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NAND02G-B2C датащи(PDF) 18 Page - STMicroelectronics |
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NAND02G-B2C датащи(HTML) 18 Page - STMicroelectronics |
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18 / 62 page ![]() Bus operations NAND01G-B2B, NAND02G-B2C 18/62 4.5 Write Protect Write Protect bus operations are used to protect the memory against program or erase operations. When the Write Protect signal is Low the device will not accept program or erase operations and so the contents of the memory array cannot be altered. The Write Protect signal is not latched by Write Enable to ensure protection even during power-up. 4.6 Standby When Chip Enable is High the memory enters Standby mode, the device is deselected, outputs are disabled and power consumption is reduced. Table 5. Bus Operations Bus Operation E AL CL R W WP I/O0 - I/O7 I/O8 - I/O15(1) 1. Only for x16 devices. Command Input VIL VIL VIH VIH Rising X(2) 2. WP must be VIH when issuing a program or erase command. Command X Address Input VIL VIH VIL VIH Rising X Address X Data Input VIL VIL VIL VIH Rising VIH Data Input Data Input Data Output VIL VIL VIL Fallin g VIH X Data Output Data Output Write Protect X X X X X VIL XX Standby VIH XX X X VIL/VD D XX Table 6. Address Insertion, x8 Devices Bus Cycle(1) 1. Any additional address input cycles will be ignored. I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 I/O0 1st A7 A6 A5 A4 A3 A2 A1 A0 2nd VIL VIL VIL VIL A11 A10 A9 A8 3rd A19 A18 A17 A16 A15 A14 A13 A12 4th A27 A26 A25 A24 A23 A22 A21 A20 5th(2) 2. The fifth cycle is valid for 2Gb devices. A28 is for 2Gb devices only. VIL VIL VIL VIL VIL VIL VIL A28 |
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