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M27C801-60N1TR Fiches technique(PDF) 9 Page - STMicroelectronics |
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M27C801-60N1TR Fiches technique(HTML) 9 Page - STMicroelectronics |
9 / 16 page 9/16 M27C801 PRESTO IIB Programming Algorithm PRESTO IIB Programming Algorithm allows the whole array to be programmed with a guaranteed margin, in a typical time of 52.5 seconds. This can be achieved with STMicroelectronics M27C801 due to several design innovations to improve pro- gramming efficiency and to provide adequate mar- gin for reliability. Before starting the programming the internal MARGIN MODE circuit is set in order to guarantee that each cell is programmed with enough margin. Then a sequence of 50µs pro- gram pulses are applied to each byte until a cor- rect verify occurs. No overprogram pulses are applied since the verify in MARGIN MODE pro- vides the necessary margin. Program Inhibit Programming of multiple M27C801s in parallel with different data is also easily accomplished. Ex- cept for E, all like inputs including GVPP of the par- allel M27C801 may be common. A TTL low level pulse applied to a M27C801's E input, with VPP at 12.75V, will program that M27C801. A high level E input inhibits the other M27C801s 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 G at VIL. Data should be verified with tELQV after the falling edge of E. Figure 8. Programming Flowchart AI01271B n = 0 Last Addr VERIFY E = 50 µs Pulse ++n = 25 ++ Addr VCC = 6.25V, VPP = 12.75V FAIL CHECK ALL BYTES 1st: VCC = 6V 2nd: VCC = 4.2V YES NO YES NO YES NO SET MARGIN MODE RESET MARGIN MODE Figure 7. Programming and Verify Modes AC Waveforms tAVEL VALID AI01270 A0-A19 Q0-Q7 VCC DATA IN DATA OUT E tQVEL tVCHEL tVPHEL tEHQX tEHVPX tELQV tELEH tEHQZ tVPLEL PROGRAM VERIFY GVPP tEHAX |
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