UCD3138064RGCR datasheet(58/104 Pages) TI

58 / 104 page

Address

Size

Module

0xFFFF_FF40 - 0xFFFF_FF50

PSA

0xFFFF_FFD0 - 0xFFFF_FFEC

SYS

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

for each peripheral.

9.5.1.2 Boot ROM

The UCD3138064 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 facilitate program execution from either Program Flash 1 or Program Flash 2

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 either program FLASH has a valid checksum, the program branches

to location 0 in the appropriate Program FLASH module. 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 9-28. "Branch to Program Flash 1" means Flash 1 is at

address 0x0000, and Flash 2 is at address 0x8000. "Branch to Program Flash 2" means Flash 2 is at address

0x0000, and Flash 1 is at address 0x8000.

UCD3138064

SLUSB72D – MARCH 2013 – REVISED APRIL 2021

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