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V29C31001T-70P Datasheet(PDF) 11 Page - Mosel Vitelic, Corp |
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V29C31001T-70P Datasheet(HTML) 11 Page - Mosel Vitelic, Corp |
11 / 16 page 11 V29C51001T/V29C51001B Rev. 0.8 October 2000 MOSEL VITELIC V29C51001T/V29C51001B Boot Block Protection The V29C51001T/V29C51001B features hardware Boot Block Protection. The boot block sector protection is enabled when high voltage (12.5V) is applied to OE and A9 pins with CE pin LOW and WE pin lOW. The sector protection is desabled when high voltage is applied to OE, CE and A9 pins with WE pin LOW. Other pins can be HIGH or LOW. This is shown in table 1. Autoselect The V29C51001T/V29C51001B features an Autoselect mode to identify the Boot Block (protected/unprotected), the Device (Top/Bottom), and the manufacturer ID. To get to the Autoselect mode, a high voltage (VH) must be applied to the A9 pin. Once the A9 signal is returned to LOW or HIGH, the device will return to the previous mode. Boot Block Protection Status In Autoselect mode, performing a read at address XXX2H will indicate if the Top Boot Block sector or the Bottom Boot Block sector is locked out. If the data is 01H, the Top/Bottom Boot Block is protected. If the data is 00H, the Top/Bottom Boot Block is unprotected. (see Table 3.) Device ID In Autoselect mode, performing a read at address XXX1H will determine whether the device is a Top Boot Block device or a Bottom Boot Block device. If the data is 01H, the device is a Top Boot Block. If the data is A1H, the device is a Bottom Boot Block device (see Table 3). In addition, the device ID can also be read via the command register when the device is erased or programmed in a system without applying high voltage to the A9 pin. When A0 is HIGH, the device ID is presented at the outputs. Manufacturer ID In Autoselect mode, performing a read at address. XXXX0H will determine the manufacturer ID. 40H is the manufacturer code for Mosel Vitelic Flash. In addition the manufacturer ID can also be read via the command register when the device is erased or programmed in a system without applying high voltage to the A9 pin. when A0 is LOW, the manufacturer ID is presented at the outputs. Hardware Data Protection VCC Sense Protection: the program operation is inhibited when VCC is less than 2.5V. Noise Protection: a CE or WE pulse of less than 5ns will not initiate a program cycle. Program Inhibit Protection: holding any one of OE LOW, CE HIGH or WE HIGH inhibits a program cycle. Table 3. Autoselect Decoding NOTE: 1. X = Don’t Care, VIH = HIGH, VIL = LOW. Decoding Mode Boot Block Address Data I/O0–I/O7 A0 A1 A2–A13 A14–A16 Boot Block Protection Top VIL VIH X X 01H: protected Bottom VIL VIH X X 00H: unprotected Device ID Top VIH VIL X X 01H Bottom A1H Manufacture ID VIL VIL X X 40H |
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