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S29GL01GT13TFNyyxx Fiches technique(PDF) 15 Page - Cypress Semiconductor |
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S29GL01GT13TFNyyxx Fiches technique(HTML) 15 Page - Cypress Semiconductor |
15 / 105 page Document Number: 002-00247 Rev. *G Page 15 of 105 S29GL01GT, S29GL512T 3.4.6 Sector Protection States Summary Each sector can be in one of the following protection states: Unlocked – The sector is unprotected and protection can be changed by a simple command. The protection state defaults to unprotected after a power cycle or hardware reset. Dynamically Locked – A sector is protected and protection can be changed by a simple command. The protection state is not saved across a power cycle or hardware reset. Persistently Locked – A sector is protected and protection can only be changed if the PPB Lock Bit is set to 1. The protection state is non-volatile and saved across a power cycle or hardware reset. Changing the protection state requires programming or erase of the PPB bits. 3.4.7 Lock Register The Lock Register holds the non-volatile OTP bits for controlling protection of the SSR and determining the PPB Lock bit management method (protection mode). The Secure Silicon Region (SSR) protection bits must be used with caution, as once locked, there is no procedure available for unlocking the protected portion of the Secure Silicon Region and none of the bits in the protected Secure Silicon Region memory space can be modified in any way. Once the Secure Silicon Region area is protected, any further attempts to program in the area will fail with status indicating the area being programmed is protected. The Region 0 Indicator Bit is located in the Lock Register at bit location 0, Region 1 in bit location 6, Region 2 in bit location 9, and Region 3 in bit location 10. Table 3.1 Sector Protection States Protection Bit Values Sector State PPB Lock PPB DYB 1 1 1 Unprotected – PPB and DYB are changeable 1 1 0 Protected – PPB and DYB are changeable 1 0 1 Protected – PPB and DYB are changeable 1 0 0 Protected – PPB and DYB are changeable 0 1 1 Unprotected – PPB not changeable, DYB is changeable 0 1 0 Protected – PPB not changeable, DYB is changeable 0 0 1 Protected – PPB not changeable, DYB is changeable 0 0 0 Protected – PPB not changeable, DYB is changeable Table 3.2 Lock Register Bit Default Value Name 15-12 1 Reserved 11 1 SSR Region 3 Password Protection Mode Lock Bit 10 1 SSR Region 3 (Customer) Lock Bit 9 1 SSR Region 2 (Customer) Lock Bit 80 Reserved 7 1 Reserved 6 1 SSR Region 1 (Customer) Lock Bit 51 Reserved 41 Reserved 31 Reserved 2 1 Password Protection Mode Lock Bit 1 1 Persistent Protection Mode Lock Bit 0 0 SSR Region 0 (Factory) Lock Bit |
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