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AT49BV162A Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT49BV162A Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 29 page 8 AT49BV162/163A(T) 3349G–FLASH–7/04 nection allows for OR-tying of several devices to the same RDY/BUSY line. Please see “Status Bit Table” on page 11 for more details. CFI: Common Flash Interface (CFI) is a published, standardized data structure that may be read from a flash device. CFI allows system software to query the installed device to deter- mine the configurations, various electrical and timing parameters, and functions supported by the device. CFI is used to allow the system to learn how to interface to the flash device most optimally. The two primary benefits of using CFI are ease of upgrading and second source availability. The command to enter the CFI Query mode is a one-bus cycle command which requires writing data 98h to address 55h. The CFI Query command can be written when the device is ready to read data or can also be written when the part is in the product ID mode. Once in the CFI Query mode, the system can read CFI data at the addresses given in Table 1 on page 24. To exit the CFI Query mode, the product ID exit command must be given. HARDWARE DATA PROTECTION: The Hardware Data Protection feature protects against inadvertent programs to the AT49BV162A(T)/163A(T) in the following ways: (a) V CC sense: if V CC is below 1.8V (typical), the program function is inhibited. (b) VCC power-on delay: once V CC has reached the VCC sense level, the device will automatically time out 10 ms (typical) before programming. (c) Program inhibit: holding any one of OE low, CE high or WE high inhibits program cycles. (d) Program inhibit: V PP is less than VILPP. (e) VPP power-on delay: once V PP has reached 1.65V, program and erase operations are inhibited for 100 ns. INPUT LEVELS: While operating with a 2.65V to 3.6V power supply, the address inputs and control inputs (OE, CE and WE) may be driven from 0 to 5.5V without adversely affecting the operation of the device. The I/O lines can only be driven from 0 to V CC + 0.6V. |
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