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M27W512 Datasheet(PDF) 10 Page - STMicroelectronics |
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M27W512 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 22 page Device operation M27W512 10/22 2.6 PRESTO IIB programming algorithm PRESTO IIB programming algorithm allows the whole array to be programmed with a guaranteed margin, in a typical time of 6.5 seconds. This can be achieved with STMicroelectronics M27W512 due to several design innovations described in the M27W512 datasheet to improve programming efficiency and to provide adequate margin for reliability. Before starting the programming the internal MARGIN MODE circuit must be set in order to guarantee that each cell is programmed with enough margin. Then a sequence of 100µs program pulses is applied to each byte until a correct verify occurs (see Figure 3). No overprogram pulses are applied since the verify in MARGIN MODE at VCC much higher than 3.6V, provides the necessary margin. 2.7 Program inhibit Programming of multiple devices in parallel with different data is also easily accomplished. Except for E, all like inputs including GVPP of the parallel M27W512 may be common. A TTL low level pulse applied to a M27W512 E input, with VPP at 12.75V, will program this device. A high level E input inhibits the other M27W512 from being programmed. 2.8 Program verify A verify (read) should be performed on the programmed bits to determine that they were correctly programmed. The verify is accomplished with G at VIL. Data should be verified with tELQV after the falling edge of E. 2.9 Electronic signature The Electronic Signature (ES) mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and type. This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C ambient temperature range that is required when programming the M27W512. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27W512. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH. All other address lines must be held at VIL during Electronic Signature mode. Byte 0 (A0 = VIL) represents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27W512, these two identifier bytes are given in Table 3 and can be read-out on outputs Q7 to Q0. Note that the M27W512 and M27C512 have the same identifier byte. |
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