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STK16C88-WF45 Scheda tecnica(PDF) 10 Page - Simtek Corporation |
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STK16C88-WF45 Scheda tecnica(HTML) 10 Page - Simtek Corporation |
10 / 13 page 10 Jan, 2008 Document Control #ML0018 Rev 2.0 STK16C88 BEST PRACTICES nvSRAM products have been used effectively for over 15 years. While ease-of-use is one of the prod- uct’s main system values, experience gained work- ing with hundreds of applications has resulted in the following suggestions as best practices: • The non-volatile cells in an nvSRAM are pro- grammed on the test floor during final test and quality assurance. Incoming inspection routines at customer or contract manufacturer’s sites will sometimes reprogram these values. Final NV pat- terns are typically repeating patterns of AA, 55, 00, FF, A5, or 5A. End product’s firmware should not assume an NV array is in a set programmed state. Routines that check memory content val- ues to determine first time system configuration, cold or warm boot status, etc. should always pro- gram a unique NV pattern (e.g., complex 4-byte pattern of 46 E6 49 53 hex or more random bytes) as part of the final system manufacturing test to ensure these system routines work consis- tently. • Power up boot firmware routines should rewrite the nvSRAM into the desired state. While the nvSRAM is shipped in a preset state, best prac- tice is to again rewrite the nvSRAM into the desired state as a safeguard against events that might flip the bit inadvertently (program bugs, incoming inspection routines, etc.). |
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