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TN1239
Technical note
How to change DCF STCU configuration
Introduction
The SPC58 family integrates a dedicated safety module to configure, control and execute
self-test operations. This module is called Self-Test Control Unit (STCU2).
The user can configure the STCU2 in two ways. The first way uses the standard register
access from user application. The second way exploits the Device Configuration Format
(DCF) records.
This document explains the correct procedure to update a STCU configuration which has
been already set by the specific DCF records in UTest memory. It focuses only on the
second way to configure the STCU.
As a prerequisite the reader should be familiar with the functionality of STCU2, DCF, SSCM
and UTest flash. For any details on these topics, refer to the reference manual.
September 2016
DocID029694 Rev 1
1/11
www.st.com
11
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Summary of Contents for ST PC58 Series
- Page 1 STCU. As a prerequisite the reader should be familiar with the functionality of STCU2, DCF, SSCM and UTest flash. For any details on these topics, refer to the reference manual. September 2016 DocID029694 Rev 1 1/11 www.st.com...
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Page 2: Table Of Contents
Contents TN1239 Contents Programming of STCU2 ........3 How STCU2 configuration can be updated . -
Page 3: Programming Of Stcu2
TN1239 Programming of STCU2 Programming of STCU2 The normal flow to program STCU2 starts by providing the unlock keys and afterwards the rest of the configuration (left side of Figure Unlock keys are static keys. The user can find their values in the STCU chapter of the reference manual. -
Page 4: How Stcu2 Configuration Can Be Updated
How STCU2 configuration can be updated TN1239 How STCU2 configuration can be updated As explained in the previous chapter, simply writing a second STCU configuration at different location does not cause any change in the configuration that the STCU loads, such as the first one. - Page 5 TN1239 How STCU2 configuration can be updated Table 1. Physical values of unlock and invalidation keys Key 1 Key 2 Complete DCF key 1 Complete DCF key 2 Unlock 0xD3FEA98B 0x2C015674 0xD3FEA98B00080008 0x2C01567400080008 Invalidation 0xD3BCA98B 0x28011674 0xD3BCA98B00080008 0x2801167400080008 DocID029694 Rev 1 5/11...
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Page 6: Limitation And Prerequisites
Limitation and prerequisites TN1239 Limitation and prerequisites These invalidation keys are effective only if unlock keys are aligned at 128 bits, otherwise the ECC must be computed explicitly for given data. The user adopts the invalidation keys only in case valid unlock keys are saved in UTest and a new configuration is applied. -
Page 7: Conclusion
TN1239 Conclusion Conclusion The update of STCU2 configuration is possible even if there are strict rules which the user must consider. If the user follows these rules this is no a risky operation. In addition, change of STCU2 configuration is an exceptional state which occurs mainly during developing phase and not in final application. -
Page 8: Reference Documents
Reference documents TN1239 Reference documents SPC58NE84C3, SPC58NE84E7, SPC58EG84C3 reference manuals, Rev2, Feb 2016 8/11 DocID029694 Rev 1... -
Page 9: Acronyms
TN1239 Acronyms Acronyms Table 2. Acronyms Acronym Name STCU2 Self-test control unit Device configuration format SSCM System status and configuration module DocID029694 Rev 1 9/11... -
Page 10: Revision History
Revision history TN1239 Revision history Table 3. Document revision history Date Revision Changes 26-Sept-2016 Initial release 10/11 DocID029694 Rev 1... - Page 11 ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
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