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M27V800-120B1TR Fiches technique(PDF) 9 Page - STMicroelectronics |
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M27V800-120B1TR Fiches technique(HTML) 9 Page - STMicroelectronics |
9 / 16 page 9/16 M27V800 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 50 µs 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 neccessary margin to each pro- grammed cell. Program Inhibit Programming of multiple M27V800s in parallel with different data is also easily accomplished. Ex- cept for E, all like inputs including G of the parallel M27V800 may be common. A TTL low level pulse applied to a M27V800’s E input and VPP at 12.5V, will program that M27V800. A high level E input in- hibits the other M27V800s 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 AI00901 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 =6V 2nd: VCC = 3.3V YES NO YES NO YES NO |
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