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MX26L1620TC-90 Datasheet(PDF) 9 Page - Macronix International |
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MX26L1620TC-90 Datasheet(HTML) 9 Page - Macronix International |
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9 / 36 page  9 P/N:PM0827 REV. 0.4, JAN. 31, 2002 MX26L1620 sion has the secured sector Indicator Bit permanently set to a "0". Therefore, the Secured Silicon Sector Indi- cator Bit permanently set to a "0".Therefore, the Second Silicon Sector Indicator Bit prevents customer, lockable device from being used to replace devices that are fac- tory locked. The system access the Secured Silicon Sector through a command sequence (refer to "Enter Secured Silicon/ Exit Secured Silicon Sector command Sequence). After the system has written the Enter Secured Silicon Sector command sequence, it may read the Secured Silicon Sector by using the address normally occupied by the address 000000h-0001FFh.This mode of operation con- tinues until the system issues the Exit Secured Silicon Sector command sequence, or until power is removed from the device. On power-up, or following a hardware reset, the device reverts to sending command to ad- dress 000000h-0001FFFh. LOW VCC WRITE INHIBIT When VCC is less than VLKO the device does not ac- cept any write cycles. This protects dataduring VCC power-up and power-down. The command register and all internal program/erase circuits are disabled, and the device resets. Subsequent writes are ignored until VCC is greater thanVLKO. The system must provide the proper signals to the control pins to prevent unintentional write when VCC is greater than VLKO. WRITE PULSE "GLITCH" PROTECTION Noise pulses of less than 5ns(typical) on CE or WE will not initiate a write cycle. LOGICAL INHIBIT Writing is inhibited by holding any one of OE = VIL, CE = VIH or WE = VIH. To initiate a write cycle CE and WE must be a logical zero while OE is a logical one. POWER-UP SEQUENCE The MX26L1620 powers up in the Read only mode. In addition, the memory contents may only be altered after successful completion of the predefined command se- quences. FACTORY LOCKED:Secured Silicon Sector Programmed and Protected At the Factory In device with an ESN, the Secured Silicon Sector is protected when the device is shipped from the factory. The Secured Silicon Sector cannot be modified in any way. A factory locked device has an 8-word random ESN at address 000000h-000007h. CUSTOMER LOCKABLE:Secured Silicon Sector NOT Programmed or Protected At the Factory As an alternative to the factory-locked version, the device may be ordered such that the customer may program and protect the 512-word Secured Silicon Sector. Programming and protecting the Secured Silicon Sector must be used with caution since, once protected, there is no procedure available for unprotecting the Secured Silicon Sector area and none of the bits in the Secured Silicon Sector memory space can be modified in any way. The Secured Silicon Sector area can be protected using the following procedures: Write the three-cycle Enter Secured Silicon Sector Region command sequence. This allows in-system protection of the Secured Silicon Sector without raising any device pin to a high voltage. Note that method is only applicable to the Secured Silicon Sector. Once the Secured Silicon Sector is programmed, locked and verified, the system must write the Exit Secured Silicon Sector Region command sequence to return to reading and writing the remainder of the array. |
Similar Part No. - MX26L1620TC-90 |
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Similar Description - MX26L1620TC-90 |
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