UCD3138064RGCT datasheet(59/104 Pages) TI

59 / 104 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?

Figure 9-28. 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 UCD3138064. Typically they are

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

9.5.1.3 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 UCD3138064 is isolated from the

host (e.g., PFC)

• Encrypted download – useful for code security in field updates.

• PMBus download at different addresses

9.5.1.4 Flash Management

The UCD3138064 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.

9.5.1.5 Synchronous Rectifier MOSFET Ramp and IDE Calculation

The UCD3138064 has built in logic for optimizing the performance of the synchronous rectifier MOSFETs. This

comes in two forms:

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UCD3138064

SLUSB72D – MARCH 2013 – REVISED APRIL 2021

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