UCD3138064ARGCR.A datasheet(59/84 Pages) TI2

59 / 84 page

Does Program Flash 1 have a

BRANCH instruction at the

beginning?

Is there a valid checksum on the

first 2 kB of Program Flash 1 or all

32 kB of Program Flash 1?

BRANCH to

Program Flash 1

Does Program Flash 2 have a

BRANCH instruction at the

beginning?

Is there a valid checksum on the

first 2 kB of Program Flash 2 or all

32 kB of Program Flash 2?

BRANCH to

Program Flash 2

Stay in ROM

Yes

Device Reset

Yes

Is there a valid

checksum on all 64 kB?

UCD3138064A

www.ti.com

SLUSCA5B – DECEMBER 2015 – REVISED JANUARY 2017

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Product Folder Links: UCD3138064A

Detailed Description

Figure 6-32. Check Sum Evaluation Flowchart

If neither checksum is valid, the Boot ROM stays in control, and accepts commands via the PMBus

interface. These functions can be used to read and write to all memory locations in the UCD3138064A.

Typically they are used to download a program to Program Flash, and to command its execution.

6.6.1.3

Customer Boot Program

As described above, it is possible to generate a user boot program using 2 kB or more of the Program

Flash. This can support things which the Boot ROM does not support, including:

•

Program download via UART – useful especially for applications where the UCD3138064A is isolated

from the host (e.g., PFC)

•

Encrypted download – useful for code security in field updates.

•

PMBus download at different addresses

6.6.1.4

Flash Management

The UCD3138064A offers a variety of features providing for easy prototyping and easy flash

programming. At the same time, high levels of security are possible for production code, even with field

updates. Standard firmware will be provided for storing multiple copies of system parameters in data flash.

This minimizes the risk of losing information if data-flash programming is interrupted.

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