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S29GL01GT11FHAyyx Fiches technique(PDF) 12 Page - Cypress Semiconductor |
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S29GL01GT11FHAyyx Fiches technique(HTML) 12 Page - Cypress Semiconductor |
12 / 105 page Document Number: 002-00247 Rev. *G Page 12 of 105 S29GL01GT, S29GL512T 3. Data Protection The device offers several features to prevent malicious or accidental modification of any sector via hardware means. 3.1 Device Protection Methods 3.1.1 Power-Up Write Inhibit RESET#, CE#, WE#, and, OE# are ignored during Power-On Reset (POR). During POR, the device can not be selected, will not accept commands on the rising edge of WE#, and does not drive outputs. The Host Interface Controller (HIC) and Embedded Algorithm Controller (EAC) are reset to their standby states, ready for reading array data, during POR. CE# or OE# must go to VIH before the end of POR (tVCS). At the end of POR the device conditions are: all internal configuration information is loaded, the device is in read mode, the Status Register is at default value, all bits in the DYB ASO are set to un-protect all sectors, the Write Buffer is loaded with all 1’s, the EAC is in the standby state. 3.1.2 Low VCC Write Inhibit When VCC is less than VLKO, the HIC does not accept any write cycles and the EAC resets. This protects data during VCC power-up and power-down. The system must provide the proper signals to the control pins to prevent unintentional writes when VCC is greater than VLKO. 3.2 Command Protection Embedded Algorithms are initiated by writing command sequences into the EAC command memory. The command memory array is not readable by the host system and has no ASO. Each host interface write is a command or part of a command sequence to the device. The EAC examines the address and data in each write transfer to determine if the write is part of a legal command sequence. When a legal command sequence is complete the EAC will initiate the appropriate EA. Writing incorrect address or data values, or writing them in an improper sequence, will generally result in the EAC returning to its Standby state. However, such an improper command sequence may place the device in an unknown state, in which case the system must write the reset command, or possibly provide a hardware reset by driving the RESET# signal Low, to return the EAC to its Standby state, ready for random read. The address provided in each write may contain a bit pattern used to help identify the write as a command to the device. The upper portion of the address may also select the sector address on which the command operation is to be performed. The Sector Address (SA) includes Amax through A16 flash address bits (system byte address signals Amax through A16). A command bit pattern is located in A10 to A0 flash address bits (system byte address signals A11 through A1). The data in each write may be: a bit pattern used to help identify the write as a command, a code that identifies the command operation to be performed, or supply information needed to perform the operation. See Table 7.1 on page 48 for a listing of all commands accepted by the device. 3.3 Secure Silicon Region (OTP) See Section 2.5, Secure Silicon Region ASO on page 9 for a description of the secure silicon region. See Section 5.4.9.3, Secure Silicon Region ASO on page 33 for a description of the allowed commands. |
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