UCD3138A64PFCR datasheet(56/84 Pages) TI2

56 / 84 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?

BRANCH to

Program Flash 0

Stay in ROM

Yes

Device Reset

UCD3138128, UCD3138A64

SLUSBZ8B – JUNE 2014 – REVISED FEBRUARY 2017

www.ti.com

Product Folder Links: UCD3138128 UCD3138A64

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ADDRESS

SIZE

MODULE

0xFFF7_FA00 - 0xFFF7_FAFF

256

GIO

0xFFF7_FD00 - 0xFFF7_FDFF

256

Timer

0xFFFF_FD00 - 0xFFFF_FDFF

256

MMC

0xFFFF_FE00 - 0xFFFF_FEFF

256

DEC

0xFFFF_FF20 - 0xFFFF_FF37

CIM

0xFFFF_FFD0 - 0xFFFF_FFEC

SYS

The registers and bit definitions inside the System and Peripheral blocks are detailed in the programmer’s

manuals.

9.5.2 Boot ROM

The device incorporates a 8 kB boot ROM. This boot ROM includes support for:

•

Program download through the PMBus

•

Device initialization

•

Examining and modifying registers and memory

•

Verifying and executing program flash automatically

•

Jumping to a customer defined boot program

•

Checksum evaluation to support using the program flash as a single 64 kB block or as 2-32 kB blocks.

The Boot ROM is entered automatically on device reset. It initializes the device and then performs checksums on

the program flash. If the first 2 kB of program FLASH 0 has a valid checksum, the program branches to location

0 in Program FLASH 0. This permits the use of a custom boot program. If the first checksum fails, it performs

some additional checksum calculations to determine where the valid program is located. This permits full

automated program memory checking, when there is no need for a custom boot program. The complete decision

tree is located in Figure 35. Additionally, the part can support two separate programs in block 0 and block 1

through a custom boot-flash routine.

Figure 35. Check Sum Evaluation Flowchart, 64 kB

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