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EN29GL064AT Datasheet(PDF) 27 Page - Eon Silicon Solution Inc. |
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EN29GL064AT Datasheet(HTML) 27 Page - Eon Silicon Solution Inc. |
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27 / 58 page 
This Data Sheet may be revised by subsequent versions ©2004 Eon Silicon Solution, Inc., www.eonssi.com or modifications due to changes in technical specifications. 27 EN29GL064AT/B Rev. B, Issue Date: 2011/04/12 DQ3 outputs a ‘0’, when the lock register bits are read. Similarly, if the device is programmed to enable all PPB erase command, DQ3 outputs a ‘1’ when the lock register bits are read. Likewise the DQ4 bit is also programmed in the EON Factory. DQ4 is the bit which indicates whether Volatile Sector Protection Bit (DYB) is protected or not after boot-up. When the device is programmed to set all Volatile Sector Protection Bit protected after power-up, DQ4 outputs a ‘0’ when the lock register bits are read. Similarly, when the device is programmed to set all Volatile Sector Protection Bit unprotected after power-up, DQ4 outputs a ‘1’. Each of these bits in the lock register are non-volatile. DQ15- DQ5 are reserved and will be 1’s. Table 6. Lock Register DQ15-5 DQ4 DQ3 DQ2 DQ1 DQ0 Reserved DYB Lock Boot Bit PPB One Time Programmable Bit Reserved Persistent Protection Mode Lock Bit Secured Silicon Sector Protection Bit (default = 1) 0 = protected all DYB after boot-up 1 = unprotected all DYB after boot-up (default = 1) 0 = All PPB Erase Command disabled 1 = All PPB Erase Command enabled (default = 1) (default = 1) 0 = Persistent Protection enabled (default = 0) 0 = protected 1 = unprotect (default = 1) Notes: 1. After the Lock Register Bits Command Set Entry command sequence is written, reads and writes for Sector 0 are disabled, while read from other sectors are allowed until exiting this mode. 2. Only DQ0 could be change by Lock Register Bits Command for user. Others bits were set by Factory. After selecting a sector protection method, each sector can operate in any of the following three states: 1. Constantly locked: The selected sectors are protected and can not be reprogrammed unless PPB lock bit is cleared via hardware reset, or power cycle. 2. Dynamically locked: The selected sectors are protected and can be altered via software commands. 3. Unlocked: The sectors are unprotected and can be erased and/or programmed. Persistent Protection Bits The Persistent Protection Bits are unique and nonvolatile. For top boot sector device, Sector 0~123 are 1 PPB per 4 sectors and Sector 124~134 have PPB for each boot sector. For bottom boot sector device, Sector 0~10 have PPB for each boot sector and Sector 11~134 are 1 PPB per 4 sectors(refer to Figure 8a, 8b and Table 3a, 3b). The PPB has the same endurances as the Flash memory. Preprogramming and verification prior to erasure are handled by the device, and therefore do not require system monitoring. Notes 1. Each PPB is individually programmed and all are erased in parallel. 2. While programming PPB for the four sectors and Data polling on programming PPB address, array data can not be read from any sectors. 3. Entry command disables reads and writes for all sectors selected. 4. Reads within that sector return the PPB status for that sector. 5. All Reads must be performed using the read mode. 6. The specific sector address are written at the same time as the program command. 7. If the PPB Lock Bit is set, the PPB Program or erase command does not execute and times-out without programming or erasing the PPB. 8. There are no means for individually erasing a specific PPB and no specific sector address is required for this operation. 9. Exit command must be issued after the execution which resets the device to read mode and re- enables reads and writes for all sectors. 10. The programming state of the PPB for given sectors can be verified by writing a PPB Status Read Command to the device as described by the flow chart shown in Figure 9. User only can use DQ6 and RY/BY# pin to detect programming status. |
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