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28F008C3 Datasheet(PDF) 22 Page - Intel Corporation |
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28F008C3 Datasheet(HTML) 22 Page - Intel Corporation |
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22 / 59 page  3 VOLT ADVANCED+ BOOT BLOCK E 22 PRODUCT PREVIEW Any attempt to address Protection Program commands outside the defined protection register address space will result in a Status Register error (Program Error bit SR.4 will be set to 1). Attempting to program or to a previously locked protection register segment will result in a status register error (program error bit SR.4 and lock error bit SR.1 will be set to 1). 3.4.3 LOCKING THE PROTECTION REGISTER The user-programmable segment of the protection register is lockable by programming Bit 1 of the PR-LOCK location to 0. Bit 0 of this location is programmed to 0 at the Intel factory to protect the unique device number. This bit is set using the Protection Program command to program “FFFD” to the PR-LOCK location. After these bits have been programmed, no further changes can be made to the values stored in the protection register. Protection Program commands to a locked section will result in a status register error (Program Error bit SR.4 and Lock Error bit SR.1 will be set to 1). Protection register lockout state is not reversible. 4 Words Factory Programmed 4 Words User Programmed 1 Word Lock 88H 85H 84H 81H 80H 0645_05 Figure 5. Protection Register Memory Map 3.5 VPP Program and Erase Voltages Intel’s 3 Volt Advanced+ Boot Block products provide in-system writes plus a VPP pin for 12 V production programming and complete write protection. 3.5.1 EASY-12 V OPERATION FOR FAST MANUFACTURING PROGRAMMING Intel’s 3 Volt Advanced+ Boot Block products provide in-system programming and erase in the 2.7 V–3.6 V range. For fast production programming, 3 Volt Advanced+ Boot Block includes a low-cost, backward-compatible 12 V programming feature. When VPP is between 1.65 V and 3.6 V, all program and erase current is drawn through the VCC pin. Note that if VPP is driven by a logic signal, VIH = 1.65 V. That is, VPP must remain above 1.65 V to perform in-system flash modifications. When VPP is connected to a 12 V power supply, the device draws program and erase current directly from the VPP pin. This eliminates the need for an external switching transistor to control the voltage VPP. Figure 6 shows examples of how the flash power supplies can be configured for various usage models. The 12 V VPP mode enhances programming performance during the short period of time typically found in manufacturing processes; however, it is not intended for extended use. 12 V may be applied to VPP during program and erase operations for a maximum of 1000 cycles on the main blocks and 2500 cycles on the parameter blocks. VPP may be connected to 12 V for a total of 80 hours maximum. Stressing the device beyond these limits may cause permanent damage. 3.5.2 VPP ≤ VPPLK FOR COMPLETE PROTECTION In addition to the flexible block locking, the VPP programming voltage can be held low for absolute hardware write protection of all blocks in the flash device. When VPP is below VPPLK, any program or erase operation will result in a error, prompting the corresponding status register bit (SR.3) to be set. 3.5.3 VPP USAGE The VPP pin is used for two functions: Absolute data protection and fast production programming. When VPP ≤ VPPLK, then all program or erase operations to the device are inhibited, providing absolute data protection. |
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