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M27W800-100F6TR Fiches technique(PDF) 9 Page - STMicroelectronics |
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M27W800-100F6TR Fiches technique(HTML) 9 Page - STMicroelectronics |
9 / 15 page 9/15 M27W800 PRESTO III Programming Algorithm The PRESTO III Programming Algorithm allows the whole array to be programed with a guaran- teed margin in a typical time of 26 seconds. Pro- gramming with PRESTO III consists of applying a sequence of 50µs program pulses to each word until a correct verify occurs (see Figure 9). During programing and verify operation a MARGIN MODE circuit is automatically activated to guaran- tee that each cell is programed with enough mar- gin. No overprogram pulse is applied since the verify in MARGIN MODE at VCC much higher than 3.6V provides the necessary margin to each pro- grammed cell. Program Inhibit Programming of multiple M27W800s in parallel with different data is also easily accomplished. Ex- cept for E, all like inputs including G of the parallel M27W800 may be common. A TTL low level pulse applied to a M27W800's E input and VPP at 12.5V, will program that M27W800. A high level E input inhibits the other M27W800s from being pro- grammed. Program Verify A verify (read) should be performed on the pro- grammed bits to determine that they were correct- ly programmed. The verify is accomplished with E at VIH and G at VIL, VPP at 12.5V and VCC at 6.25V. Figure 8. Programming and Verify Modes AC Waveforms tAVEL VALID AI01599 A0-A18 Q0-Q15 BYTEVPP VCC G DATA IN DATA OUT E tQVEL tVPHAV tVCHAV tEHQX tELEH tGLQV tQXGL tGHQZ tGHAX PROGRAM VERIFY Figure 9. Programming Flowchart AI03600 n = 0 Last Addr VERIFY E = 50 µs Pulse ++n = 25 ++ Addr VCC = 6.25V, VPP = 12.5V FAIL CHECK ALL WORDS BYTEVPP =VIH 1st: VCC = 5V 2nd: VCC = 2.7V YES NO YES NO YES NO |
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