UCD3138128 datasheet(55/80 Pages) TI

55 / 80 page

Does PFLASH 0 have a

BRANCH instruction at the

beginning?

Is there a valid checksum on

the first 2 kB of PFLASH 0,

all 32 kB of PFLASH 0,

all 64 kB of PFLASH 0 & 1

or 128 kB of PFLASH 0, 1, 2 and 3?

BRANCH to

Program Flash 0

Stay in ROM

Yes

Device Reset

BRANCH to

Program Flash 2

Yes

Does PFLASH 2 have a

BRANCH instruction at the

beginning?

Is there a valid checksum on

all 64 kB of PFLASH 2 &3?

UCD3138128, UCD3138A64

www.ti.com

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

Figure 36. Check Sum Evaluation Flowchart, 128 kB

If none of the checksums are 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 device. Typically they are

at address 11 and are used to download a program to Program Flash, and to command its execution.

9.5.3 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 UCD3138A64 or UCD3138128 is

isolated from the host (e.g., PFC)

•

Encrypted download – useful for code security in field updates.

•

PMBus download at different addresses

•

Different command formats

9.5.4 Flash Management

The device 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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