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S29AL032D Datasheet(PDF) 45 Page - SPANSION |
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S29AL032D Datasheet(HTML) 45 Page - SPANSION |
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45 / 69 page  June 13, 2005 S29AL032D_00_A3 S29AL032D 43 Ad vance Info rmat i o n Figure 7. Toggle Bit Algorithm DQ5: Exceeded Timing Limits DQ5 indicates whether the program or erase time has exceeded a specified internal pulse count limit. Under these conditions DQ5 produces a 1. This is a failure condition that indicates the pro- gram or erase cycle was not successfully completed. The DQ5 failure condition may appear if the system tries to program a 1 to a location that is pre- viously programmed to 0. Only an erase operation can change a 0 back to a 1. Under this START No Yes Yes DQ5 = 1? No Yes Toggle Bit = Toggle? No Program/Erase Operation Not Complete, Write Reset Command Program/Erase Operation Complete Read DQ7–DQ0 Toggle Bit = Toggle? Read DQ7–DQ0 Twice Read DQ7–DQ0 Notes: 1. Read toggle bit twice to determine whether or not it is toggling. See text. 2. Recheck toggle bit because it may stop toggling as DQ5 changes to 1. See text. (Note 1) (Notes 1,2) |
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