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UCD3138128 Datasheet(PDF) 54 Page - Texas Instruments |
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UCD3138128 Datasheet(HTML) 54 Page - Texas Instruments |
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54 / 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? BRANCH to Program Flash 0 Stay in ROM Yes No Yes No Device Reset UCD3138128, UCD3138A64 SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014 www.ti.com 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 23 CIM 0xFFFF_FFD0 - 0xFFFF_FFEC 28 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 54 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: UCD3138128 UCD3138A64 |
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