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M58WT032KB Datasheet(PDF) 38 Page - Numonyx B.V |
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M58WT032KB Datasheet(HTML) 38 Page - Numonyx B.V |
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38 / 117 page  Status Register M58WTxxxKT, M58WTxxxKB 38/117 7.5 VPP status bit (SR3) The VPP status bit identifies an invalid voltage on the VPP pin during program and erase operations. The VPP pin is only sampled at the beginning of a program or erase operation. Indeterminate results can occur if VPP becomes invalid during an operation. When the VPP status bit is Low (set to ‘0’), the voltage on the VPP pin was sampled at a valid voltage. When the VPP status bit is High (set to ‘1’), the VPP pin has a voltage that is below the VPP lockout voltage, VPPLK, the memory is protected and program and erase operations cannot be performed. Once set High, the VPP status bit can only be reset Low by a Clear Status Register command or a hardware reset. If set High it should be reset before a new program or erase command is issued, otherwise the new command appears to fail. 7.6 Program suspend status bit (SR2) The program suspend status bit indicates that a program operation has been suspended in the addressed block. When the program suspend status bit is High (set to ‘1’), a Program/Erase Suspend command has been issued and the memory is waiting for a Program/Erase Resume command. The program suspend status should only be considered valid when the Program/Erase Controller status bit is High (Program/Erase Controller inactive). SR2 is set within the program suspend latency time of the Program/Erase Suspend command being issued, therefore, the memory may still complete the operation rather than entering the suspend mode. When a Program/Erase Resume command is issued, the program suspend status bit returns Low. 7.7 Block protection status bit (SR1) The block protection status bit can be used to identify if a program or block erase operation has tried to modify the contents of a locked or locked-down block. When the block protection status bit is High (set to ‘1’), a program or erase operation has been attempted on a locked or locked-down block. Once set High, the block protection status bit can only be reset Low by a Clear Status Register command or a hardware reset. If set High it should be reset before a new command is issued, otherwise the new command appears to fail. |
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