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EN29F800B70TI Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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EN29F800B70TI Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 38 page 4800 Great America Parkway, Suite 202 Tel: 408-235-8680 Santa Clara, CA 95054 Fax: 408-235-8685 11 EN29F800 Rev. E, Issue Date: 2001/07/05 Reset Command Writing the reset command to the device resets the device to reading array data. Address bits are don’t- care for this command. The reset command may be written between the sequence cycles in an erase command sequence before erasing begins. This resets the device to reading array data. Once erasure begins, however, the device ignores reset commands until the operation is complete. The reset command may be written between the sequence cycles in a program command sequence before programming begins. This resets the device to reading array data (also applies to programming in Erase Suspend mode). Once programming begins, however, the device ignores reset commands until the operation is complete. The reset command may be written between the sequence cycles in an autoselect command sequence. Once in the autoselect mode, the reset command must be written to return to reading array data (also applies to autoselect during Erase Suspend). If DQ5 goes high during a program or erase operation, writing the reset command returns the device to reading array data (also applies during Erase Suspend). Autoselect Command Sequence The autoselect command sequence allows the host system to access the manufacturer and devices codes, and determine whether or not a sector is protected. The Command Definitions table shows the address and data requirements. This is an alternative method which is intended for PROM programmers and requires VID on address bit A9. Two unlock cycles followed by the autoselect command initiate the autoselect command sequence. Autoselect mode is then entered and the system may read at any address any number of times, without needing another command sequence. The system must write the reset command to exit the autoselect mode and return to reading array data. Word / Byte Programming Command The device may be programmed by byte or by word, depending on the state of the Byte# Pin. Programming the EN29F800 is performed by using a four bus-cycle operation (two unlock write cycles followed by the Program Setup command and Program Data Write cycle). When the program command is executed, no additional CPU controls or timings are necessary. An internal timer terminates the program operation automatically. Address is latched on the falling edge of CE or WE , whichever is last; data is latched on the rising edge of CE or WE , whichever is first. Programming status may be checked by sampling data on DQ7 (DATA polling) or on DQ6 (toggle bit). When the program operation is successfully completed, the device returns to read mode and the user can read the data programmed to the device at that address. Note that data can not be programmed from a 0 to a 1. Only an erase operation can change a data from 0 to 1. When programming time limit is exceeded, DQ5 will produce a logical “1” and a Reset command can return the device to Read mode. Chip Erase Command Chip erase is a six-bus-cycle operation. The chip erase command sequence is initiated by writing two unlock cycles, followed by a set-up command. Two additional unlock write cycles are then followed by the chip erase command, which in turn invokes the Embedded Erase algorithm. The device does not require the system to preprogram prior to erase. The Embedded Erase algorithm automatically preprograms and verifies the entire memory for an all zero data pattern prior to electrical erase. The system is not required to provide any controls or timings during these operations. The Command Definitions table shows the address and data requirements for the chip erase command sequence. |
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