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W19B160TBAH7H Datasheet(PDF) 11 Page - Winbond |
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W19B160TBAH7H Datasheet(HTML) 11 Page - Winbond |
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11 / 48 page  W19B160BT/B DATA SHEET Publication Release Date:Jan.04, 2008 - 11 - Revision A5 To access the auto select codes in-system, the host system can issue the auto select command through the command register. This method does not require VID. Also refer to the auto select Command Sequence section for more information. 6.1.10 Sector Protection and Un-protection The sector protection feature will disable both program and erase operations in any sectors. The sector un-protection feature will re-enables both program and erase operations in previously protected sectors. Sector protection / un-protection can be implemented through two methods. The primary method requires VID on the #RESET pin, and can be implemented either in-system or through programming equipment. This method uses standard microprocessor bus cycle timing. The alternate method intended only for programming equipment requires VID on address pin A9 and #OE It is possible to determine whether a sector is protected or unprotected. See the auto select Mode section for details. 6.1.11 Temporary Sector Unprotect This feature allows temporary un-protection of previously protected sectors to change data in-system. When the #RESET pin is set to VID, the Sector Unprotect mode is activated. During this mode, formerly protected sectors can be programmed or erased by selecting the sector addresses. What if VID is removed from the #RESET pin, all the previously protected sectors are protected again. 6.1.12 Hardware Data Protection The command sequence requirements of unlock cycles for programming or erasing provides data protection against negligent writes. In addition, the following hardware data protection measures prevent inadvertent erasure or programming, which might be caused by spurious system level signals during VDD power-up and power-down transitions, or from system noise. 6.1.13 Write Pulse “Glitch” Protection Noise pulses, which is less than 5nS (typical) on #OE, #CE or #WE, do not initiate a write cycle. 6.1.14 Logical Inhibit Write cycles are inhibited by holding any one of #OE = VIL, #CE = VIH or #WE = VIH. #CE and #WE must be a logical zero while #OE is a logical one to initiate a write cycle. 6.1.15 Power-Up Write Inhibit During power up, if #WE = #CE = VIL and #OE = VIH, the device does not accept commands on the rising edge of #WE. The internal state machine is automatically reset to the read mode on power-up. |
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