SWITCHES