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UCD3138064RMHT Datasheet(PDF) 57 Page - Texas Instruments |
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UCD3138064RMHT Datasheet(HTML) 57 Page - Texas Instruments |
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57 / 91 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 No Yes No Yes No Yes No Device Reset Yes No Is there a valid checksum on all 64 kB? UCD3138064 www.ti.com SLUSB72B – MARCH 2013 – REVISED SEPTEMBER 2014 Figure 6-28. 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. 6.5.1.3 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 6.5.1.4 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. Copyright © 2013–2014, Texas Instruments Incorporated Detailed Description 57 Submit Documentation Feedback Product Folder Links: UCD3138064 |
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