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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STK11C88-SF45I датащи(PDF) 11 Page - Simtek Corporation |
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STK11C88-SF45I датащи(HTML) 11 Page - Simtek Corporation |
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11 / 16 page  11 STK11C88 Jan, 2008 Document Control #ML0012 Rev 2.0 BEST PRACTICES nvSRAM products have been used effectively for over 15 years. While ease-of-use is one of the product’s main system values, experience gained working 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 patterns 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 pro- grammed state. Routines that check memory content values to determine first time system configuration, cold or warm boot status, etc. should always program 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 sys- tem manufacturing test to ensure these system routines work consistently. • 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.). |
Аналогичный номер детали - STK11C88-SF45I |
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Аналогичное описание - STK11C88-SF45I |
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