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M27C4002-12J1TR Datenblatt(PDF) 9 Page - STMicroelectronics |
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M27C4002-12J1TR Datenblatt(HTML) 9 Page - STMicroelectronics |
9 / 18 page 9/18 M27C4002 PRESTO II Programming Algorithm PRESTO II Programming Algorithm allows the whole array to be programmed with a guaranteed margin, in a typical time of 26.5 seconds. Pro- gramming with PRESTO II consists of applying a sequence of 100µs program pulses to each byte until a correct verify occurs (see Figure 7). During programming and verify operation, a MARGIN MODE circuit is automatically activated in order to guarantee that each cell is programmed with enough margin. No overprogram pulse is applied since the verify in MARGIN MODE provides nec- essary margin to each programmed cell. Program Inhibit Programming of multiple M27C4002s in parallel with different data is also easily accomplished. Ex- cept for E, all like inputs including G of the parallel M27C4002 may be common. A TTL low level pulse applied to a M27C4002's E input, with VPP at 12.75V, will program that M27C4002. A high level E input inhibits the other M27C4002s from being programmed. 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 G at VIL,E at VIH,VPP at 12.75V and VCC at 6.25V. Figure 6. Programming and Verify Modes AC Waveforms tAVEL VALID AI00730 A0-A17 Q0-Q15 VPP VCC G DATA IN DATA OUT E tQVEL tVPHEL tVCHEL tEHQX tELEH tGLQV tQXGL tGHQZ tGHAX PROGRAM VERIFY Figure 7. Programming Flowchart AI00726C n = 0 Last Addr VERIFY E = 100 µs Pulse ++n = 25 ++ Addr VCC = 6.25V, VPP = 12.75V FAIL CHECK ALL WORDS 1st: VCC = 6V 2nd: VCC = 4.2V YES NO YES NO YES NO |
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