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10 / 19 page M27C160 10/19 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 52.5 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 11). 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 provides the necessary margin to each programmed cell. Program Inhibit Programming of multiple M27C160s in parallel with different data is also easily accomplished. Ex- cept for E, all like inputs including G of the parallel M27C160 may be common. A TTL low level pulse applied to a M27C160's E input and VPP at 12.5V, will program that M27C160. A high level E input in- hibits the other M27C160s 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 10. Programming and Verify Modes AC Waveforms tAVEL VALID AI00744 A0-A19 Q0-Q15 BYTEVPP VCC G DATA IN DATA OUT E tQVEL tVPHAV tVCHAV tEHQX tELEH tGLQV tQXGL tGHQZ tGHAX PROGRAM VERIFY Figure 11. Programming Flowchart AI01044B 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 = 4.2V YES NO YES NO YES NO |
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